Abstract : for analyzing the residual stress distributing state within the weld joint , and its effect on the performance of welding structure , when welding the ferrite pearlite steel with the austenite steel , this paper develops a finite element program to compute the interface stress of two or over two material . finally , this program is used to analyze the mechanical behavior of heterogenic joint 文摘:为了分析铁素体、珠光体类钢与奥氏体类钢焊接时,焊接接头处焊接残余应力的分布状态及其对焊接构件性能的影响,研制了可计算两种或两种以上材料界面应力的有限元程序,并用此程序分析了异质接头的力学行为。
( 4 ) which deformation behavior of cementite lamellae in pearlite colonies is closely related to the stress state of cementite which significantly depends on cementite thickness and orientation , especially on cementite thickness . ( 5 ) the lamellar cementite undergoes partial dissolution on the present deformation . the thermodynamical destability of cementite is attributed to a large number of defect in cementite introduced by severe plastic deformation providing evidence for cementite dissolution 而渗碳体的应力状态主要是与渗碳体的片层厚度和取向密切相关的,其中渗碳体的厚度起决定性作用; ( 5 )本实验变形条件下,渗碳体出现了部分溶解的现象,这是由于强烈塑性变形而在渗碳体中引入大量的缺陷导致其处于高能不稳定状态从而促使了渗碳体溶解。
The change regularity for performance and microstructure of low carbon steel is summarized . the main characteristic of the process is pearlite spheroidizing , increasing of grain boundary width , element segregation and carbide in grain boundary . the change of those microstructure causes the variance of the merchant performance 通过上述的研究工作,总结了火力发电厂用低碳钢在长期运行期间性能与微观结构的变化规律,提出以珠光体球化、晶界宽化、元素晶界偏聚及碳化物晶界析出为主要特征的低碳钢微结构变化规律,以及由此而引起的材料机械性能的变化。