EFFECT OF TRANSITION METAL Ni ON WELDING PROPERTIES OF TITANIUM ALLOY STAINLESS STEEL
(1.Second Department; Jiamusi Institute of Technology; Jiamusi 154007 ;
2.School of Materials Science and Engineering; Harbin Institute of Technology; Harbin 150001)
2.School of Materials Science and Engineering; Harbin Institute of Technology; Harbin 150001)
Abstract: With increase of Ti alloys use in industry, weld of Ti alloys to steel becomes more and more impotant. Microstructures and properties of diffusion welded joint of TC 4 to 1Cr18Ni9Ti adding the transition metal Ni have been observed with microscopy, SEM, EPMA and tested by tensile tests, respectively. The results show that atom diffusion and migration between Ti and Fe or C are effectively prevented by adding pure Ni as transition metal and a film joint is obtained. The properties of welded joint depend on weld rate of Ti to stainless steel and the thickness of Ni Ti metallic compounds. The optimum weld parameters are as follows: weld temperature is 850 ℃, weld time is 5 min, weld specific stress is 10 MPa.
Key words: Ti alloy stainless steel transition metal Ni diffusion welding