Laser cladding remanufacturing technology of 12CrNi3A steel camshaft

doi:10.13251/j.issn.0254-6051.2021.02.037

Abstract

Abstract: A high hardness laser clad layer was obtained on the worn surface of 12CrNi3A steel camshaft cam for fuel injection pump by using a 2 kW fiber laser. The surface integrality, hardness, microstructure and properties of the clad layer were characterized by PT flaw detection, Vickers hardness tester, metallographic microscope and friction wear tester. The results show that the clad layer has a thickness of about 1 mm and microhardness of about 650 HV, compact microstructure and fine grains, and metallurgical bonding with the 12CrNi3A steel. The wear resistance of the clad layer is better than that of the cam base material, and the repair quality of the camshaft is good to meet the use requirements. It is concluded that the laser cladding technology can be used to repair the severe damaged camshaft surface of the fuel injection pump, and to overcome the distortion problem of the whole axis easily caused by the conventional repair method.

Key words: camshaft, laser cladding, fiber laser, remanufacturing

CLC Number:

TK428

He Jianqun, Wu Chengwu, Wang Jingwen, Wang Wentao, Liu Zhiwei, Han Jingwei, Yin Ziqiang, Cheng Wei. Laser cladding remanufacturing technology of 12CrNi3A steel camshaft[J]. Heat Treatment of Metals, 2021, 46(2): 200-203.

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