A mechanism-based elasto-viscoplastic constitutive model for the creep deformation of martensitic heat-resistant steels

IF 1.5 4区 工程技术 Q3 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS
Jundong Yin, Baoyin Zhu, Runhua Song, Chenfeng Li, Dongfeng Li
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引用次数: 0

Abstract

Purpose

A physically-based elasto-viscoplastic constitutive model is proposed to examine the size effects of the precipitate and blocks on the creep for martensitic heat-resistant steels with both the dislocation creep and diffusional creep mechanisms considered.

Design/methodology/approach

The model relies upon the initial dislocation density and the sizes of M23C6 carbide and MX carbonitride, through the use of internal variable based governing equations to address the dislocation density evolution and precipitate coarsening processes. Most parameters of the model can be obtained from existing literature, while a small subset requires calibration. Based on the least-squares fitting method, the calibration is successfully done by comparing the modeling and experimental results of the steady state creep rate at 600° C across a wide range of applied stresses.

Findings

The model predictions of the creep responses at various stresses and temperatures, the carbide coarsening and the dislocation density evolution are consistent with the experimental data in literature. The modeling results indicate that considerable effect of the sizes of precipitates occurs only during the creep at relatively high stress levels where dislocation creep dominates, while the martensite block size effect happens during creep at relatively low stress levels where diffusion creep dominates. The size effect of M23C6 carbide on the steady creep rate is more significant than that of MX precipitate.

Originality/value

The present study also reveals that the two creep mechanisms compete such that at a given temperature the contribution of the diffusion creep mechanism decreases with increasing stress, while the contribution of the dislocation creep mechanism increases.

马氏体耐热钢蠕变变形的基于机理的弹塑性-粘塑性构成模型
设计/方法/方法该模型依赖于初始位错密度以及 M23C6 碳化物和 MX 碳氮化物的尺寸,通过使用基于内部变量的控制方程来解决位错密度演变和沉淀粗化过程。模型的大部分参数可从现有文献中获得,只有一小部分需要校准。基于最小二乘法拟合方法,通过比较 600° C 时在各种施加应力下的稳态蠕变速率的建模和实验结果,成功地完成了校准。模型结果表明,只有在位错蠕变占主导地位的相对较高应力水平的蠕变过程中,析出物尺寸才会产生相当大的影响;而在扩散蠕变占主导地位的相对较低应力水平的蠕变过程中,马氏体块尺寸会产生影响。M23C6 碳化物的尺寸对稳定蠕变速率的影响比 MX 沉淀的影响更为显著。本研究还揭示了两种蠕变机制的竞争关系,即在给定温度下,扩散蠕变机制的贡献随应力的增加而减少,而位错蠕变机制的贡献则增加。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Engineering Computations
Engineering Computations 工程技术-工程:综合
CiteScore
3.40
自引率
6.20%
发文量
61
审稿时长
5 months
期刊介绍: The journal presents its readers with broad coverage across all branches of engineering and science of the latest development and application of new solution algorithms, innovative numerical methods and/or solution techniques directed at the utilization of computational methods in engineering analysis, engineering design and practice. For more information visit: http://www.emeraldgrouppublishing.com/ec.htm
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