Numerical simulation of TiC cermet/iron joint brazed with Ag-Cu-Zn filler metal
(1.黑龙江省哈尔滨市哈尔滨工业大学现代焊接生产技术国家重点实验室2.Department of Mathematics, Harbin Institute of Technology, Harbin 150001, China3.State Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin 150001, China)
Abstract: Stress concentration zones and the maximum value of thermal stress of TiC cermet/iron joint brazed with Ag-Cu-Zn filler metal during cooling were studied. The results show that when the temperature is 300K, 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, which makes Ag-Cu-Zn/iron interface become weak zone of the interface. Tensile stress on iron undersurface relaxes to the inner of iron, and the compression stress on iron undersurface concentrates on the side of iron as the temperature decreases, so cracks appear easily at the site where tensile and compression stress cross.
Key words: numerical simulation； TiC cermet； iron； brazing； tappet