金属热处理 ›› 2025, Vol. 50 ›› Issue (12): 161-165.DOI: 10.13251/j.issn.0254-6051.2025.12.024

• 工艺研究 • 上一篇    下一篇

等温处理时间对9%~12%Cr耐热钢组织遗传消除的影响

孙颖   

  1. 山西工程职业学院 冶金工程系, 山西 太原 030009
  • 收稿日期:2025-08-03 修回日期:2025-10-06 发布日期:2026-01-06
  • 作者简介:孙 颖(1984—),女,教授,硕士,主要研究方向为金属材料成形及热处理,E-mail:261238675@qq.com
  • 基金资助:
    山西省自然科学基金面上项目(20210302123163);山西省高等学校科技创新项目(2022L703)

Effect of isothermal treatment time on elimination of structural heredity in a 9%-12%Cr heat-resistant steel

Sun Ying   

  1. Metallurgical Engineering Department, Shanxi Engineering Vocational College, Taiyuan Shanxi 030009, China
  • Received:2025-08-03 Revised:2025-10-06 Published:2026-01-06

摘要: 采用平衡转变和模拟调质处理的方式,研究了10.5%Cr马氏体耐热钢经720 ℃等温处理不同时间(30~300 h)后组织遗传的消除规律,采用金相显微镜和扫描电镜对组织及晶粒度进行观察。结果表明,该试验钢平衡组织的转变量对组织遗传的消除有重要影响,等温处理足够长时间(120 h及以上)完全获得平衡组织(等轴铁素体+碳化物)后才能充分消除组织遗传。此外,应确保足够长的等温时间(270 h及以上),以降低平衡组织中碳化物的密集程度差距,使晶界钉扎效果更为均匀,从而实现晶粒的细化和均匀化。

关键词: 9%~12%Cr耐热钢, 等温处理, 组织遗传

Abstract: Elimination law of structural heredity in a 9%-12%Cr martensitic heat-resistant steel (with 10.5%Cr) after isothermally treated at 720 ℃ for different time (30-300 h)was studied using equilibrium transformation and simulated quenching and tempering treatment. The microstructure and grain size were observed using metallographic microscope and scanning electron microscope. The results show that the transformation of the equilibrium microstructure in the tested steel has an important impact on the elimination of structural heredity. Only when the isothermal time is long enough (120 h or more) to fully obtain an equilibrium microstructure (equiaxed ferrite + carbides), the structural heredity can be fully eliminated. In addition, a sufficiently long isothermal time(270 h or more) should be ensured to reduce the difference in the local density of carbides in the equilibrium microstructure and make the grain boundary pinning effect more uniform, so as to achieve grain refinement and homogenization.

Key words: 9%-12%Cr heat-resistant steel, isothermal treatment, structural heredity

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