等温工艺对ZL205A废屑半固态再生组织的影响  

Effects of Isothermal Process on Semi-solid Recycled Microstructures of ZL205A Alloy Chips

作　　者：王明杰 杨勇 田微微[1] 张旭 王晔[1] 吉泽升[1] Wang Mingjie;Yang Yong;Tian Weiwei;Zhang Xu;Wang Ye;Ji Zesheng(School of Materials Science and Chemical Engineering,Harbin University of Science and Technology;Shoudu Aerospace Machinery Company;School of Materials Science and Engineering,Harbin Instituteof Technology)

机构地区：[1]哈尔滨理工大学材料科学与化学工程学院,哈尔滨150008 [2]首都航天机械公司,北京100071 [3]哈尔滨工业大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2022年第11期1396-1401,共6页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51801045);黑龙江省大学生创新创业训练计划资助项目(201810214025)。

摘　　要：为了在ZL205A合金半固态再生坯料中获得细小的球状晶粒,采用应变诱导激活法(Strain-Induced Melt Activation)处理半固态再生ZL205A合金废屑,研究了等温处理工艺对半固态再生坯料组织的影响,并进行了试验验证。结果表明,随着等温温度升高和等温时间延长,半固态坯料的平均晶粒尺寸呈先增后减再增的趋势,晶粒的形状也由圆整变为不规则再到圆整。最佳等温处理工艺为620℃×45 min,该参数下获得的半固态晶粒的平均晶粒尺寸为114μm,形状因子为1.12,固相率低于68%。In order to obtain the fine globular grains in semi-solid recycled billets, Strain-Induced Melt Activation(SIMA) process was carried out for ZL205 A alloy chips. The effects of SIMA process on microstructure of semi-solid billets were investigated and verified.The results indicate that with the increase of isothermal temperature and isothermal time, the average grain size of semi-solid billet is firstly increased, then decreased and finally increased, while the grain shape is transformed from roundness to irregularity to roundness again. In conclusion, the optimal process parameters is 620 ℃×45 min, where the average grain size and shape factor of ZL205 A alloy semi-solid microstructure are 114 μm and 1.12, respectively, and the solid fraction is lower than 68%.

关 键 词：ZL205A合金 半固态再生 微观组织 等温工艺参数 SIMA方法 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG249.9[金属学及工艺—金属材料]