金属热处理 ›› 2022, Vol. 47 ›› Issue (9): 245-249.DOI: 10.13251/j.issn.0254-6051.2022.09.042

• 材料研究 • 上一篇    下一篇

Ni含量对淬回火态40CrNiMo钢显微组织和力学性能的影响

关蕴奇1,2, 李亮1,2, 胡文祥1,2, 史正良1,2, 徐嘉1,2   

  1. 1.空调设备及系统运行节能国家重点实验室, 广东 珠海 519070;
    2.广东省制冷设备节能环保技术企业重点实验室, 广东 珠海 519070
  • 收稿日期:2022-04-18 修回日期:2022-07-27 发布日期:2022-10-18
  • 通讯作者: 胡文祥,硕士,E-mail: fishmanxm@126.com
  • 作者简介:关蕴奇(1992—),男,硕士,主要研究方向为钢铁材料及其热处理,E-mail: fk1219@126.com。
  • 基金资助:
    广东省基础与应用基础研究(2020A1515011386)

Effect of Ni content on microstructure and mechanical properties of quenched and tempered 40CrNiMo steel

Guan Yunqi1,2, Li Liang1,2, Hu Wenxiang1,2, Shi Zhengliang1,2, Xu Jia1,2   

  1. 1. State Key Laboratory of Air-conditioning Equipment and System Energy Conservation, Zhuhai Guangdong 519070, China;
    2. Guangdong Key Laboratory of Refrigeration Equipment and Energy Conservation Technology, Zhuhai Guangdong 519070, China
  • Received:2022-04-18 Revised:2022-07-27 Published:2022-10-18

摘要: 使用直读光谱仪、扫描电镜、X射线衍射仪和力学试验设备,研究了Ni含量对淬回火态40CrNiMo钢的显微组织、残留奥氏体含量、硬度、室温抗拉强度和室温冲击性能的影响。结果表明,随着Ni含量从1.346%增加至1.618%,40CrNiMo钢的显微组织、残留奥氏体含量无明显变化,但α-Fe的晶格畸变增大;在不同回火温度下,试验钢的硬度均提高5~10 HV;450 ℃回火的高Ni含量钢的抗拉强度比低Ni含量钢高78 MPa,抗拉强度的提高幅度则随着回火温度的升高而减小;然而在残留奥氏体含量几乎不变的条件下,Ni含量增加反而会使450、500 ℃回火后钢的冲击吸收能量降低约50%。

关键词: Ni含量, 40CrNiMo钢, 淬回火态, 显微组织, 力学性能

Abstract: Effect of Ni content on microstructure, volume fraction of retained austenite, hardness, tensile strength and impact property at room temperature of quenched and tempered 40CrNiMo steel was studied by means of OES, SEM, XRD and mechanical testing instruments. The results show that with the increase of Ni content from 1.346% to 1.618%, the microstructure and content of retained austenite have no obviously change, while the lattice distortion of α-Fe increases. The hardness of the tested steel tempered at different temperatures increases by 5-10 HV. The tensile strength of the high Ni content steel tempered at 450 ℃ is 78 MPa higher than that of the low Ni content steel, meanwhile the increase of tensile strength decreases with the increase of tempering temperature. However, under the condition that the retained austenite content is almost unchanged, the increase of Ni content reduces the impact absorbed energy of the steel tempered at 450 ℃ and 500 ℃ by about 50%.

Key words: Ni content, 40CrNiMo steel, quenched and tempered, microstructure, mechanical properties

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