国产高性能磨具钢技术突破2019_国产高性能磨具钢技术突破2019_国产高性能相机

3种磨具钢组织与功耗的对比研究

刘博1国产高性能模具钢技术突破2019，孙国栋2，刘长华2，张立胜2（1.九江学院旅游与国土资源学院，江西南昌332005；2.九江学院机械与材料工程学院，江西南昌332005）

摘要：采用金相显微镜、洛氏硬度计、冲击试验机与扫描电镜（SEM）对回火+回火热处理后的SKD11钢、GD钢跟LD钢的组织、硬度、冲击硬度及断口形貌进行了检测跟剖析。研究结果阐明：3种钢经回火+回火后的组织均由棒状马氏体+碳化物+少量残余奥氏体构成国产高性能模具钢技术突破2019，但马氏体跟载流子的型态有显著不同；淬火+回火后SKD11钢的硬度值为55.6 HRC，冲击能量约为63 J，GD钢的硬度值为58.6 HRC，冲击能量约为31 J，LD钢的硬度值为58.8 HRC，冲击能量约为75 J。3种磨具钢断口宏观形貌均展现出微量塑性变型的微晶瓷状特性，微观断口形貌为撕裂棱相通的小块解理面，3种钢的破裂成因均为准解理延性破断。

关键词：模具钢；组织；硬度；冲击功；断口形貌

中图分类号：TG76 文献标识码：B 文章编号：1001-2168（2019）04-0049-05

DOI：10.16787/j.cnki.1001-2168.dmi.2019.04.013

Comparative research on microstructure and property of three kinds of die steels

LIU Bo1, SUN Guo-dong2, LIU Chang-hua2, ZHANG Li-sheng2 (1.College of Tourism and Territorial Resources, Jiujiang University, Jiujiang, Jiangxi, 332005, China; 2.School of Mechanical & Material Engineering, Jiujiang University, Jiujiang, Jiangxi, 332005, China)

Abstract: The microstructure, hardness, impact toughness and fracture morphology of SKD11 steel, GD steel and LD steel after quenching and tempering treatment were tested and analyzed by metallographic microscope, Rockwell hardness tester, impact tester and scanning electron microscopy (SEM)。 The results showed that the structures of three steels after quenching and tempering were composed of needle martensite, carbide and a small amount of retained austenite, but the morphology of martensite and carbide was obviously different。

The hardness of SKD11 steel after quenching and tempering was 55。6 HRC and the impact energy was about 63 J。 The hardness of GD steel was 58。6 HRC and the impact energy was about 31 J。 The hardness of LD steel was 58。8 HRC and the impact energy was about 75 J。 The fracture morphology of the three kinds of die steels presented microcrystalline ceramic-like characteristics of microplastic deformation。 The microfracture morphology was a small cleavage surface connected by tearing edges。 The fracture mechanism of the three kinds of steels were quasi-cleavage brittle fracture。

Key words: die steel; structure; hardness; impact force; fracture morphology

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