{"id":12849,"date":"2026-02-04T22:11:29","date_gmt":"2026-02-04T14:11:29","guid":{"rendered":"https:\/\/aobosteel.com\/?page_id=12849"},"modified":"2026-09-15T17:30:44","modified_gmt":"2026-09-15T09:30:44","slug":"quench-cracking-tool-steel","status":"publish","type":"page","link":"https:\/\/aobosteel.com\/ko\/quench-cracking-tool-steel\/","title":{"rendered":"\uacf5\uad6c\uac15\uc758 \ub2f4\uae08\uc9c8 \uade0\uc5f4: \uc6d0\uc778, \uc608\ubc29 \ubc0f \ud574\uacb0\ucc45"},"content":{"rendered":"<div class=\"wp-block-uagb-container uagb-block-80c8f067 alignfull uagb-is-root-container\"><div class=\"uagb-container-inner-blocks-wrap\">\n<h1 class=\"wp-block-heading has-x-large-font-size\" id=\"h-quench-cracking-in-tool-steel-mechanisms-identification-and-prevention\">\uacf5\uad6c\uac15\uc758 \ub2f4\uae08\uc9c8 \uade0\uc5f4: \ubc1c\uc0dd \uae30\uc804, \uc2dd\ubcc4 \ubc0f \uc608\ubc29<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-what-is-quench-cracking\">\ub2f4\uae08\uc9c8 \uade0\uc5f4\uc774\ub780 \ubb34\uc5c7\uc778\uac00\uc694?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\ub2f4\uae08\uc9c8 \uade0\uc5f4\uc740 \ub2f4\uae08\uc9c8 \uc911 \ub610\ub294 \uc9c1\ud6c4\uc5d0 \ubc1c\uc0dd\ud558\ub294 \ud30c\uc190\uc785\ub2c8\ub2e4. \uade0\uc5f4\uc740 \uc77c\ubc18\uc801\uc73c\ub85c \ud45c\uba74\uc5d0\uc11c \uc2dc\uc791\ud558\uc5ec \uc138\ub85c \ubc29\ud5a5 \ub610\ub294 \ubc29\uc0ac \ubc29\ud5a5\uc73c\ub85c \uc548\ucabd\uc73c\ub85c \uc804\ud30c\ub429\ub2c8\ub2e4. \uc77c\ub2e8 \uade0\uc5f4\uc774 \ubc1c\uc0dd\ud558\uba74 \ubd80\ud488\uc740 \ubcf5\uad6c\ud560 \uc218 \uc5c6\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-why-quench-cracking-occurs\">\ub2f4\uae08\uc9c8 \uade0\uc5f4\uc774 \ubc1c\uc0dd\ud558\ub294 \uc774\uc720<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\ub2f4\uae08\uc9c8 \uade0\uc5f4\uc740 \ub0c9\uac01 \ubc0f \ubcc0\ud0dc \uacfc\uc815\uc5d0\uc11c \ubc1c\uc0dd\ud558\ub294 \ub0b4\ubd80 \uc751\ub825\uc774 \uacbd\ud654\ub41c \uad6c\uc870\ubb3c\uc758 \uc778\uc7a5 \uac15\ub3c4\ub97c \ucd08\uacfc\ud560 \ub54c \ubc1c\uc0dd\ud569\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ub2f4\uae08\uc9c8 \uacfc\uc815\uc5d0\uc11c \ud45c\uba74\uc740 \uba3c\uc800 \ub0c9\uac01\ub418\uace0 \uc218\ucd95\ud558\ub294 \ubc18\uba74 \uc911\uc2ec\ubd80\ub294 \uc5ec\uc804\ud788 \ub728\uac70\uc6b4 \uc0c1\ud0dc\ub97c \uc720\uc9c0\ud558\uc5ec \ub2e8\uba74 \uc804\uccb4\uc5d0 \uac78\uccd0 \uc628\ub3c4 \uad6c\ubc30\uac00 \ubc1c\uc0dd\ud558\uace0 \uae30\uacc4\uc801 \uc751\ub825\uc774 \uc720\ubc1c\ub429\ub2c8\ub2e4. \ub3d9\uc2dc\uc5d0 \uc624\uc2a4\ud14c\ub098\uc774\ud2b8\uac00 \ub9c8\ub974\ud150\uc0ac\uc774\ud2b8\ub85c \ubcc0\ud0dc\ud558\uba74\uc11c \ubd80\ud53c \ud33d\ucc3d\uc774 \uc77c\uc5b4\ub0a9\ub2c8\ub2e4. \ud45c\uba74\uc774 \uba3c\uc800 \ubcc0\ud0dc\ub418\uae30 \ub54c\ubb38\uc5d0 \uc911\uc2ec\ubd80\uac00 \uc5ec\uc804\ud788 \uc5f0\uc131\uc744 \uc720\uc9c0\ud558\uace0 \ubcc0\ud615\uc744 \uc218\uc6a9\ud560 \uc218 \uc788\ub294 \ub3d9\uc548 \ud33d\ucc3d\ud558\uac8c \ub429\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ub0c9\uac01\uc774 \uacc4\uc18d\ub428\uc5d0 \ub530\ub77c \uc911\uc2ec\ubd80\ub294 \ubcc0\ud0dc \uc628\ub3c4\uc5d0 \ub3c4\ub2ec\ud558\uc5ec \ud33d\ucc3d\ud558\uae30 \uc2dc\uc791\ud569\ub2c8\ub2e4. \uc774 \ub2e8\uacc4\uc5d0\uc11c \ud45c\uba74\uc740 \uc774\ubbf8 \ub2e8\ub2e8\ud55c \ub9c8\ub974\ud150\uc0ac\uc774\ud2b8\ub85c \ubcc0\ud0dc\ub418\uc5b4 \uc18c\uc131 \ubcc0\ud615\uc774 \ubd88\uac00\ub2a5\ud569\ub2c8\ub2e4. \ud33d\ucc3d\ud558\ub294 \uc911\uc2ec\ubd80\ub294 \ud45c\uba74\uc5d0 \uc778\uc7a5 \uc751\ub825\uc744 \uac00\ud569\ub2c8\ub2e4. \uc774 \uc751\ub825\uc774 \uc7ac\ub8cc\uc758 \uad6d\ubd80\uc801\uc778 \uac15\ub3c4\ub97c \ucd08\uacfc\ud558\uba74 \ud45c\uba74\uc5d0\uc11c \uade0\uc5f4\uc774 \ubc1c\uc0dd\ud558\uc5ec \ub0b4\ubd80\ub85c \uc804\ud30c\ub429\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ub0c9\uac01\uc774 \uacc4\uc18d\ub428\uc5d0 \ub530\ub77c \uc911\uc2ec\ubd80\ub294 \ubcc0\ud0dc \uc628\ub3c4\uc5d0 \ub3c4\ub2ec\ud558\uc5ec \ud33d\ucc3d\ud558\uae30 \uc2dc\uc791\ud569\ub2c8\ub2e4. \uc774 \ub2e8\uacc4\uc5d0\uc11c \ud45c\uba74\uc740 \uc774\ubbf8 \ub2e8\ub2e8\ud55c \ub9c8\ub974\ud150\uc0ac\uc774\ud2b8\ub85c \ubcc0\ud0dc\ub418\uc5b4 \uc18c\uc131 \ubcc0\ud615\uc774 \ubd88\uac00\ub2a5\ud569\ub2c8\ub2e4. \ud33d\ucc3d\ud558\ub294 \uc911\uc2ec\ubd80\ub294 \ud45c\uba74\uc5d0 \uc778\uc7a5 \uc751\ub825\uc744 \uac00\ud569\ub2c8\ub2e4. \uc774 \uc751\ub825\uc774 \uc7ac\ub8cc\uc758 \uad6d\ubd80\uc801\uc778 \uac15\ub3c4\ub97c \ucd08\uacfc\ud558\uba74 \ud45c\uba74\uc5d0\uc11c \uade0\uc5f4\uc774 \ubc1c\uc0dd\ud558\uc5ec \ub0b4\ubd80\ub85c \uc804\ud30c\ub429\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/aobosteel.com\/ko\/tool-steel-hardening-tempering-chart\/\" type=\"link\" id=\"https:\/\/aobosteel.com\/tool-steel-quenching\/\">\u2192 \uacf5\uad6c\uac15 \uc5f4\ucc98\ub9ac\uc5d0\uc11c \ub2f4\uae08\uc9c8\uc774 \uc5b4\ub5bb\uac8c \uc791\uc6a9\ud558\ub294\uc9c0 \uc54c\uc544\ubcf4\uc138\uc694<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-factors-influencing-cracking-risk\">\uade0\uc5f4 \uc704\ud5d8\uc5d0 \uc601\ud5a5\uc744 \ubbf8\uce58\ub294 \uc694\uc778<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\uade0\uc5f4 \ubc1c\uc0dd \uc704\ud5d8\uc740 \ub2f4\uae08\uc9c8 \uacfc\uc815\uc5d0\uc11c \uc751\ub825\uc774 \uc5b4\ub5bb\uac8c \ubc1c\uc0dd\ud558\uace0 \uc9d1\uc911\ub418\ub294\uc9c0\uc5d0 \ub530\ub77c \uc88c\uc6b0\ub429\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uc7ac\ub8cc \uad6c\uc131\uc740 \ubcc0\ud615 \uac70\ub3d9\uc5d0 \uc9c1\uc811\uc801\uc778 \uc601\ud5a5\uc744 \ubbf8\uce69\ub2c8\ub2e4. \ud0c4\uc18c \ud568\ub7c9\uc774 \ub192\uc744\uc218\ub85d \ubd80\ud53c \ud33d\ucc3d\uc774 \uc99d\uac00\ud558\uace0 \ubcc0\ud615 \uc628\ub3c4\uac00 \ub0ae\uc544\uc838 \uc751\ub825 \uc644\ud654\uac00 \uac10\uc18c\ud558\uace0 \uade0\uc5f4 \ubc1c\uc0dd \uac00\ub2a5\uc131\uc774 \ub192\uc544\uc9d1\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud615\uc0c1\uc740 \uc5f4 \ucd94\ucd9c \ubc0f \uc751\ub825 \ubd84\ud3ec\ub97c \uc81c\uc5b4\ud569\ub2c8\ub2e4. \ub0a0\uce74\ub85c\uc6b4 \ubaa8\uc11c\ub9ac, \ud0a4\ud648, \ub2e8\uba74 \ub450\uaed8\uc758 \ud070 \ucc28\uc774\ub294 \ubd88\uade0\uc77c\ud55c \ub0c9\uac01\uc744 \uc720\ubc1c\ud558\uc5ec \ud2b9\uc815 \uc704\uce58\uc5d0 \uc751\ub825\uc744 \uc9d1\uc911\uc2dc\ud0b5\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud45c\uba74 \uc0c1\ud0dc\ub294 \uade0\uc5f4 \ubc1c\uc0dd \uc704\uce58\ub97c \uacb0\uc815\ud569\ub2c8\ub2e4. \uac00\uacf5 \uc790\uad6d, \uc2a4\ud0ec\ud551 \uacb0\ud568 \ubc0f \uc57c\uae08\ud559\uc801 \ubd88\uc5f0\uc18d\uc131\uc740 \uc751\ub825 \uc9d1\uc911\uc810\uc73c\ub85c \uc791\uc6a9\ud569\ub2c8\ub2e4. \ud45c\uba74 \ud0c8\ud0c4\uc740 \ud45c\uba74\uacfc \uc911\uc2ec\ubd80 \uc0ac\uc774\uc758 \ubcc0\ud0dc \uc2dc\uae30\ub97c \ub354\uc6b1 \ubcc0\ud654\uc2dc\ucf1c \ub0c9\uac01 \uc911 \ubd88\uc77c\uce58\ub97c \uc99d\uac00\uc2dc\ud0b5\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uc624\uc2a4\ud14c\ub098\uc774\ud2b8\ud654 \uacf5\uc815\uc740 \uad6c\uc870\uc801 \uac15\ub3c4\uc5d0 \uc601\ud5a5\uc744 \ubbf8\uce69\ub2c8\ub2e4. \uacfc\ub3c4\ud55c \uc628\ub3c4\ub294 \uacb0\uc815\ub9bd \uc870\ub300\ud654\ub97c \ucd08\ub798\ud558\uc5ec \ub2f4\uae08\uc9c8 \uc911 \uc785\uacc4 \ud30c\uad34\uc5d0 \ub300\ud55c \uc800\ud56d\uc131\uc744 \uac10\uc18c\uc2dc\ud0b5\ub2c8\ub2e4.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-identification-in-practice\">\uc2e4\uc81c \uc2dd\ubcc4<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\ub2f4\uae08\uc9c8 \uade0\uc5f4\uc740 \ubc1c\uc0dd \uc6d0\uc778, \ud615\ud0dc \ubc0f \uc57c\uae08\ud559\uc801 \ud2b9\uc9d5\uc73c\ub85c \uc2dd\ubcc4\ub429\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uade0\uc5f4\uc740 \uc77c\ubc18\uc801\uc73c\ub85c \ud45c\uba74\uc5d0\uc11c \uc2dc\uc791\ud558\uc5ec \uc624\uc2a4\ud14c\ub098\uc774\ud2b8 \uacb0\uc815\ub9bd\uacc4\ub97c \ub530\ub77c \uc9c4\ud589\ud558\uba70, \uadf8 \uacb0\uacfc \uc785\uacc4 \ud30c\uad34 \uacbd\ub85c\uac00 \ub098\ud0c0\ub0a9\ub2c8\ub2e4. \uade0\uc5f4 \ubc1c\uc0dd \ud6c4 \ud15c\ud37c\ub9c1\uc774 \uc774\ub8e8\uc5b4\uc9c0\uba74 \uade0\uc5f4 \ub0b4\ubd80\uc758 \uc0b0\ud654\ub85c \uc778\ud574 \ud15c\ud37c\ub9c1 \uc0c9\uc774\ub098 \uc2a4\ucf00\uc77c\uc774 \uc0dd\uc131\ub418\ub294\ub370, \uc774\ub294 \uade0\uc5f4\uc774 \ud15c\ud37c\ub9c1 \uc804\uc5d0 \ubc1c\uc0dd\ud588\uc74c\uc744 \ub098\ud0c0\ub0c5\ub2c8\ub2e4. \ubc18\uba74, \uc5f4\ucc98\ub9ac \ud6c4\uc5d0 \ubc1c\uc0dd\ud55c \uade0\uc5f4\uc740 \ub0b4\ubd80 \uc0b0\ud654\ub97c \ubcf4\uc774\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uace0\uc628 \ub2e8\uacc4 \uc774\ud6c4\uc5d0 \uade0\uc5f4\uc774 \ubc1c\uc0dd\ud558\uae30 \ub54c\ubb38\uc5d0 \uc8fc\ubcc0 \ubbf8\uc138\uad6c\uc870\uc5d0\uc11c\ub294 \ud0c8\ud0c4 \ud604\uc0c1\uc774 \ub098\ud0c0\ub098\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-prevention-and-mitigation\">\uc608\ubc29 \ubc0f \uc644\ud654<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\uc608\ubc29\uc740 \uc2a4\ud2b8\ub808\uc2a4 \uc9d1\uc911\uc744 \uc904\uc774\uace0 \ud574\ub2f9 \uc139\uc158 \uc804\uccb4\uc5d0 \uac78\uccd0 \ubcc0\ud654\uc758 \uc870\ud654\ub97c \uc774\ub8e8\ub294 \ub370 \uc911\uc810\uc744 \ub461\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud615\uc0c1\uc740 \uade0\uc77c\ud55c \ub0c9\uac01\uc744 \ucd09\uc9c4\ud558\uae30 \uc704\ud574 \uae09\uaca9\ud55c \ubcc0\ud654\ub098 \ud070 \ub450\uaed8 \ucc28\uc774\ub97c \ud53c\ud558\ub3c4\ub85d \uc124\uacc4\ud574\uc57c \ud569\ub2c8\ub2e4. \ud45c\uba74 \ucc98\ub9ac\ub294 \uac00\uacf5 \uacb0\ud568\uc744 \uc81c\uac70\ud558\uace0 \uac00\uc5f4 \uc911 \ud0c8\ud0c4\uc744 \ubc29\uc9c0\ud574\uc57c \ud569\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ub2f4\uae08\uc9c8 \ubc29\ubc95\uc740 \ub0c9\uac01 \uc18d\ub3c4\ub97c \uc81c\uc5b4\ud558\uace0 \uc628\ub3c4 \uad6c\ubc30\ub97c \uc904\uc774\uae30 \uc704\ud574 \uc120\ud0dd\ud574\uc57c \ud569\ub2c8\ub2e4. \ub9c8\ub974\ud15c\ud37c\ub9c1\uacfc \uac19\uc740 \uacf5\uc815\uc740 \ubcc0\ud0dc \uc804\uc5d0 \uc628\ub3c4\ub97c \uade0\uc77c\ud558\uac8c \ub9cc\ub4e4\uc5b4 \ub0b4\ubd80 \uc751\ub825\uc744 \ud06c\uac8c \ub0ae\ucda5\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ub2f4\uae08\uc9c8 \uc9c1\ud6c4, \uc989 \ubd80\ud488\uc774 \uc544\uc9c1 \ub530\ub73b\ud560 \ub54c \ud15c\ud37c\ub9c1\uc744 \uc2e4\uc2dc\ud558\uc5ec \uc794\ub958 \uc751\ub825\uc744 \uc644\ud654\ud558\uace0 \uc9c0\uc5f0 \uade0\uc5f4\uc744 \ubc29\uc9c0\ud574\uc57c \ud569\ub2c8\ub2e4.