锻后固溶预处理对H13钢退火组织和冲击性能的影响

doi:10.13251/j.issn.0254-6051.2021.02.022

金属热处理 ›› 2021, Vol. 46 ›› Issue (2): 130-135.DOI: 10.13251/j.issn.0254-6051.2021.02.022

锻后固溶预处理对H13钢退火组织和冲击性能的影响

孙立国¹, 周健², 马党参², 迟宏宵²

1.抚顺特殊钢股份有限公司, 辽宁抚顺 113001;
2.钢铁研究总院特殊钢研究所, 北京 100081

收稿日期:2020-07-29 出版日期:2021-02-25 发布日期:2021-05-08
通讯作者: 周健,高级工程师,博士,E-mail:zhou-jian-168@163.com
作者简介:孙立国(1973—),男,高级工程师,硕士,主要研究方向为电渣冶炼及热加工工艺,E-mail:sunliguo@fs-ss.com。

Effect of solution pretreatment after forging on annealed microstructure and impact property of H13 steel

Sun Liguo¹, Zhou Jian², Ma Dangshen², Chi Hongxiao²

1. Fushun Special Steel Co., Ltd., Fushun Liaoning 113001, China;
2. Special Steels Research Institute, Central Iron & Steel Research Institute, Beijing 100081, China

Received:2020-07-29 Online:2021-02-25 Published:2021-05-08

摘要/Abstract

摘要： 利用相分析、SEM及TEM试验方法,结合Thermo-Calc热力学软件计算了H13钢平衡相图,研究了不同固溶预处理及等温球化退火工艺对H13热作模具钢的组织和冲击性能的影响。结果表明:H13钢经1000、1050和1100 ℃固溶预处理后,随着固溶温度的升高,以V为主的MC型未溶碳化物数量逐渐减少,1100 ℃固溶预处理后,未溶碳化物基本溶解,同时晶粒粗化;经过固溶预处理及等温球化退火后,试验钢中碳化物分布均匀性和圆整度均提高,但1100 ℃固溶时晶粒尺寸粗化,退火过程形成粗大网状碳化物并沿粗大马氏体界面形核,降低了组织均匀性。H13钢经1000 ℃固溶预处理等温退火后,冲击性能较好,随着固溶预处理温度的升高,试验钢的冲击性能呈现明显的下降趋势。

关键词: H13钢, 固溶预处理, 等温球化退火, MC碳化物, 冲击性能

Abstract: Effects of different solution pretreatment and isothermal spheroidizing on the microstructure and impact property of H13 hot work die steel were studied by means of phase analysis, SEM, TEM, and equilibrium phase diagram of the H13 steel was calculated by Thermo-Calc software. The results show that after solution pretreatment at 1000 ℃, 1050 ℃ and 1100 ℃, the quantity of MC type undissolved carbides dominated by V gradually decreases with the increase of solution temperature. After solution pretreatment at 1100 ℃, undissolved carbides are basically dissolved and the grains are coarsened. After solution pretreatment and isothermal spheroidizing, the distribution uniformity and roundness of the carbides are improved, but the grain size is coarsened at 1100 ℃, and a coarse network is formed and nucleated along the coarse martensite interface during the annealing process, which reduces the structure uniformity. The impact property of the H13 steel is better when solution pretreated at 1000 ℃ and then isothermally spheroidized, and with the increase of solution pretreatment temperature, the impact property of the tested steel shows a significant downward trend.

Key words: H13 steel, solution pretreatment, isothermal spheroidizing, MC carbides, impact property

中图分类号:

TG156.94

孙立国, 周健, 马党参, 迟宏宵. 锻后固溶预处理对H13钢退火组织和冲击性能的影响[J]. 金属热处理, 2021, 46(2): 130-135.

Sun Liguo, Zhou Jian, Ma Dangshen, Chi Hongxiao. Effect of solution pretreatment after forging on annealed microstructure and impact property of H13 steel[J]. Heat Treatment of Metals, 2021, 46(2): 130-135.

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锻后固溶预处理对H13钢退火组织和冲击性能的影响

Effect of solution pretreatment after forging on annealed microstructure and impact property of H13 steel

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