锻压技术

叉轴锻造内部裂纹成因分析

英文标题：Analysis on forging internal cracks of yoke shaft

作者：王云飞曹耕原岳渊渊曹淑芬王云洛

关键词：叉轴锻造变形速度内部裂纹

分类号：TG316

出版年,卷(期):页码：2015,40(12):7-10

摘要：

某型号油缸叉轴经过感应淬火后在其轴颈位置发现有裂纹存在，采用化学成分分析、金相检验、断口宏观及微观观察、热酸蚀检测等方法对叉轴材质和热处理质量进行了全面分析。分析结果表明：叉轴材料的化学成分符合要求，无原材料冶金缺陷；截取试样的内部裂纹表面，电镜观察可以看到明显的自由结晶表面特征；裂纹起源于零件内部变形量最大处；锻造过程中加热温度过高、变形量大以及由于变形速度过快产生的形变能所引起的高温是产生叉轴内部裂纹的主要原因。

For the cracks in the neck of a type of cylinder yoke shaft after the induction hardening, the material and heat treatment quality of the yoke shaft were studied comprehensively by chemical composition analysis, metallographic examination, macroscopic and microcosmic observation and thermal etching experiments. The results show that the chemical composition of yoke shaft meets the requirements without the metallurgical defects of the original material. In the internal crack surface of the intercepted sample, free crystallinity surface features can be observed obviously by the electron microscopy. Crack appears on the maximum deformation-position of the shaft. The main reasons of the internal cracks are large deformation, high-temperature caused by excessive heating and strain energy caused by high deformation velocity in the forging process.

基金项目：

作者简介：王云飞（1965-），男，硕士，教授级高工通信作者：岳渊渊（1989-），女，硕士，助理工程师

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