Sinter Hardening PM Steels Prepared through Hybrid Alloying

Machinability of Sinter-hardening PM materials with experimental machining enhancers

Although powder metallurgy is an economical method for production of near net shape components, machining operations are often required to deliver desired geometrical features, dimensional tolerances, and surface finish of PM parts. Machining enhancers are used to improve the machinability of PM components and to increase tool life. MnS is the most common machinability enhancer used for PM stee...

Secondary Hardening in High Speed Steels

Duplex Hardening of Steels for Aeroengine Bearings

Duplex hardening is a process in which conventional heat-treatments such as secondary or case hardening are followed up by surface nitriding to achieve exceptional properties, particularly in the context of aeroengine bearings. Hardness values in excess of 1 000 HV can in principle be achieved, and although the hardness decreases as a function of depth below the surface, some level of enhanceme...

Effect of Rare Earth Elements on the Sorption Characteristics of Nanostructured Zr-base Sinter Porous Getter Prepared by Mechanical Alloying

The effect of rare earth (RE) elements, including Ce and La, on the sorption properties of Zr-Co getters was investigated in this work. The phase evolution, microstructural characteristics of getter powders were studied by means of X-ray diffraction method, scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). The nanostructured Zr3Co intermetallic compound has been...

Stablization of Nanotwinned Microstructures in Stainless Steels Through Alloying and Microstructural Design

In this STIR we proposed to investigate the microstructure and alloy composition on the formation and stability of nanotwinned microstructures. The long-term alloy design strategy focuses on microalloying additions to 1) reduce the stacking fault energy (SFE), enhance twinning formation, and increase twin volume fraction; 2) reduce the twin size via increasing interstitial content while also ta...