Analysis of Surface-interface of Boronized Layer on Cr12MoV Cold-worked Die Steel

doi:10.3969/j.issn.1000-1093.2015.03.028

Abstract

Abstract: The surface of Cr12MoV cold-worked die steel is boronized by the method of hot-dipping, and the surface and interface morphologies and the chemical and phase compositions are analyzed by SEM, EDS and XRD, respectively. The residual stress and retained austenite on the surface are analyzed, and the hot-dipped boronizing mechanism is discussed. The results show that the tiny pores exist on the surface of boronized layer, and are related to the elements which are not solubled in boride. FeB is formed in the diffusion layer that has a preferred orientation in crystal plane (002), and the chemical reactions and mutual diffusion of elements occur in the layer. The surface residual stress is changed from tensile stress to compressive stress, and the retained austenite is transformed into martensite after boronizing, which improves the friction and wear properties of cold-worked die steel.

Key words: surface and interface of material, Cr12MoV, boronizing treatment, surface-interface, residual stress, retained austenite

CLC Number:

KONG De-jun, XIE Chun-yang. Analysis of Surface-interface of Boronized Layer on Cr12MoV Cold-worked Die Steel[J]. Acta Armamentarii, 2015, 36(3): 571-576.

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