抽拉速率对DZ951合金组织和性能的影响  

Effects of Withdrawal Rate on Microstructure and Properties of DZ951 Superalloy

作　　者：高成薇[1,2] 于金江[1] 孙长波[2] 孙晓峰[1] 

机构地区：[1]中科院金属研究所,辽宁沈阳110016 [2]中航工业沈阳黎明航空发动机(集团)有限责任公司,辽宁沈阳110043

出　　处：《铸造》2012年第3期246-250,共5页Foundry

基　　金：国家重点基础研究发展计划(973计划)项目(2010CB631200);国家自然科学基金重点资助项目(50931004);中国科学院面上基金项目(11M42)

摘　　要：系统研究了抽拉速率对DZ951合金组织和性能的影响。试验结果表明:随着抽拉速率的增大,合金的定向凝固组织由粗枝状晶向细枝状晶演变,γ′相体积分数没有明显的变化但尺寸有所减小,而γ′相的形状逐渐趋向于规则立方;共晶含量、疏松水平和偏析程度都随抽拉速率的增加而变大;拉伸强度和伸长率都呈现出先减小而后增大的趋势。The microstructure and mechanical property of directionally solidified DZ951 superalloy produced at different withdrawal rate were investigated. Experimental results show that the microstructure of DZ951 directionally solidified sample transforms from coarse dendrite to fine dendrite with the increase of withdrawal rate. The size of the γ′particles decreases, the shape tends to be more regular and the volume fraction increases insignificantly. The volume fraction of γ/γ′＇ eutectic, porosity and segregations increase with the increase of withdrawal rate. Nevertheless the tensile strength and elongation of DZ951 alloy firstly decrease and then increase with the increase of withdrawal rate.

关 键 词：DZ951合金 抽拉速率 组织 拉伸性能 

分 类 号：TG132.32[一般工业技术—材料科学与工程]