孙大智,李萍,林泉,华睿,薛克敏,吴玉程.多向锻造纯钨形变储存能及动态再结晶行为分析[J].稀有金属材料与工程,2018,47(3):937~942.[Sun Da-zhi,Li Ping,Lin Quan,Hua Rui,Xue Ke-min,Wu Yu-cheng.Analysis of deformation stored energy and dynamic recrystallization behavior of pure tungsten processed by multiple direction forging[J].Rare Metal Materials and Engineering,2018,47(3):937~942.]
多向锻造纯钨形变储存能及动态再结晶行为分析
投稿时间:2016-02-12  修订日期:2016-05-06
中文关键词:  多向锻造  形变储存能  位错  动态再结晶  大角度晶界
基金项目:教育部新世纪优秀人才支持计划(NCET-13-0765), 国际热核聚变实验堆计划(2014GB121000);
中文摘要:
      对纯钨烧结体进行多向锻造试验,运用OM和DSC分析了纯钨多向锻造组织演化规律及形变储存能的变化,结合XRD、EBSD对纯钨形变储存能的来源及动态再结晶行为进行了研究。结果表明:多向锻造后纯钨内部孔隙明显减少,热变形过程中的动态再结晶导致晶粒显著细化,变形后保留在晶粒及亚晶内部的高密度位错结构导致形变储存能的增加,再结晶晶粒主要沿能量较高的晶界及晶界交汇处分布,其动态再结晶机制为形变诱导晶界迁移机制与亚晶粗化及晶粒机械破碎的混合机制,多向锻造后纯钨再结晶温度基本不变,材料热稳定性有所提高。
Analysis of deformation stored energy and dynamic recrystallization behavior of pure tungsten processed by multiple direction forging
英文关键词:Multiple direction forging  deformation stored energy  dislocation  dynamic recrystallization  high-angle grain boundaries
英文摘要:
      Microstructure evolution and deformation stored energy change of sintered pure tungsten during multi-directional forging was investigated by OM and DSC. The source of deformation stored energy and dynamic recrystallization behavior of pure tungsten were studied with XRD and EBSD. The results indicate that dynamic recrystallization during hot deformation leads to remarkably grain refining with porosity significantly reduced. High-density dislocation structure retained in the grain and subgrain result in an increase in deformation stored energy after deformation. There are quantities of recrystallized grains distributed along the higher energy zone in grain boundaries and grain boundary Intersection. The mechanism of dynamic recrystallization is the mixture of deformation induced grain boundary migration mechanism with subgrain coarsening and grain mechanical fragmentation. The recrystallization temperature of pure tungsten unchanged substantially with thermal stability increased after multiple direction forging.
作者单位E-mail
孙大智 合肥工业大学材料科学与工程学院 sundz1991@126.com 
李萍 合肥工业大学材料科学与工程学院 li_ping@hfut.edu.cn 
林泉 合肥工业大学材料科学与工程学院  
华睿 安徽江淮汽车股份有限公司  
薛克敏 合肥工业大学材料科学与工程学院  
吴玉程 合肥工业大学材料科学与工程学院  
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