Physical Metallurgy of Steel Weldability

摘要

The concept of hardenability used in the welding field differs from that used in the heat treatment. It rep- resents the hardened depth after quenching in the heat treatment while it is related with the welding condi- tion for fully hardened heat-affected-zone (HAZ) in the welding. The effect of steel chemical composition on hardenability is expressed by a multiplying factor for the former and by carbon equivalency for the latter. The metallurgical relation between these two factors can be clarified by a heat conduction analysis of a quenched round bar.