5CrNiMoV钢马氏体相变塑性和应力对其相变动力学的影响

doi:10.13251/j.issn.0254-6051.2020.11.045

金属热处理 ›› 2020, Vol. 45 ›› Issue (11): 232-238.DOI: 10.13251/j.issn.0254-6051.2020.11.045

5CrNiMoV钢马氏体相变塑性和应力对其相变动力学的影响

彭旭, 卜恒勇, 李萌蘖, 郑善举

昆明理工大学材料科学与工程学院, 云南昆明 650093

收稿日期:2020-04-14 出版日期:2020-11-25 发布日期:2020-12-29
通讯作者: 李萌蘖,教授,博士,E-mail:limengnie@kust.edu.cn
作者简介:彭旭(1996—),男,硕士研究生,主要研究方向为材料加工集成计算材料工程,E-mail:1247780292@qq.com。
基金资助:
科技部重点研发计划(2017YFB0701804);昆明理工大学分析测试基金(2019M20172130076)

Transformation plasticity of martensite of 5CrNiMoV steel and effect of stress on its kinetics

Peng Xu, Bu Hengyong, Li Mengnie, Zheng Shanju

Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming Yunnan 650093, China

Received:2020-04-14 Online:2020-11-25 Published:2020-12-29

摘要/Abstract

摘要： 利用DIL-805ADT动态相变膨胀仪测定了5CrNiMoV钢在低于奥氏体屈服强度的应力下的马氏体相变膨胀曲线,根据膨胀曲线分析并计算出了不同应力下Greenwood-Johnson相变塑性机制中的相变塑性系数k值和Koistinen-Marburger马氏体相变动力学模型中α和Ms的值,并且将Greenwood-Johnson模型和Leblond模型计算结果与实际试验值对比。结果显示:k值随应力的变化有所波动,但趋近于一个定值;通过对比,Leblond模型更符合试验结果;Ms点随着应力的增大呈现微小的上升趋势,说明小于或等于80 MPa 的应力对Ms点的影响不显著;拉应力下α值普遍大于无应力下的α值,压应力下α值普遍小于无应力下的α值,说明拉应力对相变有一定的促进作用,压应力对相变有一定的阻碍作用。

关键词: 5CrNiMoV钢, 马氏体相变, 相变塑性, 相变动力学

Abstract: Axial expansion and contraction martensite transformation in 5CrNiMoV steel under uniaxial stresses lower than the yield strength of austenite were measured by means of DIL-805ADT dynamic dilatometer. Kinetic constants α and Ms in the Koistinen-Marburger equation for martensite transformations were simultaneously determined along with the transformation plasticity coefficient k in Greenwood-Johnson transformation mechanism from the dilation data. Transformation plasticity coefficient and the Greenwood-Johnson model and Leblond model calculation results were compared with the actual test values. The result is that the value of k fluctuates with the change of stress, but approaches a fixed value. The Leblond model is more in line with the test results by contrast. The Ms shows a slight upward trend with the increase of stress, and it shows that the effect of stress lower than or equal to 80 MPa on the Ms is not significant.The α under tensile stress is slightly higher than that under no stress, and α under compressive stress is slightly lower than that under no stress, indicating that tensile stress promotes transformation and compressive stress hinders transformation.

Key words: 5CrNiMoV steel, martensite transformation, transformation plasticity, transformation kinetics

中图分类号:

TG142.33

彭旭, 卜恒勇, 李萌蘖, 郑善举. 5CrNiMoV钢马氏体相变塑性和应力对其相变动力学的影响[J]. 金属热处理, 2020, 45(11): 232-238.

Peng Xu, Bu Hengyong, Li Mengnie, Zheng Shanju. Transformation plasticity of martensite of 5CrNiMoV steel and effect of stress on its kinetics[J]. Heat Treatment of Metals, 2020, 45(11): 232-238.

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5CrNiMoV钢马氏体相变塑性和应力对其相变动力学的影响

Transformation plasticity of martensite of 5CrNiMoV steel and effect of stress on its kinetics

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