Study on the HAZ Cracking of 75Ni-15Cr-Fe alloy (1st Report)

The characteristics of 75Ni-15Cr-Fe alloy and its HAZ cracking

Abstract

Studies were conducted to investigate the effects of compositions and any other factors on the HAZcracking of 75Ni-15Cr-Fe alloy and to perform the prevention of it.
In the 1th report, the characteristics of the 75Ni-15Cr-Fe alloy and the HAZ cracking of the alloy were described.
The contents described in this report are as follows:
1. Eutectic structure (Ni₂Mg+Ni), which is substituted partially by Cr and Fe in a portion of Ni, crystalizes in 75Ni-15Cr-Fe alloy containing Mg
2. Grain boundary weld cracking is occured in the HAZ of 75Ni-15Cr-Fe alloy
3. HAZ cracking of 75Ni-15Cr-Fe alloy is affected rather by the chemical composition than by welding method, type of welding joint and thickness of plate