Plasma arc cold hearth melting(PAM)technology represents a notable advancement in titanium metallurgy,as it effectively eliminates high-and low-density inclusions in titanium alloys.This study aims to explore the comp...Plasma arc cold hearth melting(PAM)technology represents a notable advancement in titanium metallurgy,as it effectively eliminates high-and low-density inclusions in titanium alloys.This study aims to explore the compositional homogeneity and longitudinal/transverse macrostructures of∅660 mm titanium alloy ingots produced via single-pass PAM.Further,the compositional uniformity of∅760 mm titanium alloy ingots fabricated through hybrid PAM and vacuum arc remelting(VAR)is examined.Thereafter,the mechanical properties of forged bars from PAM+VAR ingots are experimentally evaluated,revealing that the PAM ingots exhibit shallower melt pools and finer grain structures compared with the VAR ingots,although with inferior compositional uniformity and surface quality relative to triple VAR ingots.Overall,PAM+VAR effectively mitigates composition heterogeneity in single PAM ingots while satisfying forging requirements.展开更多
文摘Plasma arc cold hearth melting(PAM)technology represents a notable advancement in titanium metallurgy,as it effectively eliminates high-and low-density inclusions in titanium alloys.This study aims to explore the compositional homogeneity and longitudinal/transverse macrostructures of∅660 mm titanium alloy ingots produced via single-pass PAM.Further,the compositional uniformity of∅760 mm titanium alloy ingots fabricated through hybrid PAM and vacuum arc remelting(VAR)is examined.Thereafter,the mechanical properties of forged bars from PAM+VAR ingots are experimentally evaluated,revealing that the PAM ingots exhibit shallower melt pools and finer grain structures compared with the VAR ingots,although with inferior compositional uniformity and surface quality relative to triple VAR ingots.Overall,PAM+VAR effectively mitigates composition heterogeneity in single PAM ingots while satisfying forging requirements.
