Paper Title:
Effect of Process Variables on Microstructure and Mechanical Properties of Wide-Gap Brazed IN738 Superalloy
  Abstract

This study investigated the microstructure and mechanical properties of a wide-gap region brazed with various process variables. The IN738 and DF 4B alloy powders were used as additive and filler metal powder for the brazing process. The wide-gap brazing process was carried out in a vacuum of 2×10-5 torr. The wide-gap region brazed with 60wt.% IN738 additive powder had a microstructure consisting of IN738 additive and (Cr, W)2B. The fracture strength of the wide-gap region (60 wt.% additive and 40 wt.% filler metal powder) brazed at 1230°C for 30hr was as high as 862MPa (93% of base material strength). It was observed that the brazing temperature was the main process variable affecting the mechanical properties of the wide-gap brazed region. The creep rupture life of the region brazed with 60wt.% additive and 40 wt.% was longer than that of other brazed samples. The Cracks in the wide-gap brazed region initiated at the (Cr, W)2B and propagated through them. It was found that the (Cr, W)2B and the pore in the brazed region are important microstructural factors affecting the mechanical properties of the wide-gap brazed region.

  Info
Periodical
Key Engineering Materials (Volumes 297-300)
Edited by
Young-Jin Kim, Dong-Ho Bae and Yun-Jae Kim
Pages
2876-2882
DOI
10.4028/www.scientific.net/KEM.297-300.2876
Citation
Y. H. Kim, I. H. Kim, C.S. Kim, "Effect of Process Variables on Microstructure and Mechanical Properties of Wide-Gap Brazed IN738 Superalloy ", Key Engineering Materials, Vols. 297-300, pp. 2876-2882, 2005
Online since
November 2005
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Wei Min Wang, Hao Wang, Zheng Yi Fu
109
Authors: Ben Jun Cheng, Xing Zhong Guo, Li Li, Jian Ming Zheng
Abstract:The mechanism of the effect that zircon additive had on the properties of 95-alumina ceramic was studied and compared with that of zirconia...
1013
Authors: Stefan Holzer, Jan Patrick Häntsche, Ulrich Spicher, Bernd Huchler, Alwin Nagel, Rainer Oberacker, Dirk Badenheim, Michael J. Hoffmann
Abstract:Silicon nitride based ceramics have been investigated since more than forty years. Nevertheless, a good understanding of the...
282
Authors: Hua Wei Jiang, Hong Bing Du, Ting Yan Tian, Hong Wu
Abstract:Transparent ALON ceramics with the ultra-fine -ALON spinel powder were prepared by hot-pressing. The powder was prepared by carbothermal...
580
Authors: Rosa Maria da Rocha, Francisco Cristóvão Lourenço de Melo
Abstract:The effect of three different sintering additive systems on densification of boron carbide powder was investigated. The sintering additives...
170