Influence of heat treatment on microstructure and tensile properties of conventionally cast and directionally solidified superalloy CM247LC

被引：46

作者：

Kim, I. S. ^{[1
]}

Choi, B. G. ^{[1
]}

Seo, S. M. ^{[1
]}

Kim, D. H. ^{[1
]}

Jo, C. Y. ^{[1
]}

机构：

[1] Korea Inst Mat Sci, High Temperature Grp, Chang Won, South Korea

来源：

MATERIALS LETTERS | 2008年 / 62卷 / 6-7期

关键词：

CM247LC; conventional cast; directionally solidified; tensile properties;

D O I：

10.1016/j.matlet.2007.07.058

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The influence of heat treatment on the evolution of gamma' and tensile properties of the conventionally cast (CC) and the directionally solidified (DS) superalloy CM247LC has been extensively investigated. The tensile strength of the CC and the DS alloys is dependent upon aging and solution treatment condition. In the case of the CC specimen, the aged condition (HTA condition) has higher strength than the solution treated and aged condition (HTSA condition) at low temperature (at and below 650 degrees C). On the contrary, HTSA specimen shows higher strength at high temperature (at and above 871 degrees C). Shearing of gamma' by coupled dislocations is a principal deformation process at the low temperature, and cutting of fine secondary gamma' plays an important role at an early stage of deformation in the CC specimen. The HTSA condition exhibits higher strength than HTA condition in the DS specimen in all temperature range. High tensile strength of the HTSA specimen at high temperature is found to be attributed to the rafting of gamma'. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：1110 / 1113

页数：4

共 8 条

[1] Role of secondary γ′ precipitation and of hydrogen in the first stage of the plastic deformation of the γ matrix of a Ni base superalloy single crystal [J].

Brass, AM ;

Roux, D ;

Chêne, J .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2002, 323 (1-2) :97-102

[2]

GIAMEI AF, 1985, HIGH TEMPERATURE ORD, V39, P293

[3]

Haung H. E., 2004, MAT T JAPAN, V45, P562

[4] Effect of heat treatment on microstructures and tensile properties of Ni-base superalloy M963 [J].

He, LZ ;

Zheng, Q ;

Sun, XF ;

Guan, HR ;

Hu, ZQ ;

Tieu, AK ;

Lu, C ;

Zhu, HT .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2005, 398 (1-2) :128-136

[5]

Kakehi K, 2000, MAT SCI ENG A-STRUCT, V278, P135, DOI 10.1016/S0921-5093(99)00579-1

[6] Increase of misfit during creep of superalloys and its correlation with deformation [J].

Link, T ;

Epishin, A ;

Brückner, U ;

Portella, P .

ACTA MATERIALIA, 2000, 48 (08) :1981-1994

[7] Creep behaviour of Ni-base single-crystal superalloys with various γ′ volume fraction [J].

Murakumo, T ;

Kobayashi, T ;

Koizumi, Y ;

Harada, H .

ACTA MATERIALIA, 2004, 52 (12) :3737-3744

[8] Investigation of creep deformation mechanisms at intermediate temperatures in Rene 88 DT [J].

Viswanathan, GB ;

Sarosi, PM ;

Henry, MF ;

Whitis, DD ;

Milligan, WW ;

Mills, MJ .

ACTA MATERIALIA, 2005, 53 (10) :3041-3057

← 1 →