一、前言铸造镍基高温合金在焊接时通常容易形成焊接热裂纹——结晶裂纹和液化裂纹,如图1所示。由于焊接热裂纹的存在,使合金性能和使用寿命受到严重影响。国内外许多焊接冶金工作者对此十分重视,并做了大量研究工作。例如,日本的井川博等提出晶间白色相是Inconel 713C 等镍基合金形成焊接热裂纹的主 First, the preface Casting nickel-base superalloy welding is usually easy to form a hot weld cracking - crystal cracks and liquefied cracks, as shown in Figure 1. Due to the existence of welding hot cracks, the performance and service life of the alloy are seriously affected. Many domestic and foreign welding metallurgy workers attach great importance to this and do a lot of research work. For example, Japan’s Ichikawa Bo proposed intergranular white phase is Inconel 713C and other nickel-based alloys to form the main hot welding cracks