A special additive manufacturing (AM), called as Direct Metal Laser Sintering (DMLS), is a technology that produces 3D workpieces using wide range of different metals raw materials. The aim current research to investigate the plasma nitriding effect on DMLS produced samples. direct treatment was achieved at 440 °C for 4 hours with 75%N2 – 25%H2 gas mixture. Before treatment, 316L austenitic sta...

Abstract A typical nitrogen expanded austenite layer is formed by plasma-based low-energy ion implantation (PBLEII) on AISI 304L austenitic stainless steel at a moderate temperature of 380 °C. The dislocation self-organization structure in the characterized as an evolution from partial and Lomer-Cottrell dislocations inner near interface to multilayer stacking faults outer nitrided layer. self-...

In order to explore the effect of addition rare earth (RE) a steel microstructure and consequent performance nitrided layer, plasma nitriding was carried out on 38CrMoAl in an atmosphere NH3 at 550 °C for 4, 8, 12 h. The modified layers were characterized using optical microscope (OM), microhardness tester, X-ray diffraction (XRD), scanning electron (SEM), transmission (TEM), electrochemical wo...

Corrosion is one of the major problems in the industry especially on machinery since it weakens the structure of the machinery part and causes the mechanical failure. This will stop the production and increase the maintenance cost. In this study, the corrosion behaviour of gas nitriding on a screw press machine shaft made from AISI 4140 steel was investigated. Pitting corrosion was identified a...

A new alloy for drive-train applications with a significant addition of vanadium is presented. The influence to air-hardening forging steels investigated and discussed. For the investigations, laboratory melt casted forged into rod. mechanical properties microstructure are described compared vanadium-free reference from previous study. component shows high strength hardness in as-forged state (...

In order to improve the low hardness and poor wear resistance of TA2, this paper proposes a composite process cold-rolling low-temperature plasma nitriding with recrystallization. This modification can effectively achieve dual goals modifying matrix structure surface TA2 alloy simultaneously. The experimental results indicate that when deformation rate increases, small-sized grains in sample in...