40CrNiMoA钢台阶轴表面裂纹产生原因分析  

Analysis of surface cracking on 40CrNiMoA steel step shaft

作　　者：李雪峰[1,2] 王刚 潘恒沛 王世宁 LI Xuefeng;WANG Gang;PAN Hengpei;WANG Shining(Luoyang Ship Material Research Institute,Luoyang 471023,China;Henan Key Laboratory of Technology and Application of Structural Materials for Ships and Marine Equipments,Luoyang 471023,China;Luoyang Sunrui Wanji Titanium Industry Co.,Ltd.,Luoyang 471000,China)

机构地区：[1]中国船舶重工集团公司第七二五研究所,河南洛阳471023 [2]河南省船舶及海工装备结构材料技术与应用重点实验室,河南洛阳471023 [3]洛阳双瑞万基钛业有限公司,河南洛阳471000

出　　处：《物理测试》2021年第6期33-37,共5页Physics Examination and Testing

摘　　要：40CrNiMoA钢台阶轴调质后加工时发现表面有裂纹,通过宏观分析、化学成分检测、金相分析以及断口形貌观察等方法对台阶轴的裂纹产生原因进行了分析。结果表明:台阶轴的显微组织较粗大,断口呈沿晶形貌,台阶轴的裂纹为淬火裂纹,淬火温度偏高和台阶位置组织应力较大是台阶轴产生裂纹的主要原因。Cracks were found on the surface of 40CrNiMoA steel step shaft during further machining after quenching and tempering.The causes of surface cracking were analyzed by means of macroscopic analysis,chemical composition analysis,metallographic observation,and fracture morphology observation.The results showed that the microstructure of the step shaft was coarse.The fracture had intergranular morphology.The cracks of the step shaft belonged to quenching cracking.The high quenching temperature and excessive quenching stress were the main reasons for the cracking of the step shaft.

关 键 词：40CrNiMoA钢台阶轴 调质 淬火裂纹 应力 

分 类 号：TH133.2[机械工程—机械制造及自动化]