| 5CrNiMoV钢马氏体相变塑性和应力对其相变动力学的影响 |
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| 引用本文： | 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. |
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| 作者姓名： | 彭旭 卜恒勇 李萌蘖 郑善举 |
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| 作者单位： | 昆明理工大学 材料科学与工程学院, 云南 昆明 650093 |
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| 基金项目： | 科技部重点研发计划;昆明理工大学分析测试基金 |
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| 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。
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| 关 键 词： | 5CrNiMoV钢 马氏体相变 相变塑性 相变动力学 |
| 收稿时间： | 2020-04-14 |
Transformation plasticity of martensite of 5CrNiMoV steel and effect of stress on its kinetics |
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| 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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| Authors: | Peng Xu Bu Hengyong Li Mengnie Zheng Shanju |
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| Affiliation: | Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming Yunnan 650093, China |
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| 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. |
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| Keywords: | 5CrNiMoV steel martensite transformation transformation plasticity transformation kinetics |
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