长期时效对K416B合金组织与持久性能的影响  

Effect of long-term thermal exposure on microstructures and stress rupture properties of K416B alloy

作　　者：刘丽荣[1] 陈茂凯 胡颖涛 王振江[2] 谢君[2] LIU Li-rong;CHEN Mao-kai;HU Ying-tao;WANG Zhen-jiang;XIE Jun(School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110870,China;Institute of Metal Research of Chinese Academy of Sciences,Shenyang 110016,China;Foundry 16 Workshop,AECC Xi’an Aero-Engine Co.Ltd.,Xi’an 710021,China)

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110870 [2]中国科学院金属研究所,沈阳110016 [3]中国航发西安航空发动机有限公司铸造厂16车间,西安710021

出　　处：《沈阳工业大学学报》2022年第2期145-150,共6页Journal of Shenyang University of Technology

基　　金：国家自然科学基金项目(51701212,51571196,51771191);辽宁省自然科学基金项目(2019-MS-336).

摘　　要：为了考察K416B合金的组织稳定性及其对合金性能的影响,通过SEM、XRD与TEM等分析手段,研究了1000℃下长期时效对K416B合金的组织转变和1000℃/160 MPa条件下持久性能的影响.结果表明:随着时效时间的增加,K416B合金的γ′相尺寸增加;初生MC型碳化物逐渐转化为M_(6)C型碳化物,降低了合金的固溶强化作用;合金的持久寿命随时效时间的增加而降低,晶界处的颗粒状M_(6)C型碳化物数量及尺寸的增加是合金沿晶断裂的主要原因;针状M_(6)C型碳化物降低了合金的持久寿命,但对合金断裂特征的影响不明显.In order to investigate the microstructure stability of K416B alloy and its influence on mechanical properties,the effect of long-term thermal exposure at 1000℃on microstructure evolution and stress rupture property of K416B alloy at 1000℃/160 MPa was studied by SEM,XRD,TEM and some other characterization methods.The results show that the size ofγ′phase in K416B alloy increases with the duration of thermal exposure time.The primary MC carbides gradually transform into M_(6)C carbides and reduce the solid solution strengthening of alloy.The stress rupture life of alloy decreases with the duration of thermal exposure time.The increasing quantity and size of granular M_(6)C carbides at the grain boundary are responsible for the intergranular fracture behavior of alloy.The needle-like M_(6)C carbides reduce the stress rupture life,but have no significant effect on the fracture characteristics of alloy.

关 键 词：K416B镍基高温合金 长期时效 持久性能 断裂特征 碳化物 Μ相 γ′相 LSW理论 

分 类 号：TG132.3[一般工业技术—材料科学与工程]