热等静压对K445高温合金组织及力学性能的影响  

Effect of Hot Isostatic Pressing on High Temperature Alloy Structure and Mechanical Properties of K445 Superalloy

作　　者：贺群功 徐永锋[1,2] 李林蓄[1,2] 刘俊[1,2] 

机构地区：[1]东方汽轮机有限公司材料研究中心,四川德阳618000 [2]长寿命高温材料四川省重点实验室,四川德阳618000

出　　处：《装备制造与教育》2016年第4期55-59,共5页Equipment Manufacturing and Education

摘　　要：研究了热等静压处理前后的K445合金精密铸造试样微观组织形貌和力学性能。结果表明,经过热等静压（HIP）处理后,显微疏松基本消除,合金密度提高了0.19%~0.25%;共晶数量减少,尺寸减小,γ＇相形态更加规则;韧性得到提高,冲击功从7.0J^9.0J升高到9.5J^11.0J;在750℃~900℃时,抗拉强度提高了4.7%~17%,屈服强度提高了5.8%~19%,塑性得到改善。Microstructures and mechanical properties of K445 superalloy samples made by investment castings before and after hot isostatic pressing treatment（HIP） have been investigated. The results reveal that： after HIP treatment, micro- porosity has been almost removed and the density rises by 0.19%~0.25%; the number of eutectic becomes less and the size gets smaller, and the shape of γ＇ phase is also more regular; the toughness increases and the impact energy rises from 7.0J ~ 9.0J to 9.5J ~ 11.0J; at 750℃ ~ 900℃, the tensile strength is increased by4.7% ~ 17%, the yield strength is increased by 5.8% ~ 19%, and the plasticity is also improved.

关 键 词：热等静压 镍基高温合金K445 显微疏松 力学性能 

分 类 号：TG136.1[一般工业技术—材料科学与工程]