EFFECT OF PRE-POST TIG WELDING HEAT TREATMENT ON CAST NI SUPERALLOY
Loading...
Date
2020
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Université de M'sila
Abstract
The effect of a preheating (before) and post (after) welding heat treatment on the
microstructure and mechanical properties of the scrap blades made of cast
INC738LC superalloy is the main goal of the present investigation. The filler used in
TIG welding was INC 625 solution hardened superalloyas proposed solution for hot
cracking of the cast INC738LC superalloyin literature. The TIG welding was
processed with respect to the constant optimized parameters (current, voltage,
speed, gas flux rate and number of passes) to make a mechanical properties
comparison between as received and the welded superalloy with heat
treatedspecimens. The characterization techniques employed in this study are
hardness measurements, tensile tests, optical microscopy and scanning electron
microscopy. We found that the proposed preheating improves the TIG welding of the
INC 738 LC superalloy specimens and the post welding heat treatment as expected
enhances its mechanical properties.
Description
Keywords
Ni-basesuperalloy; Microstructure; Heat treatment; Welding; Precipitation