锻压技术

热处理工艺参数对Cr8冷作模具钢组织和性能的影响

英文标题：Influence of heat treatment parameters on microstructure and property of Cr8 cold working die steel

作者：元莎白玉冰周乐育叶丽燕蒋鹏

关键词：Cr8钢回火二次硬化碳化物硬度

分类号：TG142

出版年,卷(期):页码：2020,45(1):168-172

摘要：

针对Cr8冷作模具钢的二次硬化问题，采用金相显微镜、SEM、EDS和洛氏硬度计，研究了低温回火和高温回火对Cr8冷作模具钢材料组织和性能的影响。结果表明，原材料组织为珠光体和少量长为9～41 μm、宽为2～11 μm大颗粒共晶碳化物；不同回火温度下，材料的组织为马氏体和少量长为4～25 μm、宽为1～8 μm的大颗粒共晶碳化物及细小二次析出碳化物；经1030 ℃淬火、高温520 ℃回火之后材料出现二次硬化现象，硬度为58.4 HRC，比低温200 ℃回火下的硬度高出1.4 HRC。Cr8钢的二次硬化是由于高温520 ℃回火之后，二次纳米级小颗粒碳化物析出较多，且颗粒均匀弥散分布于基体中造成的。

For the secondary hardening problem of Cr8 cold working die steel, the influences of low temperature tempering and high temperature tempering on microstructure and property of Cr8 cold working die steel were studied by metallographic microscope, SEM, EDS and Rockwell hardness tester. The result shows that the structure of raw material are pearlite and a small amount of eutectic carbides with the length of 9-41 μm and the width of 2-11 μm, and after tempering at different temperatures, the structures of material are martensite and a small amount of large particle eutectic carbides with the length of 4-25 μm and the width of 1-8 μm as well as small secondary precipitation carbides. When the material is quenched at 1030 ℃ and tempered at 520 ℃, the material shows secondary hardening phenomenon with the hardness of 58.4 HRC, which is 1.4 HRC higher than that at a low temperature of 200 ℃. Furthermore, the secondary hardening of Cr8 steel is caused by the substantial precipitation of secondary nano-sized small particle carbides after tempering at a high temperature of 520 ℃, and the particles are evenly distributed in the matrix.

基金项目：

国家重点研发计划项目（2016YFB0300405）

元莎（1990-），女，博士研究生 E-mail：741916485@qq.com 通讯作者：蒋鹏（1964-），男，博士，博士生导师，研究员 E-mail：jp1964@163.com

参考文献：

[1]迟宏宵，马党参，刘建华，等.不同Nb-V含量对Cr8型冷作模具钢微观组织和力学性能的影响[J].金属学报，2010，46(2):206-212.

[JP3]Chi H X, Ma D S, Liu J H, et al. Effects of different Nb-V contents on microstructure and mechanical properties of Cr8|type cold work die steel [J]. Acta Metallurgica Sinica, 2010, 46 (2):206-212.

[2]伊藤一夫，常陆美朝.高C-高Cr冷作工具钢热处理特性及C-Cr的影响[J].电气制钢，1982，53(4):256-264.

Ito Yifu, Hitachi Y. Heat treatment characteristics of high C-high Cr cold working tool steels and effect of C-Cr[J]. Electrical Steels, 1982, 53 (4): 256-264.

[3]松田幸纪，须藤兴一，常陆美朝.1C-1Si-8Cr-2Mo系冷作模具钢高温二次硬化现象[J].电气制钢，1989，60(4):311-323.

Matsuda Y, Sudoh K I, Hitachi Y. The tempered hardness at higher temperature and secondary hardening behavior in 1C-1Si-8Cr-2Mo cold work die steel[J]. Electrical Steels, 1989, 60(4):311-323.

[4]Yan F，Shi H，Fan J，et al. An investigation of secondary carbides in the spray-formed high alloyed Vanadis 4 steel during tempering[J].Materials Characterization，2008，59(7): 883-889.

[5]迟宏宵，马党参，王昌，等.CrSMo2SiV钢二次硬化机理的研究[J].金属学报，2010，46(10):1181-1185.

Chi H X, Ma D S, Wang C, et al. Study on scondary hardening mchanism of CrSMo2SiV steel [J]. Journal of Metals, 2010, 46 (10): 1181-1185.

[6]邱凌,吴晓春.国内外冷作模具钢发展概述[J].模具制造,2017,17(11):89-96.

Qiu L, Wu X C. Overview of development of cold work die steel at home and abroad [J]. Die Manufacturing, 2017,17(11):89-96.

[7]Kim H, Kang J Y, Son D, et al. Evolution of carbides in cold-work tool steels[J]. Acta Metallurgica Sinica, 2015,107:376-385.

[8]GB/T 2302—2002,金属洛氏硬度试验第2部分：硬度计(A、B、C、D、E、F、G、H、K、N、T标尺)的检验与校准[S].

GB/T 2302—2002, Metal rockwell hardness test—Part 2: Verification and calibration of hardness testers (scales A, B, C, D, E, F, G, H, K, N, T) [S].

[9]GB/T 16594—2008, 微米级长度的扫描电镜测量方法通则[S].

GB/T 16594—2008, General rules for measurement of length in micron scale by SEM[S].

[10]GB/T 15616—2008, 金属及合金的电子探针定量分析方法[S].

GB/T 15616—2008, Quantitative method for electron probe microanalysis of metals and alloys [S].

[11]赵士光. Cr8型冷轧辊用钢淬火回火工艺研究[D].秦皇岛：燕山大学,2012.

Zhao S G. Study on Quenching and Tempering Process of Cr8 Cold Roll Steel [D]. Qinhuangdao: Yanshan University, 2012.

[12]陈锟.控制Cr5钢冷轧辊坯质量的锻造变形工艺[D].上海:上海大学，2012.

Chen K. Research on the Forging Process Controlling Quality of Cr5 Cold Roll Blank [D]. Shanghai: Shanghai University, 2012.

[13]戚正风.金属热处理原理[M].北京:机械工业出版社，1986.

Qi Z F. Principle of Metal Heat Treatment [M]. Beijing: China Machine Press, 1986.

服务与反馈：

【文章下载】【加入收藏】