PDF《第44 卷第 1 期》

收稿日期院2014-05-18曰 修订日期院2014-06-20 基金项目院A 计划(KZ101103114)曰航空支撑(KZ031105114) 作者简介院蒋帅(1988-)袁男袁硕士生袁主要从事激光加工方面的研究遥 Email: jiang_shuai2008@126.

com 导师简介院李怀学(1977-)袁男袁高级工程师袁博士袁主要从事激光增材制造及修复方面的研究遥 Email: [email protected] 热等静压对激光直接沉积 Ti60 合金组织与拉伸性能的影响 蒋帅1,李怀学

2 , 石志强

1 , 王玉岱

2 , 黄柏颖

2 , 周永强

1 (1. 中国石油大学(华东) 材料科学与工程系, 山东 青岛 266580;

2. 北京航空制造工程研究所, 北京 100024) 摘 要院 利用激光直接沉积技术成形 Ti60 合金, 研究热等静压―双重退火对激光直接沉积 Ti60 合金 缺陷、 组织及拉伸性能的影响.结果表明: 激光直接沉积 Ti60 合金存在气孔和未熔合两种缺陷, 经热 等静压处理后,气孔和尺寸较小的未熔合缺陷消除;

沉积态试样底部和中部为柱状晶,顶部为等轴 晶, 显微组织为魏氏组织, 由板条 琢 和板条间 茁 组成;

经热等静压―双重退火处理后, 晶界 琢 消融, 大 部分原始 茁 晶界消失, 琢 板条粗化, 长宽比减小, 显微组织变为网篮组织;

与锻件相比, 沉积态试样拉 伸强度较高, 塑性较低, 经热等静压―双重退火处理后, 其塑性达到了锻件标准. 关键词院 增材制造;

激光直接沉积;

钛合金;

Ti60;

热等静压 中图分类号院V261.8 文献标志码院 A 文章编号院 1007-2276(2015)01-0107-05 Effects of hot isostatic pressing on microstructure and tensile properties of direct laser deposited Ti60 alloys Jiang Shuai1 , Li Huaixue2 , Shi Zhiqiang1 , Wang Yudai2 , Huang Baiying2 , Zhou Yongqiang1 (1. Department of Materials Science and Engineering, China University of Petroleum, Qingdao 266580, China;

2. Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024, China) Abstract: Ti60 alloys were fabricated by using direct laser deposition (DLD) technology and it was studied that the effects of hot isostatic pressing (HIP) on defects, microstructure and tensile properties of the DLD Ti60 alloys. The results show that there are two typical kinds of defects in the DLD Ti60 alloys, which are pores and lack of fusion. After HIP treatment, pores and the small size of lack of fusion are eliminated. There are columnar crystals at the bottom and the middle of the as -deposited specimens, but at the top of the specimens are equiaxed grains. The microstructure is widmanstatten structure, which is composed of alpha laths and beta between the laths. After HIP and double annealing treatment, the grain boundary alpha melting, the most of the original beta grain boundaries disappear, alpha laths coarsening, the length -width ratio decreases, and the microstructure becomes basket -weave microstructure. Compared with the forgings, the as-deposited specimens have a high tensile strength with a low plasticity, after HIP and double annealing treatment, the plasticity of the as -deposited specimens exceeds the standards of the forgings. Key words: additive manufacturing;

direct laser deposition;

titanium alloy;

Ti60;

hot isostatic pressing 第44 卷第

1 期 红外与激光工程

2015 年1月Vol.44 No.1 Infrared and Laser Engineering Jan.2015 PDF 档案使用 pdfFactory Pro 试用版本建立 www.pdffactory.com 红外与激光工程 第44 卷0引言近年来袁 航空发动机压气机的工作温度已经达 到或超过