Strengthening and Application Research of Carburized and Subsequently Niobiumized 40CrNiMo Steel

Jun Liu; Hao Yang

doi:10.4028/www.scientific.net/AMR.1015.185

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Strengthening and Application Research of Carburized and Subsequently Niobiumized 40CrNiMo Steel
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Strengthening and Application Research of Carburized and Subsequently Niobiumized 40CrNiMo Steel

Abstract:

The strengthening treatment of carburized and subsequently niobiumized 40CrNiMo steel used for cutting pick has been discussed, and the microstructure and composition of niobiumizing layer are investigated by metallographic microscope, SEM and EDS, and XRD, which are compared with conventional strengthening treatment specimens in lab and working situation respectively. The results indicate that the main phases are NbC and Nb6C5 in the niobiumized layer, and the loss of weight of carburized and subsequently niobiumizing strengthening specimens is 58.4% of conventional strengthening ones ,and the working service life of cutting pick is increased by 69.0% ~ 78.1%.