变形速率对2205双相不锈钢形变诱导相变的影响

Influence of Deformation Rate on Strain-Induced Phase Transition of 2205 Duplex Stainless Steel

通过单道次压缩热模拟试验,研究了2205双相不锈钢在热变形过程中组织组成相奥氏体相(γ)和铁素体相(δ)所占比例的变化情况.分析得到:2205双相不锈钢在热变形过程中存在奥氏体相和铁素体相之间的相互转变,且热变形过程中发生的两相之间的相互转变也是2205双相不锈钢热变形过程中的一种动态软化机制.变形速率对2205双相不锈钢热变形过程中发生的相转变的影响规律为:变形速率很小时,δ→γ的转变占较大比重;随着变形速率的升高,γ→δ所占比例增加.

The change of phase proportion of the austenite（γ）and ferrite（δ）in the microstructure of 2205 duplex stainless steel during thermal deformation was investigated by single-pass reduction simulation.The results showed that there are not only the phase transition between austenite and ferrite but also a dynamic softening mechanism due to the transition during thermal deformation of the stainless steel.The influence of deformation rate on phase transition during thermal deformation was found in such a way that the δ-γ transition is dominant if the deformation rate is very small, but the portion of γ-δtransition increases with increasing deformation rate.