Studies on induction hardening of powder-metallurgy-processed Fe-Cr/Mo alloys

Sandeep Chauhan; Vikas Verma; Ujjwal Prakash; P. C. Tewari; Dinesh Khanduja

doi:10.1007/s12613-017-1478-2

Volume 24 Issue 8

Aug. 2017

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2017 > 24(8): 918-925

Sandeep Chauhan, Vikas Verma, Ujjwal Prakash, P. C. Tewari, and Dinesh Khanduja, Studies on induction hardening of powder-metallurgy-processed Fe-Cr/Mo alloys, Int. J. Miner. Metall. Mater., 24(2017), No. 8, pp. 918-925. https://doi.org/10.1007/s12613-017-1478-2

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Sandeep Chauhan, Vikas Verma, Ujjwal Prakash, P. C. Tewari, and Dinesh Khanduja, Studies on induction hardening of powder-metallurgy-processed Fe-Cr/Mo alloys, Int. J. Miner. Metall. Mater., 24(2017), No. 8, pp. 918-925. https://doi.org/10.1007/s12613-017-1478-2

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Research Article

Studies on induction hardening of powder-metallurgy-processed Fe-Cr/Mo alloys

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Corresponding author:
Sandeep Chauhan E-mail: sandeep2140@gmail.com
Received: 28 November 2016; Revised: 1 April 2017; Accepted: 5 April 2017

Abstract

Abstract

Induction hardening of dense Fe-Cr/Mo alloys processed via the powder-metallurgy route was studied. The Fe-3Cr-0.5Mo, Fe-1.5Cr-0.2Mo, and Fe-0.85Mo pre-alloyed powders were mixed with 0.4wt%, 0.6wt%, and 0.8wt% C and compacted at 500, 600, and 700 MPa, respectively. The compacts were sintered at 1473 K for 1 h and then cooled at 6 K/min. Ferrite with pearlite was mostly observed in the sintered alloys with 0.4wt% C, whereas a carbide network was also present in the alloys with 0.8wt% C. Graphite at prior particle boundaries led to deterioration of the mechanical properties of alloys with 0.8wt% C, whereas no significant induction hardening was achieved in alloys with 0.4wt% C. Among the investigated samples, alloys with 0.6wt% C exhibited the highest strength and ductility and were found to be suitable for induction hardening. The hardening was carried out at a frequency of 2.0 kHz for 2-3 s. A case depth of 2.5 mm was achieved while maintaining the bulk (interior) hardness of approximately HV 230. A martensitic structure was observed on the outer periphery of the samples. The hardness varied from HV 600 to HV 375 from the sample surface to the interior of the case hardened region. The best combination of properties and hardening depth was achieved in case of the Fe-1.5Cr-0.2Mo alloy with 0.6wt% C.
- Fe–Cr/Mo alloys;
- powder metallurgy;
- sintered density;
- tensile strength;
- induction hardening;
- case depth

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References

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