The As-Quenched Microstructure and Tempering Behaviour of Rapidly Solidified Tungsten Steels.
SUSSEX UNIV BRIGHTON (ENGLAND) SCHOOL OF ENGINEERING AND APPLIED SCIENCES
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Transmission electron microscopy and microhardness testing were used to examine the as-quenched structure and mechanical properties of a series of iron-tungsten-carbon alloys ranging from 6 to 23 tungsten with a constant WC atomic ratio of 21 and T1 tool steel. The iron-tungsten-carbon alloys were found to exhibit a significant change in microstructure and hardness as the tungsten and carbon content were increased. The change in morphology was from lath martensite in the lower tungsten alloys to a solidification structure of delta-ferrite cells surrounded by austenite and M6C carbide, in the higher tungsten alloys. An increase in the hardness from 700 kgsq mm to 1050 kgsq. mm accompanied this change in morphology. A model is proposed to explain the morphological change, in addition, the tempering behaviours of rapidly solidified Fe-6.3 wtW-O.21wtC, Fe-23wtW-0.75wtC and T1 tool steel were examined and compared to those observed for the conventional solution-treated and quenched alloys. Author
- Properties of Metals and Alloys