摘要
42CrMoA螺栓套在调质热处理中出现开裂现象。为找出开裂原因,对螺栓套的化学成分、硬度、非金属夹杂物、断口微观形貌、金相组织进行检验分析。结果表明：工件化学成分不符合国家标准要求,S元素超标;该工件内部存在严重金属氧化物及硫化物夹杂,热处理淬火时沿着夹杂物尖端引起开裂;金相组织为细小均匀且保持马氏体方位的回火索氏体,纵截面存在明显的带状组织。建议严格控制42CrMoA非金属夹杂物及热处理淬火加热温度和保温时间;同时,也为42CrMoA钢的调质工艺参数的优化提供了参考性建议。
Cracking phenomenon of 42CrMoA bolt sleeve in quenching and tempering heat treatment occurs. In order to find out the cause of cracking, the chemical composition, hardness, non-metallic inclusions, fracture morphology and microstructure were analyzed. The results show that the chemical composition of the workpiece does not meet the national standard requirements, S element exceeds the standard; the workpiece has serious internal metal oxide and sulfide inclusions,and it is easy to crack along the tip of inclusions during quenching heat treatment; the microstructure is fine, uniform tempered sorbite with martensite orientation, there are obvious banded structure in longitudinal section. It is suggested to strictly control the 42CrMoA non-metallic inclusions and quenching temperature and holding time. Meanwhile, it provides reference for optimizing the process parameters of 42CrMoA steel.
作者
马召磊
孙维连
王会强
李娇娇
武卫超
MA Zhaolei;SUN Weilian;WANG Huiqiang;LI Jiaojiao;WU Weichao(School of Mechanical and Electrical Engineering,Agricultural University of Hebei,Baoding 071000,China)
出处
《热加工工艺》
CSCD
北大核心
2018年第16期260-262,共3页
Hot Working Technology
基金
河北农业大学理工基金重点项目(ZD201503)
河北省高等学校科学技术研究重点基金项目(ZD2017035)
河北农业大学双语教学课程建设项目(2017SY3)
2017河北省大学生创新创业训练计划项目(2017043)
