材料期刊网

INFLUENCE OF GRAIN SHAPE AND CARBIDE ON CREEP CRACK GROWTH IN HK40

ZHU Shijie Institute of Metal Research , Academia Sinica , Shenyang , China ZHAO Jie Fushun Institute of Petrochemistry , Fushun , China WANG Fugang Dalian University of Technology , Dalian , China Institute of Metal Research , Academia Sinica , Shenyang 110015

金属学报(英文版)

The influence of two different grain shapes and carbides in the HK40 alloy,the material for use of furnace tube,on the rate of creep crack growth has been investigated.The resistance to creep crack growth of the material with columnar grains is inferior than that with equiaxial grains when the load line is perpendicular to the columnar grain axis.The influence of secon- dary carbide on the rate of creep crack propagation depends upon the Brain shape.

关键词: grain shape , null , null

EFFECTS OF AGING TEMPERATURE AND TIME ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF AN Fe-BASE SUPERALLOY

GUO Shouren LU Dezhong GUO Jianting Institute of Metal Research , Academia , Shenyang , ChinaWU Xi Fushun Steel Works , Fushun , China Associate Professor , Institute of Metal Research , Academia Sinica , Shenyang 110015 , China

金属学报(英文版)

The mechanical properties and microstructure of an Fe-base superalloy GH35A have been examined after aging at 650—750℃ for 100—10000 h.The tensile strength of the alloy changes no more with aging temperature and the time at room temperature,but the ductility and impact toughness at room temperature,as well as the stress-rupture life up to 700℃ de- crease slowly during aging up to 10000 h The initiation time to worsen its properties becomes shorter as the aging temperature rises.The variation of the mechanical properties of the alloy was found mainly depending on the formation,morphology,distribution and characteristic of the σ-phase precipitation.

关键词: superalloy , null , null , null , null

Fushun Steel Plant

TANG Rongde Deputy-chief engineer. Fushun Steel Plant , Liaoning , China.

材料科学技术（英）

关键词:

EFFECT OF GRAIN REFINING ON FATIGUE-CREEP INTERACTION BEHAVIOURIN A Ni-BASE SUPERALLOY

YANG Wangyue ZHA NG Jishan CHEN Guoliang Beijing University of Science and Technology , Beijing , ChinaTIAN Shusen GENG Qingquan Fushun Steel Works , Fushun , Liaoning , China

金属学报(英文版)

The fatigue-creep interaction behaviour of superalloy GH698 with different grain sizes has been studied at 700℃.The results show that three zones,F,C and FC,can be distinguished at the fatigue-creep interaction curves.In zones FC and C,the presence of alternative stresses inhibits the creep deformation process therefore delays the fracture of the alloy.This effect will be enhanced by grain refining.However,in zone F,grain refining exhibits an inverse ef fect under large alternative stresses.

关键词: Ni-base alloy , null , null , null , null

The Behaviour of Mg in γ-phase in a Ni-base Superalloy

LI Zunwu LI Ping LIU Xianqi XIAO Wenchun Research Institute of Fushun Steel Works , Fushun , China.

材料科学技术（英）

关键词: Mg in γ'-phase , null