Effect of grinding parameter on grinding-hardened case and  its uniformity of nodular cast iron QT400

doi:10.13251/j.issn.0254-6051.2022.03.037

Abstract

Abstract: Grinding-hardening was done on nodular cast iron QT400 by using two-passes grinding up-grinding+down-grinding on a surface grinder. The influence of depth of cut a_p and table speed v_w on grinding-hardened case and its uniformity was studied.The results show that there are three case of the hardened surface of the specimen, which are melted layer, completely hardened case and incompletely hardened case. Among them, the structure of the melted layer is secondary cementte, retained austenite and carbides. The microstructure of the complete transformation hardened case is acicular martensite, retained austenite and spheroidal graphite, and the structure of the incompletely hardened case is acicular martensite, ferrite, retained austenite and spheroidal graphite.The average value of the high hardness region in the microhardness distribution curve is between 850-950 HV0.2. Compared with the matrix (190-230 HV0.2), the microhardness is increased by nearly 3 times. With the increase of grinding depth a_p or the decrease of feed speed v_w, the surface layer of the specimen shows the changing order of "completely unhardened→incompletely hardened→completely hardened→melted", the range of the high hardness region in the microhardness distribution curve also becomes wider, the depth of the grinding-hardened case is also increased and the uniformity is better.

Key words: grinding parameter, grind-hardening, nodular cast iron QT400, hardened case, uniformity

CLC Number:

TG156

Zhao Xiaofeng, Liu Judong, Huang Songwei. Effect of grinding parameter on grinding-hardened case and its uniformity of nodular cast iron QT400[J]. Heat Treatment of Metals, 2022, 47(3): 198-203.

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Effect of grinding parameter on grinding-hardened case and its uniformity of nodular cast iron QT400

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