双相不锈钢各组相循环变形行为的纳米压痕试验和有限元表征方法研究

doi:10.3901/JME.2020.22.090

机械工程学报 ›› 2020, Vol. 56 ›› Issue (22): 90-100.doi: 10.3901/JME.2020.22.090

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双相不锈钢各组相循环变形行为的纳米压痕试验和有限元表征方法研究

郭素娟¹, 史艳茹¹, 贾云飞¹, 赵剑²

1. 华东理工大学承压系统与安全教育部重点实验室上海 200237;
2. 同济大学航空航天与力学学院上海 200092

收稿日期:2020-06-16 修回日期:2020-09-11 出版日期:2020-11-20 发布日期:2020-12-31
通讯作者: 赵剑(通信作者),男,1984年出生,博士,助理教授。主要研究方向为复合材料与非均匀材料和结构的有限元分析和试验验证。E-mail:zhaojian@tongji.edu.cn
作者简介:郭素娟,女,1982年出生,博士。主要研究方向为过程设备结构完整性。E-mail:sujuanguo@ecust.edu.cn
基金资助:
国家自然科学基金（11872181）、上海市自然科学基金（20ZR1462600，18ZR1408900）和航空科学基金（201909038001）资助项目。

Nanoindentation Experiment and Finite Element Characterization of the Cyclic Deformation Behavior of Duplex Stainless Steel

GUO Sujuan¹, SHI Yanru¹, JIA Yunfei¹, ZHAO Jian²

1. Key Laboratory of Pressure System and Safety Ministry of Education, East China University of Science and Technology, Shanghai 200237;
2. School of Aerospace Engineering and Applied Mechanics, Tongji University, Shanghai 200092

Received:2020-06-16 Revised:2020-09-11 Online:2020-11-20 Published:2020-12-31

摘要/Abstract

摘要： 对双相不锈钢的奥氏体相和铁素体相，分别开展了不同加载模式（接触载荷和压入位移）和不同加载波形下的单向、循环纳米压痕试验，对比分析了两相的基本力学性能和压痕循环变形行为的演化规律。基于压痕试验结果和修正ABDEL-KARIM-OHNO非线性随动硬化准则的弹塑性本构模型，提出一套双相不锈钢奥氏体相和铁素体相的塑性和循环塑性行为的本构模型参数表征方法。通过对微结构代表性体积单元整体拉伸和循环变形行为进行模拟，并与宏观试验结果对比，验证了参数表征方法的合理性。研究结果表明，铁素体相的强度、硬度和抗棘轮变形的能力均高于奥氏体相，两相之间通过晶界产生一定的交互作用；在接触载荷控制的循环加载条件下，奥氏体相与铁素体相均产生明显的压痕棘轮现象，且载荷水平越高压痕棘轮变形程度越大；所发展的本构模型参数表征方法可为研究多相材料各组相、小体积材料的循环变形行为提供借鉴和参考。

关键词: 双相不锈钢, 纳米压痕, 塑性, 循环塑性, 循环本构参数

Abstract: The basic mechanical properties and the cyclic indentation deformation behavior of the austenitic and ferrite phases of duplex stainless steel are discussed and compared through the monotonic and cyclic nanoindentation experiments with different loading modes (indentation load and displacement controlled) and different loading waveforms. Based on the indentation experiment results and the elastoplastic constitutive model combined with modified ABDEL-KARIM-OHNO nonlinear dynamic hardening rule, a constitutive model parameter characterization method for the plastic and cyclic plastic behavior of austenite and ferrite phases in duplex stainless steel is developed. The rationality of the parameter characterization method is verified by simulating the overall tensile and cyclic deformation behavior of the representative volume unit of duplex stainless steel, and comparing with the macroscopic experimental results. It is shown that the strength and hardness of the ferrite phase are higher than those of the austenite phase, and the two phases have a certain interaction through the grain boundary. Both the austenite phase and the ferrite phase exhibit obvious indentation ratcheting phenomenon under cyclic indentation loadings, while the ratcheting deformation increases with loading levels. The developed constitutive model parameter characterization method can provide reference for studying the cyclic deformation behavior of each phase of multiphase materials and small-volume materials.

Key words: duplex stainless steel, nano-indentation, plasticity, cyclic plasticity, parameters of cyclic constitutive model

中图分类号:

TB331

郭素娟, 史艳茹, 贾云飞, 赵剑. 双相不锈钢各组相循环变形行为的纳米压痕试验和有限元表征方法研究[J]. 机械工程学报, 2020, 56(22): 90-100.

GUO Sujuan, SHI Yanru, JIA Yunfei, ZHAO Jian. Nanoindentation Experiment and Finite Element Characterization of the Cyclic Deformation Behavior of Duplex Stainless Steel[J]. Journal of Mechanical Engineering, 2020, 56(22): 90-100.

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双相不锈钢各组相循环变形行为的纳米压痕试验和有限元表征方法研究

Nanoindentation Experiment and Finite Element Characterization of the Cyclic Deformation Behavior of Duplex Stainless Steel

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