SLD-MAGIC冷作模具钢的热处理微畸变特性及其机理
Heat treatment microdistortion characteristics and mechanism of SLD-MAGIC cold working die steel
吴红庆 1毛宏 1邓志鹏 1宁辉 1吴晓春1
作者信息
- 1. 上海大学材料科学与工程学院,上海 200444;上海大学省部共建高品质特殊钢冶金与制备国家重点实验室,上海 200444
- 折叠
摘要
采用真空热处理炉测试了 SLD-MAGIC和DC53冷作模具钢样块在1030 ℃淬火、及210 ℃回火和520 ℃回火3种热处理条件下尺寸的畸变率,并结合X射线衍射仪(XRD)、扫描电镜(SEM)、高精度差分膨胀仪、JMatPro软件等手段对微观结构、马氏体的特征参数、残留奥氏体含量、回火碳化物含量等进行分析.结果表明,SLD-MAGIC钢和DC53钢样块经上述3种热处理后体积膨胀,尺寸畸变率范围在0.02％～0.12％之间,DC53钢在同等热处理条件下平均尺寸畸变率约为SLD-MAGIC钢的1.9～2.2倍;SLD-MAGIC钢25～700 ℃以上的平均热膨胀系数比DC53钢的低0.15 × 10-6 ℃-1;SLD-MAGIC钢的马氏体碳含量和晶格常数分别为1.34％、2.8894 x 10-10m,都比DC53钢小;并且热处理后的残留奥氏体含量和回火碳化物含量都比DC53钢少,因此SLD-MAGIC钢比DC53钢的尺寸膨胀效应更小,SLD-MAGIC钢具有热处理微畸变特性.
Abstract
Vacuum heat treatment furnace was used to test the dimensional distortion rate of SLD-MAGIC and DC53 cold working die steel specimens under three heat treatment conditions of quenching at 1030 ℃,tempering at 210 ℃ and tempering at 520 ℃,and combined with X-ray diffractometer(XRD),scanning electron microscope(SEM),high-precision differential dilatometer,JMatPro software to analyze the microstructure,characteristic parameters of martensite,the content of retained austenite and the content of secondary carbides.The results show that the volumes of the SLD-MAGIC and DC53 steel specimens expand after the three heat treatments,and their dimensional distortion rates range from 0.02％to 0.12％.The average dimensional distortion rate of the DC53 steel is about 1.9 to 2.2 times that of the SLD-MAGIC steel under the same heat treatment conditions.The average thermal expansion coefficient of the SLD-MAGIC steel from 25 ℃ to 700 ℃ is 0.15 × 10-6 ℃-1 lower than that of the DC53 steel,the carbon content and lattice constant of the martensite of the SLD-MAGIC steel are 1.34％and 2.8894 × 10-10 m,respectively,which are smaller than that of the DC53 steel.The content of retained austenite and the content of secondary carbide of SLD-MAGIC steel after heat treatment are less than that of the DC53 steel.Therefore,the size expansion effect of the SLD-MAGIC steel is smaller than that of the DC53 steel,and the SLD-MAGIC steel has the characteristic of heat treatment microdistortion.
关键词
SLD-MAGIC冷作模具钢/热处理微畸变/马氏体/残留奥氏体/回火碳化物Key words
SLD-MAGIC cold working die steel/heat treatment microdistortion/martensite/retained austenite/carbide in tempering引用本文复制引用
基金项目
国家重点研发计划(2016YFB0300403)
模具钢选材和用材技术的标准化研究项目(SKLASS2021-11)
出版年
2024
NETL
NSTL
万方数据