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总览 评价 郭素娟 * ， 崔元元 （ 华东理工大学机械与动力工程学院,上海 200237； ） 摘要： 基于纳米压痕技术,对双相不锈钢奥氏体相和铁素体相的局部变形行为进行了实验研究。首先，通过位移控制的单向压痕实验，讨论了奥氏体相和铁素体相的基本力学性能及
郭素娟*， 崔元元
（
华东理工大学机械与动力工程学院,上海 200237； ）
摘要：
基于纳米压痕技术,对双相不锈钢奥氏体相和铁素体相的局部变形行为进行了实验研究。首先，通过位移控制的单向压痕实验，讨论了奥氏体相和铁素体相的基本力学性能及差异；之后，通过增量加载法，讨论了奥氏体相和铁素体相在加卸载循环载荷下的压入深度演化特点及其在峰值保载下的压痕蠕变行为；最后，讨论了奥氏体相和铁素体相在力控制的循环载荷下压入深度随循环周次的演化特征和载荷水平依赖性。研究成果为提高对双相不锈钢相关组件的整体力学性能的描述精度和安全性能预测水平提供微观机制方面的支持。
关键词：
双相不锈钢；纳米压痕技术；基本力学特性；循环变形行为
Sujuan Guo*， Yuanyuan Cui
（
School of Mechanical and Power Engineering,East China University of Science and Technology，Shanghai200237； ）
Abstract：
Based on the technology of the nano-indentation, the basic mechanical properties and cyclic deformation behavior of the austenite phase and ferrite phase in an austenitic-ferritic duplex stainless steel was studied. Firstly, from the displacement monotonic indentation experiment, the differences between the basic mechanical properties of austenite phase and ferrite phase are compared. Then, with the incremental load controlled loading-unloading conditions applied, the indentation depth evolution rule and the indentation creep behavior was studied. Finally, with the load controlled cyclic indentation experiments being conducted, the cyclic evolution rule of displacement into surface were observed, and the influence of different load level on the micro cyclic deformation behavior of each phase were discussed.
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