东北大学学报（自然科学版）

东北大学学报（自然科学版） ›› 2021, Vol. 42 ›› Issue (6): 781-788.DOI: 10.12068/j.issn.1005-3026.2021.06.004

• 材料与冶金 • 上一篇    下一篇

淬火温度对12Cr14Ni2不锈结构钢组织及力学性能的影响

朱成林， 高秀华， 王明明， 宋丽英   

  1. (东北大学 轧制技术及连轧自动化国家重点实验室， 辽宁 沈阳110819)
  • 修回日期:2020-07-31 接受日期:2020-07-31 发布日期:2021-06-23
  • 通讯作者: 朱成林
  • 作者简介:朱成林(1994-)，男，安徽淮北人，东北大学博士研究生; 高秀华(1966-)，女，河北唐山人，东北大学教授，博士生导师.
  • 基金资助:
    国家高技术研究发展计划项目(2015AA03A501).

Effect of Quenching Temperature on Microstructure and Mechanical Properties of 12Cr14Ni2 Stainless Structural Steel

ZHU Cheng-lin， GAO Xiu-hua， WANG Ming-ming， SONG Li-ying   

  1. The State Key Laboratory of Rolling and Automation， Northeastern University， Shenyang 110819， China.
  • Revised:2020-07-31 Accepted:2020-07-31 Published:2021-06-23
  • Contact: GAO Xiu-hua
  • About author:-
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摘要： 使用光学显微镜(OM)、扫描电镜(SEM)、电子探针(EPMA)及透射电镜(TEM)分析研究了淬火温度对12Cr14Ni2索氏体不锈结构钢的显微组织和力学性能的影响.结果表明:热轧后的实验钢板经 900~1050℃保温0.5h淬火及710℃高温回火2h热处理后，均可以获得细小均匀的回火索氏体组织；回火索氏体晶界处存在大量直径100~200nm的富含Cr的M23C6型析出相；随着淬火温度从900℃升高到1050℃，淬火后奥氏体晶粒尺寸逐渐增大，进而导致热处理后的回火索氏体组织粗化；实验钢强度先减小后增大，延伸率和冲击功均先增加后降低；在最佳淬火温度950℃时，实验钢抗拉强度为767MPa，屈服强度为588MPa，断后延伸率为22%，在20℃时冲击功达107J，综合力学性能优异.

关键词: 12Cr14Ni2索氏体不锈结构钢；淬火温度；热处理；显微组织；力学性能

Abstract: Effect of quenching temperature on microstructure and mechanical properties of a 12Cr14Ni2 sorbite stainless steel was investigated by optical microscopy， scanning electron microscopy， electron probe and transmission electron microscopy， respectively. The results show that the fine and uniform tempered sorbite structures can be obtained in the hot-rolled steel plate after quenching at 900~1050℃ for 0.5h and tempering at 710℃ for 2h. There are a large number of Cr-riched M23C6 precipitates at the grain boundaries of tempered sorbite with a diameter of 100~200nm. As the quenching temperature increases from 900℃ to 1050℃， the austenitic grain size gradually increases after quenching， resulting in the coarsening of the tempered sorbite structure after heat treatments. The strength of the experimental steel first decreases and then increases， and both the elongation and impact energy increase first and then decrease. The excellent mechanical properties can be obtained at an optimal quenching temperature of 950℃， corresponding to the tensile strength of 767MPa， the yield strength of 588MPa， the elongation after fracture of 22%， and the impact energy of 107J at 20℃.

Key words: 12Cr14Ni2 sorbite stainless structural steel; quenching temperature; heat treatment; microstructure; mechanical property

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