金属热处理 ›› 2020, Vol. 45 ›› Issue (9): 116-120.DOI: 10.13251/j.issn.0254-6051.2020.09.021

• 工艺研究 • 上一篇    下一篇

回火温度对Nb微合金化NM500钢组织和性能的影响

徐慧, 李天生   

  1. 湖南工学院 工程训练中心,湖南 衡阳 421002
  • 收稿日期:2020-06-10 出版日期:2020-09-25 发布日期:2020-12-29
  • 作者简介:徐慧(1976—),女,副教授,硕士,主要研究方向为材料学、转子动力学,E-mail:342576943@qq.com.
  • 基金资助:
    国家级大学生创新创业计划项目(201911528005);湖南省自然科学基金(2020JJ6046,2019JJ60027);湖南省教育厅重点科研项目(19A127);衡阳市指导性计划项目(S2018F9031017249);机械设备健康维护湖南省重点实验室开放基金(201701)

Effect of tempering temperature on microstructure and mechanical properties of Nb microalloyed NM500 steel

Xu Hui, Li Tiansheng   

  1. Engineering Training Centre of Hunan Institute of Technology,Hengyang Hunan 421002,China
  • Received:2020-06-10 Online:2020-09-25 Published:2020-12-29

摘要: 对Nb微合金化NM500钢经过930 ℃淬火后分别在210、240、270和300 ℃的低温下进行回火,分析了不同回火温度对试验钢组织和力学性能的影响。采用SEM和TEM对不同回火温度下试验钢的微观组织形貌、冲击断口形貌及其强化机理进行了分析。结果表明:在930 ℃淬火,240 ℃回火时试验钢具有良好的综合力学性能,其强化机理为固溶强化、相变强化、沉淀强化和细晶强化的综合作用效果。

关键词: 回火温度, Nb微合金化, NM500钢, 强化机理

Abstract: Nb microalloyed NM500 steel was quenched at 930 9C and tempered at 210,240,270 and 300 C,respectively.Effects of tempering temperature on microstructure and mechanical properties of tested steel were analyzed.The microstructure,impact fracture morphology and strengthening mechanism of the tested steel tempered at different temperatures were studied by SEM and TEM.The results show that the tested steel has the best comprehensive mechanical properties when quenched at 930 C and tempered at 240 C,and the corresponding strengthening mechanism is a combination of solution strengthening,phase transformation strengthening,precipitation strengthening and fine grain strengthening.

Key words: tempering temperature, Nb microalloyed, NM500 steel, strengthening mechanism

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