熔体过热处理对DD98镍基单晶高温合金持久性能的影响  

Influence of melt over-heating treatment on stress rupture properties of DD98 Ni-based single crystal superalloy

作　　者：王震[1,2] 李金国[2] 金涛[2] 

机构地区：[1]中国刑事警察学院,辽宁沈阳110035 [2]中国科学院金属研究所,辽宁沈阳110016

出　　处：《金属热处理》2012年第4期48-51,共4页Heat Treatment of Metals

基　　金：国家自然科学基金(50171045)

摘　　要：研究了在不同熔体过热处理条件下一种镍基单晶高温合金的高温持久性能,并观察了持久断裂后的断口及变形组织。结果表明:随着熔体处理温度的提高和保温时间的加长,γ'筏型组织的完善程度增加,厚度减小;断口上韧窝数量、尺寸、形状均不同,显示出韧性断裂特征;热处理态单晶高温合金在1010℃,248 MPa下的高温持久寿命有大幅度提高、高温伸长率增加38.9%。The stress rupture characteristics of DD98 Ni-based single crystal superalloy by different melt over-heating treatments were investigated.The results show that with increasing of melt over-heating temperature and holding time,γ′ rafts become more perfect and their thicknesses are gradually decreased;stress rupture fracture reveals many dimples of different morphologies,quantity,size and shows ductile fracture mode;stress rupture life is improved gradually and elongation is enhanced about 38% under the condition of 1010 ℃,248 MPa.

关 键 词：镍基单晶高温合金 熔体过热处理 高温持久性能 

分 类 号：TG113.25[金属学及工艺—物理冶金]