钢锭内部孔隙性缺陷锻合过程的数值模拟  

Simulation of void closure in ingots during forging

作　　者：陈锟[1,2] 杨弋涛[1] 邵光杰[1] 

机构地区：[1]上海大学材料科学与工程学院,上海200072 [2]上海应用技术学院材料科学与工程学院,上海200235

出　　处：《塑性工程学报》2010年第1期6-10,共5页Journal of Plasticity Engineering

基　　金：国家科技支撑计划资助项目(2007BAE51B04)

摘　　要：通过比较圆柱体试样内部孔洞锻合过程的模拟计算结果和实验结果,确立了钢锭内部孔隙性缺陷锻合过程的模拟法,并对长孔型缺陷和短孔型缺陷的锻合过程进行了计算,得到各类孔洞的闭合规律,且定量给出了不同位置处孔洞闭合时所需的临界压下率。从孔洞闭合的力学本质角度,对钢锭内部的等效应变分布情况进行了研究。结果表明,孔洞的闭合完全是由于应力集中并达到一定程度的变形所引起的。其中,四面体孔最难闭合,为所有孔洞锻合所需临界压下率的上限值。锻合区域的给出,为制订锻造工艺提供了理论依据。Simulation method of void closure in ingots during forging was determined by comparing simulated and experimental resuits of void closure in the cylinder specimens during forging. Calculation was performed for void closure of long and short defects during forging by this method, law of void closure was obtained, and critical percent reduction for void closure at different locations were quantitatively presented. Additionally, distribution of equivalent strain in ingots was studied, from the view of mechanics essence of void closure. Results indicate that void closure is happened due to stress concentration and when deformation reaching a certain degree. The closure of tetrahedral void with the critical reduction value reaching the upper limit for void closure during forging is the most difficult one. The closure region given provide theoretical basis for formulating forging process.

关 键 词：孔隙性缺陷 锻合区域 模拟法 应力集中 

分 类 号：TG316[金属学及工艺—金属压力加工]