Wear characteristics of austenitic steel and martensitic steel at high temperature

Abstract

The wear under high-temperature condition is one of the die failure patterns. Therefore, the wear resistance at high temperature is an important parameter for selecting die materials. In this work, the wear resistance of SDHA steel and 4Cr5Mo2V steel at 400 - 700°C were evaluated by a friction and wear tester. The wear behaviors and oxide types were investigated through a scanning electron microscope (SEM) and X-ray diffraction (XRD). The results show that the oxides on the worn surface are Fe2O3 and Fe3O4 at the test temperatures. The wear volume of two steels first decreases and then increases, reached the minimum value at 500 ℃. Besides, SDHA steel has better wear resistance compared with 4Cr5Mo2V steel, which is attributed to the excellent hardness stability at high temperature. The coarse M7C3 carbides in 4Cr5Mo2V steel cause the peeling and delamination of oxide layer to damage wear resistance at 700 ℃.

Recent advances in mitigating fusion zone softening during laser welding of Al-Si coated 22MnB5 press-hardened steels

“…As Al gets tied up in the AlN particles, it is removed from solid-solution in the bulk matrix, minimizing its ferrite stabilizing effect, which can be one of the additional reasons for the increase in PAG size that was observed in the Ni-alloyed sample. The presence of the AlN particles may also be credited with the refinement of the hierarchical martensitic structures observed in the sample, similar to what has been seen elsewhere [45,84].…”