机械振动对纯Al晶粒细化及凝固收缩的影响_王红霞.pdf

2007 1 铸 造 设 备 研 究 2007 2 RESEARCH STUD IES ON FOUNDRY EQU IPM ENT F eb. 2007 l 1 # # A l 1 2 1 1 , , , ( 1. 太原理工大学材料学院, 山西 太原 030024; 2太重集团铸锻公司铸钢厂, 山西 太原 030024 : 研究了振动场对纯 A l晶粒细 和凝固收缩的影响, 并着重进行理论分析实验结果表明: 振动 能明显细 晶粒, 改善收缩随着振动的加强, 纯A l 中心的等轴晶区逐渐增大, 边缘部位的柱状晶区逐渐减 小, 当振击力达到 8 1. 87N 时整 个试样端面全部变为等轴晶理论分析认为: 振动引起的强烈冲击和搅拌作 用使金属液产生晶粒游离增殖快速冷却是晶粒细 和收缩改善的根本原因 : 机械振动; 纯A l; 晶粒细 ; 凝固收缩 : TG 14 612 : A : 1004 - 646 178( 2007 01- 002 8- 03 E ffect of M echanical V ibration on G rain R efin em en t and Solid ification Sh rinkage of A lum inum 1 2 1 1 WAN G H ong-x ia , ZHAN G Guo-p ing , X U Chun-x iang , LIAN G We i ( 1. Taiyuan University of Science Technology, Shanxi Ta iyuan, 0 30024 , China; 2. TaiyuanH eavy Machinery (Group ) Casting orging Co., L td. Steel oundry, Shanxi Taiyuan, 030024, China) A bstrac t: The effect o fm echanical v ibration on g ra in ref inem ent and so lidif ication shrinkage o f a lum inum w as investigated in th is paper. T he results show that the g ra ins o f a lum inum obv iou sly are ref ined and the so lid if ica tion shr inkag e o f a lum inum is mi proved obv-i ou sly under the d ifferent v ibration streng th. W ith v ibration streng then ing, the zone o f equiax ed g ra in g radua lly increases and the zone of co lumn gra in gradua lly decreases. W hen the pow er of v ibration reached 81. 87N, the gra ins of a lum inum becam e equiax ed g ra in in full section of casting. A ccord ing to theoretical analysis, it w as indicate