Effect of silicon, vanadium and nickel on microstructure of liquid phase sintered M3/2 grade high speed steel

Abstract

Liquid phase sintering of M3/2 grade high speed steel (HSS) was carried out at 1270uC in high vacuum reaching near full density starting from loose packed powder. Focus is placed on the study of the effects of the addition of Si, Ni and V as elemental powder and cooling rates on the as sintered microstructure, the main objective being improving M 6 C characteristics and control of pearlite appearance. Slow cooling from the sintering temperature and Si addition in wt-% resulted in a completely fine pearlitic matrix with less elongated and more uniformly distributed M 6 C precipitates. Adding V or Ni in wt-% quantities decreased the amount of pearlite owing to MC formation and delayed pearlite formation. The study involved the use of thermodynamic modelling and sintering cycle optimisation as well as the evaluation of sintered material by means of optical and scanning electron microscopy, X-ray diffraction and hardness testing.PM/1115

Effect of Rare Earth Elements on Microstructure and Hot Workability of AISI T15 High Speed Steel

“…[1][2][3] For this type of steel, there contains numerous alloying elements, mainly W, Mo, Cr, V, Co, etc. [4][5][6][7] Such excellent performance of high-speed steel is largely attributed to the dissolution of alloying elements and the precipitation of carbides. Especially, the sizes, distribution, morphology and content of carbides in the matrix have a critical impact on the comprehensive properties of materials.…”

Microstructures and Properties of T1 High‐Speed Steel Modified by In Situ Fe–Cr–Ti–C–N Nanocomposite Inoculants

“…[ 7,8 ] Recent studies have reported that Ti, Nb, V, Ni, Zr, and other strong carbon compound elements added to HSS melt allowed for the formation of a higher melting‐point carbide, thereby refining the matrix structure. [ 9–11 ]…”

Tungsten Carbide as an Addition to High Speed Steel Based Composites

“…In recent years, work has been undertaken to sinter metal matrix composites that contain ceramic particles in HSSs by the same route. Most studies have focused on sintering with additions of hard ceramics such as Al203, VC, NbC, TiC, WC and TiN with the aim of producing a more wear resistant HSS type material [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. These composite materials have been developed for wear resistance applications as attractive alternative to the more expensive cemented carbides.…”