Test Study On Remanufacturing Of Shaft Parts In35CrMo Steel By Laser Cladding

Shaft parts which widely used are playing an important role in modern society. Due to the high static strength, impact toughness and fatigue limit,35CrMo is the raw material of some shaft parts. In the actual produce, the parts are affected by the work environment; they are easily to produce failure modes wear, deformation, corrosion, etc. Each year, iron and steel scrapped caused by failure waste lots of resources. So, finding a way to repair these slightly damaged and failure shaft parts, which achieve or exceed the performance of repair, have a significant in industrial.Laser cladding technology is an advanced surface modification technology as an important branch of laser remanufacturing technology. It can improve or repair damaged parts through forming a good cladding layer combining with matrix on the damaged parts’ surface by melting and concreting the required cladding powder using the high density of laser beam energy. In this article, the laser cladding technology was used to choose and strengthening the repairing powder of35CrMo steel and optimize the parameters of the laser cladding process. The specific research works are as follows:1) Deciding course of design and experiment in this paper as well as materials and methods of the test.2) Laser cladding the3540iron-based powder and Ni00nickel base powder on35CrMo steel surface respectively, comparing and analyzing the microstructure, micro-hardness, friction and wear properties and corrosion resistance of the test samples, testing the metallurgical bonding strength between the cladding powder and substrate by doing the standard tensile samples. According to the results of test’s data, the average micro-hardness value of3540iron base powder cladding layer was higher and wear resistance and tensile performance was better than Ni00nickel base powder cladding layer, but the latter performed better in corrosion resistance.3) In the preferred choice of iron base powder3540we added mass fraction is5%,10%,15%and10%of WC powder to strengthen the wear resistance properties of cladding layer on the basis of the research analysis in2) aiming at the most common failure forms of35CrMo steel shaft parts and analyzing the influences of different percentage of WC content on properties of cladding layer. The results showed while adding amount is10%WC, the cladding layer had better surface properties, and can obtain higher micro-hardness value and better friction and wear properties.4) The adding cladding powder on the surface of35CrMo steel shaft parts was determined through previous experiments. On this basis of this, the best process parameters of cladding3540+10%WC powder on35CrMo steel shaft parts had been obtained through designing the orthogonal test table and analyzing influences of laser power, scanning speed and defocusing amount on the properties of cladding layer. The optimal parameters P=3kW, V=6mm/s, L=20mm.This article provided reference of the research of repairing35CrMo steel shaft parts and had important practical significance on reducing the waste of resources and environment bearing.