LIU Caiyun, LIU Shiwei, SUN Yuan, et al. Research progress of weldability of superalloys by fusion welding. [J]. 51(1):28-36(2021)
DOI:
LIU Caiyun, LIU Shiwei, SUN Yuan, et al. Research progress of weldability of superalloys by fusion welding. [J]. 51(1):28-36(2021) DOI: 10.7512/j.issn.1001-2303.2021.01.04.
Research progress of weldability of superalloys by fusion welding
The research status of fusion welding of nickelbased superalloys and cobalt-based superalloys are reviewed.The mechanism of welding cracking and the effects of welding process and alloy compositions on weldability are described here. The weldability of nickel-based superalloys can be improved by adjusting alloy compositions,changing the morphology of precipitations and grain boundaries,and choosing reasonable welding process parameters. Compared with the precipitationstrengthened nickel-based superalloys,the solid-solution strengthening cobalt-based alloys have good weldability and exhibit superior welding fusion interface and high cracks resistance. In recent years,researchers have found that the lattice mismatch of γ and γ’ is positive in precipitation-strengthened cobalt-based superalloys,which would effectively reduce the sensitivity of welding strain aging cracks. The novel precipitation-strengthened cobalt-based superalloys have excellent mechanical properties and weldability,which are likely to become one of the most promising high-temperature materials.
Harbin Welding Institute Limited Company, China Academy of Machinery Science and Technology
State Key Laboratory of Advanced Brazing Filler Metals & Technology, Zhengzzhou Research Institute of Mechanical Engineering Co. Ltd.
CRRC Tangshan Co., Ltd., Manufacture Process Technology Center
Ukrainc Institute of Welding,Guangdong Academy of Sciences, China-ukraine Belt and Road Joint Laboratory of Material Connection and Advanced Manufacturing
State Key Laboratory of Advanced Brazing Materials and Technology,Zhenzhou Research Institute of Mechanical Engineering Co.,Ltd.