Influence of the bismuth on mechanical properties of high speed steel AISI M2 sintered

Adriana Miwa Aso, Fábio Luis Knewitz, Vinícius Martins, Wilson Corrêa Rodrigues, Alexandre da Silva Rocha, Lirio Schaeffer


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.


ISSN: 1808-7310 - Best viewed in Mozilla Firefox

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