The Effects of Simulated Welds on HY-130 Cast and Wrought Plate and Weld Metal Microstructure

摘要

The microstructure and hardness of simulated welds in HY-130 cast plate, wrought plate and weld filler metal are investigated. The dependence of these quantities on the austenitizing temperature and the tempering provided by subsequent weld passes is also investigated. The use of a tempering parameter, as developed by Hollom and Jaffe, allows comparison of different tempering times and temperatures. It was found that in the rapid heating cycle of simulated welding that the AC1 and AC3 temperatures are approximately as much as 150 to 170 F higher than the corresponding temperatures of the equilibrium phase diagram for this 0.1% C-5.0% Ni steel. Results indicate that case plate tends to resist tempering more than either the rolled plate or weld metal. Additionally, structures formed at lower austenitizing temperatures temper more readily. Although all three conditions tempered, the cast plate retained a steep hardness and microstructural gradient through the HAZ and consequently is probably more susceptible to a metallurgical notch effect. (Author)