Open AccessEffect of Heat Treatment and Plasma Arc Welding on the Mechanical and Metallurgical Properties of Hastelloy C276
Author(s) -
U. Mohammed Iqbal,
S. Muralidharan
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/912/3/032002
Subject(s) - materials science , ultimate tensile strength , metallurgy , welding , elongation , alloy , gas tungsten arc welding , molybdenum , composite material , arc welding
Hastelloy is a superalloy which contains nickel, chromium, iron and molybdenum as its major constituents which possess outstanding high temperature strength and oxidation resistance. The objective of this work is to study the heat treatment effect on mechanical and metallurgical properties of Hastelloy C276. A total of four samples are prepared at two different temperatures (700°C and 900°C) and at two different soaking times (4 and 8 hours). Tensile strength, percentage elongation and hardness were measured for the heat-treated samples. Further plasma arc welding was carried out on the heat-treated samples to understand its effect on tensile strength and hardness. The results indicate that there is significant increase in tensile strength and hardness of the hastelloy after heat treatment. Sample processed at 900°C and 8 hours soaking time has the maximum tensile strength and hardness of 378 MPA and 197 HV respectively. There is slight increase in tensile strength of the plasma arc welded samples. The percentage elongation of heat-treated samples is reduced after the welding process. The XRD pattern of the alloy revealed that the alloy is amorphous or microcrystalline in structure. The SEM image reveals the surface topography of the aged samples which confirms the experimental results.