Influence of Ru Content on Microstructural Stability and Stress Rupture Property of DD15 Alloy

作     者：Zhenxue Shi Shizhong Liu Zhenxue Shi;Shizhong Liu

作者机构：Science and Technology on Advanced High Temperature Structural Materials LaboratoryBeijing Institute of Aeronautical MaterialsBeijing 100095China 

出 版 物：《Journal of Harbin Institute of Technology(New Series)》 (哈尔滨工业大学学报（英文版）)

年 卷 期：2023年第30卷第6期

页      面：29-34页

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：Sponsored by the National Science and Technology Major Project(Grant No.2017-VI-0002-0071) 

主　　题：DD15 alloy Ru element stress rupture life microstructure stability 

摘      要：A fourth generation single crystal(SC)nickel based cast superalloy DD15 with 1%Ru,3%Ru,5%Ru was prepared using vacuum induction single crystal furnace in order to optimize the properties and cost of DD15 *** exposure experiment of three alloys was conducted at 1100℃for 1000 *** stress rupture properties tests were performed at 1100℃temperature and 137 MPa *** composition optimization of Ru element in DD15 alloy had been *** was found that the alloys with different Ru contents all consist of cuboidalγ′phase embedded coherent inγ***γ′phase of the alloy all has a size of about 300-500 nm and a volume content of more than sixty *** dimension ofγ′precipitates is reduced and uniform with increase of Ru *** element can reduce the distribution ratio of high melting point element,so the microstructural stability is enhanced with Ru content *** topologically close-packed(TCP)phase precipitated in the 5%Ru alloy even after 1000 h *** stress rupture life of the alloy is significantly improved as Ru content *** raft breadth decreases slightly as Ru content *** specimen with 1%Ru and 3%Ru exhibits the presence of TCP phases and without TCP phases precipitated in fracture specimen with 5%*** density and integrity ofγ/γ′interfacial dislocation network increase as Ru content of the alloy rises.