Evolution of Microstructure and Mechanical Properties of a Stainless-Steel Powder/Wire Mesh Composite Porous Strip for Powder Densification

摘要

A device that automatically feeds powder and wire mesh was developed to produce a stainless-steel powder/wire mesh composite porous strip (PWMCS). The PWMCS was cut into three same-sized samples, whereby one sample comprised the original strip with no further processing, one sample was rolled for 15 passes, and the last sample was rolled twice for 15 passes and re-sintered; thus, the three samples displayed different porosities. X-ray diffraction, optical microscopy, and scanning electron microscopy were used to investigate the microstructure and phase transformation of the samples. Tensile experiments were also conducted. The results revealed that with the added rolling deformation, more gamma-austenite changed to alpha '-martensite, and both the yield and ultimate tensile strengths increased markedly (361.4 +/- 10.5% and 189.5 +/- 14.7% increases, respectively). All three samples exhibited ductile fracture, and the dimples varied from large and deep in the initial state to shallow appearance in the final state.

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