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

Abstract

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} Prime precipitates (357-442 nm), with blocky MC and discreet M{sub 23}C{sub 6} carbides dispersed within the coarse dendrites and in the interdendritic regions; and 2) ordered {gamma} Prime 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} Prime 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. - Highlights: Black-Right-Pointing-Pointer Homogeneous microstructures of {gamma} Prime spheroids and discreet MC carbides of Ni base superalloys through preweld heat treatments. Black-Right-Pointing-Pointer {gamma} Prime spheroids and discreet MC carbides reduce the intergranular HAZ liquation and microfissuring of Nickel base superalloys. Black-Right-Pointing-Pointer Microstructure {gamma} Prime spheroids and discreet blocky type MC carbides, capable to relax the stress generated during weld cooling.more » Black-Right-Pointing-Pointer Low welding heat input welding speeds and ductile filler alloys reduce the HAZ cracking susceptibility.« less

Authors:
 [1];  [2];  [3]
  1. Facultad de Ingenieria Mecanica y Electrica (FIME-UANL), Av. Universidad s/n. Ciudad Universitaria, C.P.66451 San Nicolas de los Garza, N.L. (Mexico)
  2. FRISA Aerospace, S.A. de C.V., Valentin G. Rivero No. 200, Col. Los Trevino, C.P. 66150, Santa Caterina N.L. (Mexico)
  3. Corporacion Mexicana de Investigacion en Materiales S.A. de C.V. (COMIMSA), Ciencia y Tecnologia No.790, Saltillo 400, C.P. 25295 Saltillo Coah. (Mexico)
Publication Date:
OSTI Identifier:
22066395
Resource Type:
Journal Article
Journal Name:
Materials Characterization
Additional Journal Information:
Journal Volume: 62; Journal Issue: 12; Other Information: Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1044-5803
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CARBIDES; DENDRITES; FILLERS; GRAIN BOUNDARIES; HEAT AFFECTED ZONE; HEAT RESISTING ALLOYS; HEAT TREATMENTS; INCONEL ALLOYS; PARTICLES; PRECIPITATION; SCANNING ELECTRON MICROSCOPY; STRESSES; TUNGSTEN; WELDABILITY; WELDED JOINTS; WELDING

Citation Formats

Gonzalez, M.A., E-mail: mgonzalez@comimsa.com.mx, Martinez, D.I., E-mail: dorairma@yahoo.com, Perez, A, Guajardo, H, and Garza, A. Microstructural response to heat affected zone cracking of prewelding heat-treated Inconel 939 superalloy. United States: N. p., 2011. Web. doi:10.1016/J.MATCHAR.2011.09.006.
Gonzalez, M.A., E-mail: mgonzalez@comimsa.com.mx, Martinez, D.I., E-mail: dorairma@yahoo.com, Perez, A, Guajardo, H, & Garza, A. Microstructural response to heat affected zone cracking of prewelding heat-treated Inconel 939 superalloy. United States. https://doi.org/10.1016/J.MATCHAR.2011.09.006
Gonzalez, M.A., E-mail: mgonzalez@comimsa.com.mx, Martinez, D.I., E-mail: dorairma@yahoo.com, Perez, A, Guajardo, H, and Garza, A. 2011. "Microstructural response to heat affected zone cracking of prewelding heat-treated Inconel 939 superalloy". United States. https://doi.org/10.1016/J.MATCHAR.2011.09.006.
@article{osti_22066395,
title = {Microstructural response to heat affected zone cracking of prewelding heat-treated Inconel 939 superalloy},
author = {Gonzalez, M.A., E-mail: mgonzalez@comimsa.com.mx and Martinez, D.I., E-mail: dorairma@yahoo.com and Perez, A and Guajardo, H and Garza, A},
abstractNote = {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} Prime precipitates (357-442 nm), with blocky MC and discreet M{sub 23}C{sub 6} carbides dispersed within the coarse dendrites and in the interdendritic regions; and 2) ordered {gamma} Prime 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} Prime 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. - Highlights: Black-Right-Pointing-Pointer Homogeneous microstructures of {gamma} Prime spheroids and discreet MC carbides of Ni base superalloys through preweld heat treatments. Black-Right-Pointing-Pointer {gamma} Prime spheroids and discreet MC carbides reduce the intergranular HAZ liquation and microfissuring of Nickel base superalloys. Black-Right-Pointing-Pointer Microstructure {gamma} Prime spheroids and discreet blocky type MC carbides, capable to relax the stress generated during weld cooling. Black-Right-Pointing-Pointer Low welding heat input welding speeds and ductile filler alloys reduce the HAZ cracking susceptibility.},
doi = {10.1016/J.MATCHAR.2011.09.006},
url = {https://www.osti.gov/biblio/22066395}, journal = {Materials Characterization},
issn = {1044-5803},
number = 12,
volume = 62,
place = {United States},
year = {Thu Dec 15 00:00:00 EST 2011},
month = {Thu Dec 15 00:00:00 EST 2011}
}