海洋石油平台用E40钢板的高温变形行为

摘要

在MMS-200型热模拟试验机上通过单道次压缩试验研究了海洋平台用E40钢板的高温变形行为及动态再结晶行为；确定了该钢理想的加热温度.结果表明:随着变形温度的升高,该钢的动态再结晶临界切应力呈减小的趋势；动态再结晶的开始温度在900～950℃范围内；850℃时真应力-真应变曲线下降的主要原因是应变诱导铁素体相变；900℃以上时真应力-真应变曲线的下降是动态再结晶所致；其理想的变形加热温度为1 200℃.%High temperature deformation behavior and dynamic recrystalization behavior of an E40 steel plate used for offshore platform were studied by single-pass compressive testing on MMS-200 hot simulation tester. A perfect austenization temperature for the tested steel was determined. The results show that critical shear stree for dynamic recrystalization decreased with the increase of deformation temperature. The start temperature for dynamic recrystalization varied in the range of 900-950℃. The true stress-true strain curve declined at 850℃, which could be explained by strain-induced ferrite transformation, and when deformation temperature was above 900 ℃,dynamic recrystalization led to true stress-true strain curve declining. Ideal deformation temperature of the steel was 1 200℃.