ISSN 2594-5327
65º Congresso ABM — vol. 65, num.65 (2010)
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High speed steels are usually employed in cutting tools and forming dies. Heat treatment is a primordial step during tools manufacturing process, being responsible for most of final properties, principally hardness and toughness. In this context, a especial interest relies on the effect of hardening variables on mechanical properties and tools performance. Therefore, the present paper aimed to study the effect of cooling rate during the quenching process of AISI M2 high speed steel, under typical industrial conditions. The experiments were carried out in an industrial vacuum furnace, with high pressure nitrogen quenching. Several cooling rates were obtained by modifications of nitrogen pressure and by the use of test specimens with different dimensions. Toughness results were mainly evaluated through static bend test. Low cooling rates were shown to decrease material toughness and large parts presented a decrease in mechanical properties from surface to core regions. Carbide precipitation on grain boundaries are pointed as the main explanation for all these effects.
High speed steels are usually employed in cutting tools and forming dies. Heat treatment is a primordial step during tools manufacturing process, being responsible for most of final properties, principally hardness and toughness. In this context, a especial interest relies on the effect of hardening variables on mechanical properties and tools performance. Therefore, the present paper aimed to study the effect of cooling rate during the quenching process of AISI M2 high speed steel, under typical industrial conditions. The experiments were carried out in an industrial vacuum furnace, with high pressure nitrogen quenching. Several cooling rates were obtained by modifications of nitrogen pressure and by the use of test specimens with different dimensions. Toughness results were mainly evaluated through static bend test. Low cooling rates were shown to decrease material toughness and large parts presented a decrease in mechanical properties from surface to core regions. Carbide precipitation on grain boundaries are pointed as the main explanation for all these effects.
Palavras-chave
AISI M2; High speed steels; Cooling rate; Toughness; Bending test.
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Como citar
Gonçalves, Cristiane Sales;
Slaviero, André Luiz;
Mesquita, Rafael Agnelli;
Tschiptschin, André Paulo;
Haddad, Paulo de Tarso.
EFFECT OF COOLING RATE DURING QUENCHING ON THE TOUGHNESS OF HIGH SPEED STEELS
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p. 4925-4934.
In: 65º Congresso ABM,
Rio de Janeiro,
2010.
ISSN: 2594-5327
, DOI 10.5151/2594-5327-17093
