波纹管成型用薄板在不同热处理条件下组织和性能研究

Study on Microstructure and Properties of Sheet for Bellows Corrugation Under Different Heat Treatment Conditions

文中对波纹管用薄板进行了20%、40%和60%的预伸长后,分别进行了600℃和900℃的热处理。结合上述性能测试结果和波纹管成型时的形变量,选取20%和25%的变形后,分别进行750℃和850℃的热处理,并测试其性能和显微组织。随着预伸长量的增加,晶粒碎化,马氏体增加,其强度升高,塑性下降;随着热处理温度的升高,形变储能、内应力和马氏体都随之减少,900℃热处理后,强度出现明显下降,塑性改善。20%和25%的变形后,分别进行750℃和850℃的热处理后,实现了细晶强化,其强度高,塑性好,性能较优。

After conducting pre-elongation of 20%、40%and 60%for bellows sheet in this paper,heat-treatment was carried on at 600℃and 900℃respectively.Combined with above performance test results and the deformation of the bellows,20%and 25%of the deformed bellows were selected for heat treatment at 750℃and 850℃respectively,and the properties and microstructure were tested.With the increasing of pre-elongation,the grain fragmentation and martensite increased.The values of strength increased,but the plasticity decreased.As heat treatment temperature increased,the deformation energy storage,internal stress and martensite all decreased.After the heat treatment at 900℃,the values of strength dropped obviously and plasticity improved.After the deformation of 20%and 25%,grain strengthening was realized,high strength and good plasticity were obtained under 750℃and 850℃heat treatment respectively,and the performance is good.