| DJ4热卷弹簧纵向裂纹的原因分析和解决措施 |
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| 引用本文： | 邹志勇,梁益龙,谭起兵.DJ4热卷弹簧纵向裂纹的原因分析和解决措施[J].理化检验(物理分册),2008,44(9):494-497. |
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| 作者姓名： | 邹志勇 梁益龙 谭起兵 |
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| 作者单位： | 贵州大学材料科学与冶金工程学院贵州省材料结构与强度重点实验室,贵阳550003 |
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| 基金项目： | 贵州省科技厅重大专项 |
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| 摘 要： | 采用表面形态、金相组织、硬度和冲击断口分析等方法对淬火纵向开裂DJ4弹簧进行了分析。结果表明，制扁后表面缺陷、脱碳及夹杂物的纵向分布，是产生纵向裂纹的诱因；卷制前加热温度过高，晶粒粗大，是产生纵向裂纹的主要原因。提出了整改措施，即对热处理工艺的调整和卷制后空冷到600℃重结晶细化晶粒，抑制了纵向裂纹的产生，使冲击断裂韧性得到较大提高。
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| 关 键 词： | 弹簧 纵向裂纹 50CrVA钢 |
REASON ANALYSIS AND AVOIDANCE MEASURES ON THE VERTICAL QUENCHING-CRACKING FOR HOT-FORGING DJ4 SPRING |
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| ZOU Zhi-yong,LIANG Yi-long,TAN Qi-bing.REASON ANALYSIS AND AVOIDANCE MEASURES ON THE VERTICAL QUENCHING-CRACKING FOR HOT-FORGING DJ4 SPRING[J].Physical Testing and Chemical Analysis Part A:Physical Testing,2008,44(9):494-497. |
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| Authors: | ZOU Zhi-yong LIANG Yi-long TAN Qi-bing |
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| Affiliation: | (Guizhou Key Laboratory [or Mechanical Behavior and Microstrueture of Materials, School of Materials Science and Metallurgical Engineering, Guizhou University, Guiyang 550003, China) |
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| Abstract: | The vertical quenching-cracking of metallograph, hardness test and impact fracture analysis. DJ4 spring was investigated through surface form, The results show that the surface flaws, decarbonization and inclusions are the induced factors; over-high austenitizing temperature promotes growth of the origin austenite grains of the steel and infirmness of grain boundary is the main reason. The vertical crack is avoided by adjusting the heat treatment process and recrystallization cooled to 600℃ after hot-forging, which make the fracture toughness property of impact improve greatly. |
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| Keywords: | Spring vertical quenching-cracking 50CrVA steel |
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