Effect of nitrogen on supersolidus sintering of modified M35M high speed steel

Abstract

. The diminution of the optimum sintering temperature and the widening of the Water atomised high vanadium M35M high speed sintering gate were proved. It was also demonstrated steel powders with different carbon contents were cold that sintering to full density of modified high carbon-high compacted at 700 MPa and sintered under an N 2 rich vanadium T42, T15, and M35M HSSs under 1150°C is atmosphere. Full density specimens were obtained at possible.10-12 This marks a historical milestone because temperatures between 1140 and 1105°C for carbon continuous mesh belt furnaces could now be used to contents between 1•8 and 2•5 wt-% respectively. The sinter HSS. sintering behaviour of these powder mixtures was cor-However, the interpretation of how nitrogen affects related with dilatometric curves and phase diagram sinterability was only made in a descriptive way. The aim calculations made by Thermo-Calc software. It is of this paper is to show the correlation between supersolidus demonstrated that densification takes place above the sintering behaviour and the nitrogen effect. The effect of solidus temperature, within the austenite+carbide+ nitrogen has been studied through the sintering behaviour liquid phase field, and that nitrogen widens this of modified M35 HSS. Experimental results have been region, which is responsible for increased sinterability explained under the basis of the supersolidus theory and with regards to vacuum sintered high speed steel.the phase diagrams obtained by Thermo-Calc software PM/0836 and the SSOL databank. Calculations of phase diagrams where the effect of sintering atmosphere can be taken into The authors are at CEIT and Faculty of Engineering, account would be a powerful tool for designing powder

Comprehensive Investigations of the Supersolidus Liquid-Phase Sintering of Two Plastic Mold Steels

“…In recent years, several articles have been published on the liquid-phase sintering of prealloyed tool steels by means of so-called supersolidus liquid-phase sintering (SLPS). [3][4][5][6][7] Compared to PM-HIP, which requires encapsulation of the powder, the benefits of sintering by SLPS are reduced costs, a greater flexibility with respect to the geometry, and the possibility of producing near-net-shape parts.…”

Sintering in different atmospheres of T15 and M2 high speed steels produced by a modified metal injection moulding process

“…As reported in [5,[9][10][11], nitrogen is beneficial to sintering, not only because it can provide sufficient protection against oxidation, but it can also permeate into the matrix of the material and transform the MC carbides found in vacuum sintering into metallic carbonitrides (MX) which are more stable and are able to inhibit grain growth. Nitrogen may also be related to the expansion of the critical liquid +austenite+carbides region as mentioned by Aguirre et al [12].…”

“…The application of the PIM process to HSS has been developed in recent years [11][12][13][14][15][16][17][18] and for the production of components of complex shape it is considered better than other manufacturing techniques, such as pressure die compaction, which are limited to the manufacture of parts with simple shapes.…”

Effect of residual carbon on the sintering process of M2 high speed steel parts obtained by a modified metal injection molding process

“…Several authors [18][19][20][21][22][23] include hardness, wear resistance, strength, ductility, and have observed that besides adjusting the composition, this dimensional precision. In addition, a high final sintered denaddition enhances the sintering kinetics and leads to higher sity is important because most properties improve with it.…”