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Influência do bismuto nas propriedades mecânicas do aço rápido AISI M2 sinterizado

2010; UNIVERSIDADE DO VALE DO RIO DOS SINOS; Volume: 5; Issue: 3 Linguagem: Inglês

10.4013/ete.2009.53.12

ISSN

1808-7310

Autores

Adriana Miwa Aso, Fábio Luis Knewitz, Vinicius Abílio Martins, Wilson Rodrigues, Alexandre da Silva Rocha, Lírio Schaeffer,

Tópico(s)

Metal Alloys Wear and Properties

Resumo

The addition of bismuth in an alloy steel AISI M2 produced by powder metallurgy, has been evaluated aiming to improve the machinability and mechanical properties of this material. For this study, were analyzed samples of AISI M2 steel quick with the following levels of bismuth: 0.1%, 0.3%, 0.5% and 1%. The process of shaping the powder was carried out by uniaxial compaction at 600 MPa and sintering in protective atmosphere of 95% N2 + 5% H2. The sintering temperature used was 1130 ° C. The samples showed a proportional increase of porosity with increasing percentage of bismuth. In the test of wear and compression of the sample of 0.3% of bismuth showed lower mechanical strength. Machinability testing of the samples of M2 and M2with 1% of bismuth sintered obtained chips shear (in the form of needle) and chip block (as arcs), respectively. Key words: high speed steel, bismuth, powder metallurgy, machining.

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