金属热处理 ›› 2021, Vol. 46 ›› Issue (1): 88-91.DOI: 10.13251/j.issn.0254-6051.2021.01.017

• 工艺研究 • 上一篇    下一篇

热处理工艺对P20模具钢组织和性能的影响

黄标彩1, 宁博2, 陈玉叶1, 武会宾2, 魏勇1, 詹光曹1, 严晓敏1   

  1. 1.福建三钢闽光股份有限公司,福建 三明 365000;
    2.北京科技大学 钢铁共性技术协同创新中心,北京 100083
  • 收稿日期:2020-06-15 出版日期:2021-01-25 发布日期:2021-01-26
  • 作者简介:黄标彩(1969—),男,教授级高级工程师,博士,主要研究方向为钢铁冶金,E-mail:huangbiaocai@sina.com
  • 基金资助:
    国家自然科学基金(51774033)

Effect of heat treatment processes on microstructure and properties of P20 die steel

Huang Biaocai1, Ning Bo2, Chen Yuye1, Wu Huibin2, Wei Yong1, Zhan Guangcao1, Yan Xiaomin1   

  1. 1. Sansteel Minguang Co.,Ltd.,Sanming Fujian 365000,China;
    2. CICST in University of Science and Technology Beijing,Beijing 100083,China
  • Received:2020-06-15 Online:2021-01-25 Published:2021-01-26

摘要: 采用洛氏硬度和扫描电镜对“淬火+回火”、“正火+回火”和“热轧+回火”3种热处理工艺后P20钢的性能和组织进行对比分析。结果表明:3种工艺制备的试验钢回火热处理前的硬度虽有不同,随着回火温度升高硬度的变化趋势却相似,均呈现“缓降-陡降-再缓降“的趋势,其中580~600 ℃回火温度区间为3种工艺所共同具有的硬度“陡降”区间,此区间所对应的硬度范围分别为“淬火+回火”37.12~32.31 HRC,“正火+回火”34.87~31.07 HRC,“热轧+回火”35.00~31.63 HRC;“陡降”区间与GB/T 1299—2014所要求的硬度范围28~36 HRC基本重合。而对于相同的回火温度,“淬火+回火”试样的硬度值比“热轧+回火”试样的要高,而“正火+回火”试样的硬度比“热轧+回火”试样的要低。

关键词: 模具钢, 热处理, 硬度, 组织演变

Abstract: Poperties and microstructure of P20 steel with different heat treatment processes of “quenching+tempering”,“normalizing+tempering” and “hot rolling+tempering”,were compared and analyzed by means of Rockwell hardness and scanning electron microscopy (SEM).The results show that in despite of the difference of the hardness before tempering,the change trend of the three specimens were similar showing “slow down - a steep fall - and then slow down again”,and in the range of 580-600 ℃ all the three kinds of specimens showing the “steep fall” trend.The hardness at the “steep fall” is 37.12-32.31 HRC for quenching+tempering specimen,34.87-31.07 HRC for normalizing+tempering specimen and 35.00-31.63 HRC for hot rolling+tempering specimen,which is basically coincides with the range of 28-36 HRC required by GB/T 1299—2014.For the same tempering temperature,the hardness of “quenching+ tempering” specimen is higher than that of “hot rolling &tempering” specimen,while the hardness of “normalizing+tempering” specimen is lower than that of “hot rolling+tempering” specimen.

Key words: die steel, heat treatment, hardness, microstructure evolution

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