【摘要】 目前,对2205双相不锈钢(2205DSS)在疲劳载荷下的相结构演变还缺乏报道。对2205DSS双相不锈钢进行了高周疲劳试验,采用面积统计法测定了铁素体、奥氏体及其两相比,研究了应力幅值和循环周次对铁素体高周疲劳的影响,分析了疲劳诱发的相变机理,探讨了高周疲劳对2205DSS相变行为的影响。结果表明:随着应力幅值和循环周次的增加,2205DSS双相不锈钢中奥氏体逐渐减少,铁素体及其与奥氏体的比逐渐增加;两相具有不协调变形能力,循环载荷在相界处产生局部应力集中以及累积应变能增加,是促进碳原子发生上坡扩散并诱发界面向奥氏体方向移动的原因。更多还原

【Abstract】 High cycle fatigue experiments were performed on 2205 duplex stainless steel(DSS) specimen,and area statistics method was used to determine the ratio of two phases of ferrite and austenite. The effects of stress amplitude and cyclic time on the microstructure and the duplex ratio were investigated. The mechanism of fatigue induced phase transition was analyzed. Furthermore,the effect of high cycle fatigue on the phase transition behavior of 2205 DSS was explored. Results showed that with the increase of stress amplitude and cyclic time,the austenite phase in 2205 DSS gradually decreased,resulting in the increase of ferrite and the duplex ratio. Due to the incompatible deformation abilities of the duplex phases,the cycling loading caused the stress concentration on the duplex phases interface and the increase of accumulated strain energy,which was advantageous to the uphill diffusion of carbon atom neighboring the interface into the austenite and promoted the migration of interface boundary towards the austenite phase.更多还原