Hot Cracking Susceptibility of 800H and 825 Nickel-Base Superalloys during Welding via Spot Varestraint Test

• 作者: Chih-Chun Hsieh Ching-Yi Pao Weite Wu
• 来源期刊: 金属材料研究(英文)
• 学科: 工学
• 关键词: Gas TUNGSTEN arc WELDING Hot CRACKING sensitivity Nickel-base SUPERALLOYS Heat-affected zone
• 年，卷（期）: 2019,（1）
• 页码范围: 19-29
• 页数: 11页
• 分类号: TG1

摘要

Hot cracking susceptibility of fillers 52 and 82 in 800H and 825 nickel-base superalloys was discussed using the Spot Varestraint test.The fillers of 52 and 82 were added into nickel-base superalloys via a gas tungsten arc welding(GTAW).Experimental results showed that the hot cracking sensitivity of the nickel-base superalloys with filler at high temperature was lower than that without filler.The hot cracking sensitivity had a slight effect when the filler 82 was added.The total length of crack was increased,the liquid-solid(L-S)two-phase range is higher so that the hot cracking susceptibility will be raised.The morphologies of cracks included the intergranular crack in the molten pool,molten pool of solidification cracking,heat-affected zone of intergranular cracks,and transgranular crack in the heat-affected zone.