热压缩变形不均匀性的有限元模拟与试验研究.pdfVIP

第 42卷 第12期 钢 铁 Vo1．42，No．12 2 0 0 7年 12月 Iron and Stee1 December 2007 热压缩变形不均匀性的有限元模拟与试验研究 吕知清， 赵 军， 王振华， 任利国， 傅万堂 (燕山大学亚稳材料制备技术与科学国家重点实验室，河北 秦皇岛066004) 摘 要：用FEM方法对一种共析珠光体钢经700℃、0．1～10 S 的热压缩变形过程进行了数值模拟，分析了变形 后试样纵剖面上等效应变与应变速率的分布情况，确定了实际变形条件与试验设定条件比较一致的区域范围，并 通过相应的显微组织变化进行了验证。结果表明，热压缩变形试样心部的等效应变与应变速率比设定值大4O 左 右，而端面值则为设定值的1／5~1／4；在从试样端面到中心距离的2／5~3／5区域内，实际应变及应变速率与试验 设定的变形条件基本一致，且1／2处一致性最好。 关键词：热压缩；变形不均匀性；有限元分析；显微组织 中图分类号：TG142．1 文献标识码：A 文章编号：0449—749X(2007)12—0053—04 FEM Analysis and Experimental Study 0f Deformation Nonuniformity After H0t Compression LU Zhi—qing， ZHAO Jun， WANG Zhen-hua， REN Li—gou， FU Wan—tang (State Key Laboratory of Metastable Materials Science and Technology，Yanshan University，Qinhuangdao 066004，Hebei，China) Abstract：The hot compression of an eutectoid pearlite steel at 700℃ was simulated with finite element method (FEM)at a strain rate from 0．1 tO 10．0 S ．The distribution of efficient strain and strain rate in axial section of deformed samples was analyzed．The coincident region of practical with set conditions was determined and approved by metallographic examination．The results indicate that the efficient strain and strain rate are higher by about 4O than in the center of deformed samples，but are about 1／5—1／4 of set values at the end surface；The practical strain and strain rate accord with the set values at 2／5—3／5 distance from the end surface to the center of deformed sample， and the consistency between practical and set values is reached at 1／2 distance from the end surface tO the center． Key words：hot compression；deformation nonuniformity；FEM analysis；microstructure 利用热加工试验机对金属材料实际轧制、锻造、 异或者说变形不均