During welding metallurgic process, re compound with surface energy separated out previously from superheating melted metal, and acted as the crystallizing nucleus of compound carbides.

具有高能表面的稀土化合物质点，在焊接冶金过程中领先析出于过热液相内，充当了包裹式碳化物颗粒的非自发晶核核心。