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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Microstructure and wear behaviour of laser hardened SAE 4130 steels

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Author(s):
Bambirra de Oliveira, Raphael Jose [1] ; Mota de Siqueira, Rafael Humberto [2] ; Fernandes de Lima, Milton Sergio [2]
Total Authors: 3
Affiliation:
[1] Fed Univ Ouro Preto UFOP, REDEMAT, Sch Mines, BR-35400000 Ouro Preto, MG - Brazil
[2] Inst Adv Studies IEAv, Photon Div, BR-12228970 Sao Jose Dos Campos, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: International Journal of Surface Science and Engineering; v. 12, n. 2, p. 161-170, 2018.
Web of Science Citations: 1
Abstract

Low alloy SAE 4130 steel had been laser hardened for the microstructure, hardness and wear characterisation. An almost fully martensitic layer, with case depth of approximately 0.5 mm, was obtained by defocusing a fibre laser by 50 mm. The best results were produced by 600 W laser powers, a beam defocusing of 50 mm and a speed of 8 or 10 mm/s, where a maximum hardness of 390 HV was obtained compared to 220 HV of the base material. The laser treated surfaces presented a combination of oxides and wear behaviour distinctly superior to the bare surface. The coefficients of friction (COF) of the lasered surfaces were approximately half of the bare condition. The average COF maximum value and standard deviation was superior for the bare compared to the lasered conditions. Finally, the wear rate is three times larger in the unlasered sample compared to the laser treated ones. (AU)

FAPESP's process: 07/08265-2 - Characterization of laser treated surfaces by X-ray diffraction
Grantee:Milton Sergio Fernandes de Lima
Support Opportunities: Regular Research Grants