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      Powder metallurgy of high speed-steel produced by solid state sintering and heat treatment

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          Abstract

          High-speed steel is successfully fabricated by solid state sintering of Fe, Co, WC, Mo 2C, Cr 3C 2 and VC powders under vacuum. The sintering density, microstructure, phase structure, hardness, and transverse rupture strength of the specimens are examined. Results show that the density increases with increasing sintering temperature. Nearly full density is obtained without microstructural coarsening in the sintering temperature range of 1190–1210°C. The optimum sintering temperature for the steel is 1200°C. The suitable quenching temperatures range from 1200 to 1240°C. After heat treatments, the microstructure consists of a martensitic matrix (grain size ≈5 μm) with a homogeneous distribution of MC and M 6C carbides (average size lower than 1 μm). The highest hardness of 68.5 ± 0.3 HRC and the maximum transverse rupture strength of 3.58 ± 0.12 GPa is obtained for the specimen tempered at 560°C.

          Author and article information

          Journal
          ijmr
          International Journal of Materials Research
          Carl Hanser Verlag
          1862-5282
          2195-8556
          11 August 2015
          : 106
          : 8
          : 870-876
          Affiliations
          a School of Materials Science and Engineering, Xiangtan University, Hunan, PR China
          b Key Laboratory of Materials Design and Preparation Technology of Hunan Province, Xiangtan University, Xiangtan, PR China
          c Key Laboratory of Low Dimensional Materials & Application Technology of Ministry of Education, Xiangtan University, Hunan, PR China
          Author notes
          [* ] Correspondence address, Prof. Zhi Li, Professor of School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, Hunan Province, P.R. China, Tel.: +86(0)73158292213, Fax: +86(0)73158292213, E-mail: zhili_xtu@ 123456outlook.com
          Article
          MK111239
          10.3139/146.111239
          1b6e299f-2498-4a85-98d1-bcb251c72c9a
          © 2015, Carl Hanser Verlag, München
          History
          : 5 December 2014
          : 10 February 2015
          : 21 April 2015
          Page count
          References: 20, Pages: 7
          Categories
          Original Contributions

          Materials technology,Materials characterization,Materials science
          Powder metallurgy,Heat treatment,Solid phase sintering,High-speed steels,Transverse rupture strength

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