【作者】 苑少强； 杨跃辉； 郁春锋； 李敬； 张晓娟；

【Author】 YUAN Shaoqiang;YANG Yuehui;YU Chunfeng;LI Jing;ZHANG Xiaojuan;Department of Electromechanical Engineering,Tangshan College;Greatwall Drilling Company of CNPC;

【机构】 唐山学院机电工程系； 中国石油长城钻探工程有限公司；

【摘要】 利用热模拟技术、金相观察及透射电子显微术(TEM),对Fe-40Ni-Ti奥氏体模拟合金850℃变形后等温松弛过程中的应力松弛曲线、微观组织及亚结构演化进行了测试及观察,实验结果表明:实验合金的应力值在松弛过程中的各个阶段均高于无Ti的模拟合金,松弛200s时,观察到有再结晶发生,1000s时晶界周边出现大量的再结晶小颗粒。同时,松弛过程中位错由混乱的状态向多边形结构演化,1000s时出现完整的位错胞,未溶解的TiN析出质点在一定程度上阻碍了再结晶的发生。更多还原

【Abstract】 The thermo-simulation test,metallographic observation and transmission electron microscopy(TEM) were applied to investigate the relaxation curves,microstructures and evolution of dislocation configuration behavior during relaxation at 850 ℃ in deformed Fe-40Ni-Ti alloy.The experimental results demonstrate that:the stress of tested alloy has higher values than that the Ti free simulation alloy during the whole relaxation process.When the relaxing time reaches 200 s,the recrystallization occurs.A large numbers of micro-grains of recrystallization can be observed around the original grains for 1000 s.At the same time,the twisted dislocations formed during the deformation develop into polygon structures and finally,the perfect dislocation cells can be observed when relaxing to 1000 s.The undissolved precipitates of TiN retards the progress of recrystallization to some extent.更多还原