摘要
设计了成分与SAF2205双相不锈钢中奥氏体相和铁素体相成分相近的单相奥氏体不锈钢和铁素体不锈钢,根据其应力-应变曲线,采用有限元方法,计算了双相不锈钢的应力-应变曲线,并与实测值进行对比,同时对奥氏体的体积分数和双相不锈钢中两相屈服强度之比(C*)等影响双相不锈钢力学性能的因素进行了讨论。由单相奥氏体和铁素体不锈钢的应力-应变曲线计算的双相不锈钢的应力-应变曲线和实测的双相不锈钢应力-应变曲线吻合很好,说明本文所建立的有限元模型正确。计算表明奥氏体体积分数对应力-应变曲线的弹性部分没有影响,而对塑性部分影响较大。在外应力作用下,随着奥氏体体积分数的增加,应变增加;不同奥氏体与铁素体屈服强度之比(C*)对应力-应变曲线弹性部分没有影响,而对塑性部分略有影响,在外加应力作用下,随着C*增加,应变增加。
In order to simulate stress-strain curve of duplex stainless steel, the austenite and ferrite stainless steels with single phase, whose compositions are similar to those of austenite and ferrite in SAF 2205 duplex stainless steel, were designed. The stress-strain curve of the duplex stainless steel was calculated with ANSYS finite element (FE) software, and compared with the measured one. The effects of the volume fraction of austenite and the ratio of austenite and ferrite yield stress on mechanical properties of the duplex stainless steel were discussed. The calculated stress-strain curve of duplex stainless steel based on that of single phase austenite and ferrite stainless steel is coincident, with the measured one very well. The volume fraction of austenite affects plastic deformation behavior of the duplex stainless steel. With increasing of volume fraction of austenite, the strain can be increased greatly for same applied stress. The yield stress ratio (C*) between austenite and ferrite in duplex strainless steel also affects its plastic deformation behavior. With the increasing of C*, the strain can be increased slightly for same applied stress.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2005年第5期124-128,共5页
Transactions of Materials and Heat Treatment
基金
教育部回国留学基金
关键词
双相不锈钢
应力-应变曲线
数值模拟
有限元模型
Computer simulation
Finite element method
Mechanical properties
Plastic deformation
Strain
Stresses
Yield stress
