g-Cu-Zn钎焊TiC金属陶瓷/铸铁挺柱接头的有限元模拟

Stress concentration zones and the maximum value of thermal stress of the TiC cermet/iron joint brazed with Ag-Cu-Zn filler metal during cooling were studied in this paper. The results show: When the temperature is 300 K, the maximum values of shear stress and tensile stress on TiC cermet/iron interface both appear on the tip of Ag-Cu-Zn/iron interface tip, which makes Ag-Cu-Zn/iron interface become weak zone of the interface. Positive tensile stress on iron undersurface relaxes to the inner of iron and negative tensile stress on iron undersurface concentrates on the side of iron as the temperature declining, so cracks easily appear at the site where positive and negative tensile stress cross.