粗晶DT4纯铁晶粒细化工艺研究  

Study on Grain Refinement Process of Coarse Graine DT4 Pure Iron

作　　者：江学强 吉卫[1] 曹海桥[1] 范啟超[1] JIANG Xueqiang;JI Wei;CAO Haiqiao;FAN Qichao(Institute of Mechanical Manufacturing Technology,China Academy of Engineering Physics,Mianyang 621900,China)

机构地区：[1]中国工程物理研究院机械制造工艺研究所,四川绵阳621900

出　　处：《热加工工艺》2019年第5期88-92,97,共6页Hot Working Technology

基　　金：中国工程物理研究院发展基金资助项目(2014B0203026)

摘　　要：纯铁晶粒一般非常大,通过大塑性变形后加热到再结晶温度可以实现晶粒细化。通过室温自由锻和等通道挤压(ECAP)实现了DT4纯铁的大塑性变形,将粗大不均匀晶粒破碎成微细亚结构,再经完全再结晶处理使DT4晶粒细化,晶粒度由原材料1级(晶粒直径约254μm)细化至8.5级(约18.9μm)。力学性能研究表明,细晶纯铁力学性能与粗晶纯铁的接近,晶粒细化对纯铁强化作用不明显。The grain size of pure iron is usually very large.Grain refinement can be realized by large plastic deformation and then heating to recrystallization temperature.Large plastic deformation of DT4 pure iron was realized by room temperature free forging and equal channel angular pressing(ECAP).The coarse and inhomogeneous grains were broken into fine substructures,and then the DT4 grains were refined by complete recrystallization.The grain size of DT4 was refined from grade 1(grain diameter about 254 μm)of raw material to grade 8.5(about 18.9 μm).The study of mechanical properties shows that the mechanical properties of the fine grain pure iron are close to those of the coarse grain pure iron,and the effect of grain refinement on the strengthening of the pure iron is not obvious.

关 键 词：粗晶纯铁 冷变形 晶粒细化 

分 类 号：TG306[金属学及工艺—金属压力加工]