718塑料模具钢锯切表面不平原因
Cause of Unevenness Saw Cutting Surface of 718 Plastic Mould Steel
摘 要
718塑料模具钢出现锯切表面不平问题。采用化学成分测试、组织形貌观察、微区成分分析以及硬度测试等方法对其表面不平原因进行分析。结果表明：铬、锰和钼元素的偏析是造成锯切表面不平的根本原因；元素偏析使得718塑料模具钢中形成由回火马氏体和回火下贝氏体组成的硬度高于基体组织的硬相组织，导致在锯切过程中产生表面不平问题；建议采取增大冷却强度或增加均质化热处理工艺来降低微观偏析，以避免该问题的产生。
锯切表面不平
元素偏析
硬度不均匀
718 plastic mould steel
unevenness of saw cutting surface
element segregation
uneven hardness
Abstract
The saw cutting surface appeared unevenness problem of the 718 plastic mould steel. The reason for the uneven surface was analyzed by chemical composition test, microstructure morphology observation, micro-area composition analysis and hardness test. The results show that the segregation of chromium, manganese and molybdenum was primary cause of the uneven saw cutting surface. The segregation of element made the 718 plastic mold steel form a hard mirostructure composed of tempered martensite and tempered lower bainite, which was harder than that of the hard microstructure of the substrate, leading to the unevenness of the surface during the cutting process. It was suggested that reducing the segregation by increasing the cooling strength, or adding the homogenization heat treatment process to avoid this problem.
中图分类号 TG142.1 DOI 10.11973/jxgccl202103019
所属栏目 失效分析
基金项目
收稿日期 2019/12/10
修改稿日期 2020/11/3
网络出版日期
作者单位点击查看
备注闫志波(1965-),男,河北石家庄人,副教授,硕士
引用该论文: YAN Zhibo,HE Huimin,WANG Xiangming. Cause of Unevenness Saw Cutting Surface of 718 Plastic Mould Steel[J]. Materials for mechancial engineering, 2021, 45(3): 98～102
闫志波,贺会敏,王向明. 718塑料模具钢锯切表面不平原因[J]. 机械工程材料, 2021, 45(3): 98～102
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参考文献
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【5】宋冬利,顾剑锋,胡明娟.预硬型塑料模具钢P20和718等温转变曲线的测定与分析[J].金属热处理,2003,28(12):27-29. SONG D L,GU J F,HU M J.Measurement and analysis of TTT diagrams of pre-hardened plastic die steels P20 and 718[J].Heat Treatment of Metals,2003,28(12):27-29.
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