Welding processes for Inconel 718- A brief review

International Conference on Recent Advances in Materials, Mechanical and Civil Engineering

材料科学;机械制造;土木建筑工程

Tharappel, Jose Tom^1 ; Babu, Jalumedi^1

MED, SJCET, Choondacherry

Kerala

686579, India^1

关键词: Alloy chemistry;    Cracking problem;    Cracking susceptibility;    Liquation cracking;    Post weld heat treatment;    Primary and secondary processing;    Solidification cracking;    Welding process;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/330/1/012082/pdf
DOI  :  10.1088/1757-899X/330/1/012082

来源: IOP

【 摘 要 】

Inconel 718 is being extensively used for high-temperature applications, rocket engines, gas turbines, etc. due to its ability to maintain high strength at temperatures range 450-700°C complimented by excellent oxidation and corrosion resistance and its outstanding weldability in either the age hardened or annealed condition. Though alloy 718 is reputed to possess good weldability in the context of their resistance to post weld heat treatment cracking, heat affected zone (HAZ) and weld metal cracking problems persist. This paper presents a brief review on welding processes for Inconel 718 and the weld defects, such as strain cracking during post weld heat treatment, solidification cracking, and liquation cracking. The effect of alloy chemistry, primary and secondary processing on the HAZ cracking susceptibility, influence of post/pre weld heat treatments on precipitation, segregation reactions, and effect of grain size etc. discussed and concluded with future scope for research.