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Liquid‐phase sintering of TiN‐enriched T15‐grade high‐speed steels and their mechanical properties
Author(s) -
Kar Pradipt Kumar,
Upadhyaya Gopal Shankar
Publication year - 1991
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199101310
Subject(s) - materials science , tin , sintering , metallurgy , powder metallurgy , lubricant , composite material
The present investigation is an attempt to develop composites based on high‐speed steel through liquid‐phase sintering route using a powder metallurgical technique. Water‐atomised annealed T15‐grade HSS powder, lubricant and various mass percents of TiN (0–8%) were blended and axially compacted into green pellets at 850 MPa at room temperature. During sintering studies carried out in vacuum (10 −2 torr), optimum temperature for full densification was determined for each composition. Only full dense sintered samples (density ≥98% theoretical) were selected for further heat treatment and the evaluation of mechanical properties. Mechanical properties like hardness, transverse rupture strength and hot compressive yield strength were evaluated. Both qualitative and quantitative metallographic studies were carried out and chemical analysis of various phases in sintered as well as heat‐treated composites were determined using SEM‐EDX. The results confirm that fully dense composites containing up to 2% TiN exhibit equivalent mechanical properties, although some differences in service behaviour e.g. wear resistance are to be expected.