Microstructural response to heat affected zone cracking of prewelding heat-treated Inconel 939 superalloy

被引：66

作者：

Gonzalez, M. A. ^{[1
]}

Martinez, D. I. ^{[1
]}

Perez, A. ^{[1
]}

Guajardo, H. ^{[2
]}

Garza, A. ^{[3
]}

机构：

[1] Fac Ingn Mecan & Elect FIME UANL, San Nicolas De Los Garza 66451, NL, Mexico

[2] FRISA Aerosp SA CV, Santa Caterina 66150, NL, Mexico

[3] Corporac Mexicana Invest Mat SA CV COMIMSA, Saltillo 25295, Coahuila, Mexico

来源：

MATERIALS CHARACTERIZATION | 2011年 / 62卷 / 12期

关键词：

Welding; Ni-based superalloy; Microstructure; SEM; Grain boundary; HAZ microfissuring; MECHANICAL-PROPERTIES; LIQUATION; NI3AL; REPAIR; HAZ;

D O I：

10.1016/j.matchar.2011.09.006

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The microstructural response to cracking in the heat-affected zone (HAZ) of a nickel-based IN 939 superalloy after prewelding heat treatments (PWHT) was investigated. The PWHT specimens showed two different microstructures: 1) spherical ordered gamma' precipitates (357-442 nm), with blocky MC and discreet M23C6 carbides dispersed within the coarse dendrites and in the interdendritic regions; and 2) ordered gamma' precipitates in "ogdoadically" diced cube shapes and coarse MC carbides within the dendrites and in the interdendritic regions. After being tungsten inert gas welded (TIG) applying low heat input, welding speed and using a more ductile filler alloy, specimens with microstructures consisting of spherical gamma' precipitate particles and dispersed discreet MC carbides along the grain boundaries, displayed a considerably improved weldability due to a strong reduction of the intergranular HAZ cracking associated with the liquation microfissuring phenomena. (C) 2011 Elsevier Inc. All rights reserved.

引用

页码：1116 / 1123

页数：8

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