Superplastic Solid-Phase Welding of 40 Cr-T10A Steel

摘要

The microstructure of 40Cr and T10A steel sample and its surface to be welded i5 ultra-fined through salt-bath cyclic quenching and high frequency hardening, then the surface is cleaned. Under non-vacuum and no shielded gas. the welding parameter of isothermal superplastic solid- phase welding and the effect of surface microstructure prior to pressure welding on the quality of joint are studied. At the temperature of 730 ～ 750deg.C and at initial strain rate of (2～4) x 10~-4 s~-1, the strength of the joint is up to or close to that of 40Cr base metal in 3～5 min pressure welding.