Composition Of High-speed Steel Research Articles

Effects of sintering temperature on interface microstructure and element diffusion of WC-Co-Ni-Fe/high-speed steel composites

In this study, the layered composites of the micro bit with WC-Co-Ni-Fe as outer material and high-speed steel (HSS) as inner material were prepared by self-designed mold in the laboratory. The effects of sintering temperature on microstructure, interfacial element diffusion and microhardness of WC-Co-Ni-Fe/HSS composites were studied. The results show that with the increase of sintering temperature, the number of micropores in WC-Co-Ni-Fe/HSS composites decreases, the mutual diffusion trend of Co, Ni, Cr and Mo at band area increases, and W element has no obvious diffusion in band area. When the sintering temperature is 1250 °C, a reaction layer with a certain width begins to form at the interface between the WC-Co-Ni-Fe and high-speed steel, and the two materials are metallurgical bonded. When the sintering temperature was 1310℃, micropores were observed at the interface.

Optimisation of chemical composition of high speed steel with high vanadium content for abrasive wear using an artificial neural network

The wear weight loss were measured by pin-disk abrasive wear machine after high speed steels with V = 5–10% and C = 1.66–3.3% were quenched at 1050 °C, and tempered at 550 °C. By the use of back propagation (BP) network, the non-linear relationship between the wear weight losses ( W) and carbon contents, vanadium contents ( C, V) has been established on the base of dealing with the experimental data. The results show that the well-trained BP neural network can predict the wear weight loss precisely according to carbon contents and vanadium contents. The prediction results show the optimal V and C contents for abrasive wear are 9–10% and 3–3.4%, respectively. And the prediction values have sufficiently mined the basic domain knowledge of relationship between abrasive wear property and chemical composition of alloys. Therefore, a new way of optimising chemical composition for wear of materials has been provided by the authors.

A New Low Alloy High Speed Power Hack Saw Blades

Plasma surface alloying for low alloy high speed power hack saw blades was introduced.The bulk material of the blade is made of low alloy steel, while the teeth of which possess a composition of high speed steel like as a result of surface modification by a plasma surface alloying process.It is a solid diffusion process eliminating method avoids the formation of coarse primary carbides which is a major problem encountered in the production of smelting high speed steel. As a result the carbides in the layer of high speed steel are fine and well-distributed.Therefore,it has not only well wear-resistance but also toughness. Besides, the blade also has the advantages of ease manufacturing and low cost.

TiCN—high speed steel composites: sinterability and properties

Metal matrix composites, based on M3/2 high speed steel and reinforced with two different percentages of TiCN (2.5 and 5 wt%), were manufactured following a conventional powder metallurgy route: mixing, compacting and sintering. The carbide and base material powders were dry mixed and uniaxially compacted at 700 MPa. After this, vacuum sintering was carried out at different temperatures to study the sinterability of manufactured composites. Effects of sintering temperature on sintering density, dimensional change and hardness with temperature were measured, and this study was completed with a dilatometric analysis. Materials were sintered at optimum sintering temperature (1275 °C), and transverse rupture strength and wear behaviour of sintered materials was examined.

Heat Treatment Response of Sintered M3/2 High Speed Steel Composites Containing Additions of Manganese Sulphide, Niobium Carbide, and Titanium Carbide

Abstract Metal matrix composites based on a sintered M3/2 high speed steel (HSS) and containing either single additions of TiC, NbC, or MnS particles or combined additions of MnS + TiC or MnS + NbC were sintered to full density and subjected to a conventional hardening heat treatment cycle of austenitisation, quenching, and double tempering. Relatively poor hardnesses and strengths were obtained in any composites that contained MnS particles, principally because of the weakening effects of MnS particles in the structure but also as a result of decarburisation of the steel matrix when oxygen introduced by the MnS particles reacted with carbon. Composites that contained TiC were changed in structure so that matrix M6C carbides were replaced by the less soluble MC carbide. They consequently showed slightly reduced hardening response compared to the baseline M3/2 HSS after heat treatment. Ball milling was necessary in powder mixtures that contained NbC to break up particle agglomerates. The resultant fine gra...

High speed steel composites with additions of titanium carbide and nitride : M.M. Oliviera, J.D. Bolton (University of Bradford, Bradford, UK)

High speed steel composites with additions of titanium carbide and nitride : M.M. Oliviera, J.D. Bolton (University of Bradford, Bradford, UK)

Electronic mechanism of sintering: Some case studies on real systems

The paper reviews the role of electronic configuration model of condensed state in explaining the sintering behaviour of various alloys. The systems are copper base alloys, ferrous alloys containing phosphorus, tungsten based heavy alloys, Al-refractory carbide composites, 6061 Al-alloy composites, high speed steel composites and tungsten carbide based cemented carbides. These studies cover the research activities of the Powder Metallurgy Laboratory at IIT, Kanpur.