The scanty literature data on thermal diffusivity of P/M steels seems contradictory, if the cooling speed on quenching is the evaluation parameter. Due to the basic importance of diffusivity on the response of P/M steels to heat-treating, an experimental survey has been carried out, to collect data on various P/M steels, based on prealloyed, or diffusion-bonded, or admixed powders. The study has also covered the influence of processing parameters, such as compaction pressure and sintering temperature. The flash method has been used to measure the thermal diffusivity of P/M steels. This method directly measures the thermal diffusivity of a sample in slab shape. A plane-parallel sample is inserted in the test apparatus and then a short light pulse, produced by a laser or a flash lamp, heats the front surface of the sample. The heat diffuses through the sample, leading to a temperature rise on the sample rear surface. An infrared detector measures this temperature rise, versus time, and thermal diffusivity is derived from the least square regression on the whole temperature trend, using the analytical solution of heat conduction. The results show that thermal diffusivity increases as density increases. This achievement can be justified by a simple theoretical analysis of the thermal conductivity on thermal diffusivity. The collected data also enable us to ascertain the influence of sintered material composition and carbon content on thermal diffusivity. The results should contribute to clarify some uncertainties and perplexities on the behavior of properly elaborated P/M steels, to be hardened by heat treatment, conventional - such as oil quenching - or innovative, such as sinter hardening.

Bocchini, G.f., Bovesecchi, G., Coppa, P., Corasaniti, S., Montanari, R., Varone, A. (2014). Experimental investigation on thermal diffusivity of PM steels. In Advances in Powder Metallurgy and Particulate Materials - 2014, Proceedings of the 2014 World Congress on Powder Metallurgy and Particulate Materials, PM 2014 (pp.101-1012). Metal Powder Industries Federation.

Experimental investigation on thermal diffusivity of PM steels

Bovesecchi G.;Coppa P.;Corasaniti S.;Montanari R.;Varone A.
2014-01-01

Abstract

The scanty literature data on thermal diffusivity of P/M steels seems contradictory, if the cooling speed on quenching is the evaluation parameter. Due to the basic importance of diffusivity on the response of P/M steels to heat-treating, an experimental survey has been carried out, to collect data on various P/M steels, based on prealloyed, or diffusion-bonded, or admixed powders. The study has also covered the influence of processing parameters, such as compaction pressure and sintering temperature. The flash method has been used to measure the thermal diffusivity of P/M steels. This method directly measures the thermal diffusivity of a sample in slab shape. A plane-parallel sample is inserted in the test apparatus and then a short light pulse, produced by a laser or a flash lamp, heats the front surface of the sample. The heat diffuses through the sample, leading to a temperature rise on the sample rear surface. An infrared detector measures this temperature rise, versus time, and thermal diffusivity is derived from the least square regression on the whole temperature trend, using the analytical solution of heat conduction. The results show that thermal diffusivity increases as density increases. This achievement can be justified by a simple theoretical analysis of the thermal conductivity on thermal diffusivity. The collected data also enable us to ascertain the influence of sintered material composition and carbon content on thermal diffusivity. The results should contribute to clarify some uncertainties and perplexities on the behavior of properly elaborated P/M steels, to be hardened by heat treatment, conventional - such as oil quenching - or innovative, such as sinter hardening.
2014 World Congress on Powder Metallurgy and Particulate Materials, PM 2014
usa
2014
Rilevanza internazionale
2014
Settore ING-IND/21 - METALLURGIA
Settore ING-IND/10 - FISICA TECNICA INDUSTRIALE
English
Density; Physical properties; Sintered steels
Intervento a convegno
Bocchini, G.f., Bovesecchi, G., Coppa, P., Corasaniti, S., Montanari, R., Varone, A. (2014). Experimental investigation on thermal diffusivity of PM steels. In Advances in Powder Metallurgy and Particulate Materials - 2014, Proceedings of the 2014 World Congress on Powder Metallurgy and Particulate Materials, PM 2014 (pp.101-1012). Metal Powder Industries Federation.
Bocchini, Gf; Bovesecchi, G; Coppa, P; Corasaniti, S; Montanari, R; Varone, A
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/233624
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