Title: Experimental investigation on grinding surface condition of 9Mn2V under different tempering processes

Authors: Dapeng Dong; Guoqiang Guo; Qinglong An; Ming Chen

Addresses: School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China ' School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China ' School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China ' School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; College of Electromechanical Engineering, Hunan University of Science and Technology, Xiangtan, 411201, China

Abstract: This paper investigated the surface condition of 9Mn2V in conventional surface grinding using SG (seeded gel) abrasive (3SG46JV) under different tempering processes, which included metallographic structure, micro-hardness, specific grinding energy, surface roughness, surface morphology, surface residual stress and grinding cracks. The experimental results indicated that with the completion of tempering, quenched martensite has transformed into tempered martensite, the micro-hardness of 9Mn2V decreased and the specific grinding energy increased. The ground surface quality improved evidently with the increase of tempering times. Meanwhile, the ground surface was in a state of high tensile residual stress after quenching. After the second time of tempering, the residual stress has significantly reduced. Otherwise, the grinding cracks could be avoided after 9Mn2V was tempered.

Keywords: 9Mn2V; cold working die steel; grinding; tempering process; metallographic structure; microhardness; specific grinding energy; surface roughness; surface morphology; surface quality; surface residual stress; grinding cracks; seeded gel abrasive.

DOI: 10.1504/IJAT.2012.052036

International Journal of Abrasive Technology, 2012 Vol.5 No.4, pp.271 - 285

Received: 17 Oct 2012
Accepted: 18 Oct 2012

Published online: 04 Feb 2013 *

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