Hot cracking in cast alloy 718
Journal article, 2018

Hot cracking susceptibility of the Fe–Ni-based precipitation hardening cast superalloy Alloy 718 was studied by Varestraint weldability testing. The effect of two hot isostatic pressing (HIP) treatments commonly employed in the aerospace industry was investigated in reference to the as cast condition. It was found that the heat affected zone (HAZ) liquation cracking susceptibility increased for samples with pre-weld HIP treatments. The as cast condition disclosed the best response for liquation cracking followed by HIP-1120 (1120°C/4h (HIP) + 1050°C/1h and furnace cooling to 650°C/1h in vacuum + 950°C/1h) and HIP-1190 (1190°C/4h (HIP) + 870°C/10h and furnace cooling to 650°C/1h in vacuum + 950°C/1h). The amount of the secondary precipitates and base metal grain size was found to be important parameters influencing the cracking susceptibility. Regarding solidification cracking susceptibility, the three conditions appear to behave similarly.

Hot cracking

alloy 718

solidification cracking

Varestraint testing

hot isostatic pressing

liquation cracking

Author

Sukhdeep Singh

Chalmers, Industrial and Materials Science, Materials and manufacture

Joel Håkan Andersson

Chalmers, Industrial and Materials Science, Materials and manufacture

Science and Technology of Welding and Joining

1362-1718 (ISSN) 1743-2936 (eISSN)

Vol. 23 7 568-574

Subject Categories

Manufacturing, Surface and Joining Technology

Metallurgy and Metallic Materials

DOI

10.1080/13621718.2018.1429238

More information

Latest update

8/14/2018