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Editor： Date：2014-08-06 16:21:52 Views：7663
1: by adding Ni, Mo, Mn alloying elements and proper austenitizing temperature quenching to obtain good performance of the martensite / bainite dual phase grey cast iron.
2: when quenching around graphite undercooled austenite priority into lower bainite, and the internal micro stresses in the transformation of Shi Mojian lower bainite more fully.
3：reasons: due to the segregation of Mn, Mo elements, quenching early formation of a large number of stable residual austenite "white area" in the eutectic cell boundary, the hardness can reach 800HV, 250 ℃ for long time tempering can make its part into a high carbon martensite, but can not be completely eliminated.
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