Effect of weld cooling rate on Laves phase formation in Inconel 718 fusion zone

被引：162

作者：

Manikandan, S. G. K. ^{[1
]}

Sivakumar, D. ^{[1
]}

Rao, K. Prasad ^{[2
]}

Kamaraj, M. ^{[2
]}

机构：

[1] Indian Space Res Org, Bangalore, Karnataka, India

[2] Indian Inst Technol Madras, Madras, Tamil Nadu, India

来源：

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY | 2014年 / 214卷 / 02期

关键词：

Inconel; 718; Instantaneous cooling rate; Helium; Laves phase; GTAW; STRESS RUPTURE PROPERTIES; TREE-RING FORMATION; EQUIAXED TRANSITION; DENDRITE SPACINGS; SOLIDIFICATION; SUPERALLOY; MICROSTRUCTURE; COLUMNAR; MICROSEGREGATION; PARAMETERS;

D O I：

10.1016/j.jmatprotec.2013.09.006

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Inconel 718 (2 mm thick) was welded using argon and helium gas shielded tungsten arc welding process with a filler metal. Both constant current and compound current pulse modes were applied and the cooling rates calculated. The dependence of Laves phase formation, dendrite arm spacing and niobium segregation ratios in fusion zone on the nature of shielding gases and current was studied. The maximum instantaneous weld cooling rate was achieved for the combination of Helium shielding gas and compound current pulse mode. This ultimately resulted in reduction of laves phase, segregation of niobium and dendrite arm spacing in the fusion zone. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：358 / 364

页数：7

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