DENSIFICATION AND MICROSTRUCTURE FORMATION OF SYSTEMS BASED ON HSS M2-SiC-Cu AT LOW TEMPERATURE VACUUM SINTERING
Year: 2026
Type: article
Abstract: Highlights of the Study This study investigated the densification and microstructural evolution of M2-grade high-speed steel (HSS) powder compacts containing SiC and Cu additions. Specimens were produced by uniaxial cold compaction followed by vacuum sintering at relatively low temperatures of 1100–1120 °C. The effects of the additives on powder compressibility, sintering kinetics, microstructure, density, and mechanical characteristics were evaluated using optical microscopy, SEM, EDX analysis, and standard density and mechanical measurements. Key findings: 🔹 Low-temperature vacuum sintering: M2 high-speed steel powder compacts were successfully processed through uniaxial cold compaction followed by vacuum sintering at 1100–1120 °C. 🔹 Improved powder compressibility: Addition of ductile Cu powder enhanced the compressibility of the M2 high-speed steel powder during compaction. 🔹 Effect of SiC on consolidation: Incorporation of hard SiC particles had a detrimental effect on powder consolidation during the compaction stage. 🔹 Limited Cu densification effect: During low-temperature vacuum sintering, Cu addition produced only a marginal influence on the densification behavior of the steel specimens. 🔹 Enhanced sintering kinetics: SiC addition considerably increased the sintering kinetics and promoted higher densification of the M2 steel powder compacts. 🔹 Reaction-assisted densification: The enhanced densification was attributed to a reaction between the M2 steel matrix and SiC particles at approximately 1100 °C, resulting in the formation of a low-melting Fe–Si–C phase. 🔹 Microstructural trade-off: Although SiC-containing specimens achieved high densification rates, grain and carbide coarsening were identified as potential consequences of the enhanced sintering process. 🔹 Property optimization potential: By controlling powder composition and sintering conditions, structural characteristics, density, wear resistance, resistance to hot cratering, and hot hardness could potentially be optimized for specific applications. Overall, the study demonstrates that SiC addition can substantially enhance the low-temperature sintering kinetics and densification of M2 high-speed steel through reaction-assisted formation of a low-melting Fe–Si–C phase, while Cu primarily improves powder compressibility, providing complementary strategies for tailoring the processing and performance of powder-metallurgy high-speed steels. KEYWORDS High Speed Steel • M2 Steel • Silicon Carbide (SiC) • Copper • Powder Metallurgy • Compaction • Vacuum Sintering • Densification • Microstructure HOW TO CITE Simchi, A., & Khakbiz, M. (2003). Densification and microstructure formation of M2 high speed steel with SiC and Cu additions. Powder Metallurgy Progress, 3(4), 165–174. Publisher: Powder Metallurgy Progress DOI: Not provided in the supplied source. Article Website: The supplied source identifies the article as published in Powder Metallurgy Progress, Volume 3, Issue 4 (2003), pp. 165–174.
Author: Khakbiz, Mehrdad
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7222945530