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-material-selection-and-hardenability\">\uc7ac\ub8cc \uc120\ud0dd \ubc0f \uacbd\ud654\uc131<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\uc7ac\ub8cc \uc120\ud0dd\uc740 \ub2f4\uae08\uc9c8 \uacfc\uc815\uc5d0\uc11c \ubc1c\uc0dd\ud558\ub294 \uc751\ub825 \uc218\uc900\uc744 \uc81c\uc5b4\ud569\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uacbd\ud654\uc131\uc774 \ub0ae\uc740 \uac15\uc740 \ucd5c\ub300 \uacbd\ub3c4\ub97c \uc5bb\uae30 \uc704\ud574 \uae09\uc18d \ub0c9\uac01\uc774 \ud544\uc694\ud558\uba70, \uc774\ub85c \uc778\ud574 \uae09\uaca9\ud55c \uc628\ub3c4 \uad6c\ubc30\uc640 \ub192\uc740 \ub0b4\ubd80 \uc751\ub825\uc774 \ubc1c\uc0dd\ud569\ub2c8\ub2e4. \ub530\ub77c\uc11c \uc774\ub7ec\ud55c \uac15\uc740 \ub2e8\uc21c\ud55c \ud615\uc0c1\uc5d0\ub9cc \uc801\ud569\ud569\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"h-\">High-hardenability tool steels transform at slower cooling rates, allowing air or mild quenching. This reduces temperature gradients and internal stress, making them more suitable for complex shapes and large sections. The section each grade will harden through at a given quench is in the <a href=\"https:\/\/aobosteel.com\/ko\/tool-steel-hardenability-chart\/\">tool steel hardenability chart<\/a>.<\/p>\n<\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>Quench Cracking in Tool Steel: Mechanisms, Identification, and Prevention What is Quench Cracking? Quench cracking is a failure that occurs during or shortly after quenching. Cracks typically initiate at the surface and propagate inward along longitudinal or radial paths. Once formed, the component cannot be recovered. Why Quench Cracking Occurs Quench cracking occurs when internal [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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Cracking in Tool Steel: Mechanisms, Identification, and Prevention What is Quench Cracking? Quench cracking is a failure that occurs during or shortly after quenching. Cracks typically initiate at the surface and propagate inward along longitudinal or radial paths. Once formed, the component cannot be recovered. Why Quench Cracking Occurs Quench cracking occurs when internal&hellip;","rttpg_featured_image_url":null,"rttpg_author":{"display_name":"Evan","author_link":"https:\/\/aobosteel.com\/ko\/blog\/author\/admin\/"},"rttpg_comment":0,"rttpg_category":null,"rttpg_excerpt":"Quench Cracking in Tool Steel: Mechanisms, Identification, and Prevention What is Quench Cracking? Quench cracking is a failure that occurs during or shortly after quenching. Cracks typically initiate at the surface and propagate inward along longitudinal or radial paths. Once formed, the component cannot be recovered. 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