Effect of TIG Welding on Microstructure and Mechanical Properties of Inconel 718

被引：3

作者：

Ishii, Katsuyoshi ^{[1
]}

Kakehi, Koji ^{[1
]}

Yonemoto, Tomohiro ^{[2
]}

机构：

[1] Tokyo Metropolitan Univ, Grad Sch Sci & Engn, Dept Mech Engn, Tokyo 1920397, Japan

[2] Met Technol Co Ltd, Tokyo 1648721, Japan

来源：

JOURNAL OF THE JAPAN INSTITUTE OF METALS | 2012年 / 76卷 / 05期

关键词：

Inconel; 718; tungsten inert gas welding; solution treatment; delta phase; laves phase;

D O I：

10.2320/jinstmet.76.289

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The effect of welding on microstructure and mechanical properties of Inconel 718 was investigated. In this study, the specimens welded by TIG (Tungsten Inert Gas) welding were subjected to two kinds of post weld heat treatment (PWHT): 954 degrees C solution treatment + aging and 1045 degrees C solution treatment + aging. In both the solution treatments, two kinds of intermetallic compounds were observed in the interdendritic region of the weld metal, where delta-phase (Ni3Nb) and Laves-phase ( (Ni,Cr,Fe)(2) (Nb,Ti,Al)) were precipitated. The relationship between mechanical properties and microstructures was examined. The tensile strength, elongation and creep rupture time of the weld specimen treated at 954 degrees C were decreased by TIG welding due to the coalescence of voids formed around Laves particles in the weld metal. Compared with the base metal, the hardness was decreased in the weld metal while it increased in HAZ (Heat Affected Zone). The solution treatment at 1045 degrees C resulted in dissolution of much more detrimental phases than the solution treatment at 954 degrees C. As a result, the ductility and creep strength of weld specimen treated at 1045 degrees C were better than those of specimen treated at 954 degrees C.

引用

页码：289 / 294

页数：6

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