Heat treatment effects on the hardness and wear behavior of laser-welded AISI40 martensitic steel plates

Autor(es)

Martins Barcelos Goncalves, Karina Aparecida ^[1] ; de Faria, Geraldo Lucio ^[1] ; Mota de Siqueira, Rafael Humberto ^[2] ; de Oliveira, Tarcisio Reis ^[3] ; Fernandes de Lima, Milton Sergio ^{[1, 2]}

Afiliação do(s) autor(es)

^[1] Fed Univ Ouro Preto UFOP, Themat Network Mat REDEMAT, Ouro Preto, MG - Brazil

^[2] Inst Adv Studies IEAv, Photon Div, Sao Jose Dos Campos, SP - Brazil

^[3] Aperam South Amer, Timoteo, MG - Brazil

• Tipo de documento: Artigo Científico
• Fonte: INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY; v. 114, n. 3-4, p. 1155-1163, MAY 2021.
• Citações Web of Science: 0

Resumo

The use of laser beams for joining materials has grown along with the need to weld more challenging materials such as martensitic steels. In this work, an AISI 420 martensitic steel plate was autogeneously welded using a fiber laser. The process parameters were 2000 W power and weld speed of 16 mm/s with the focus on the plate surface. Before welding, the plates were prepared in two conditions, tempered, or annealed, and tempering was performed at temperatures of 300 degrees C, 400 degrees C, 500 degrees C, and 700 degrees C after welding. The finite element analysis and dilatometric tests allowed to determine the phase transformations of this steel under development by the company Aperam. The observed microstructure varies according to the initial state of the plate and subsequent heat treatments. The hardness of the fusion and heat-affected zones varied according to the samples. The welded sample in the tempered state softened moderately due to the reheating of the laser beam. In the case of the annealed sample, the hardness of the molten zone was the highest obtained. This high hardness was reflected by a high resistance to wear by reciprocal sliding in the annealed case, compared to the other conditions. The fusion zone generally proved to be much more resistant to wear than the base material. (AU)

• Processo FAPESP: 16/11309-0 - Estudo, desenvolvimento e aplicação de processo híbrido: Manufatura Aditiva (Ma) + High Speed Machining/Grinding (HSM/G)
• Beneficiário: Reginaldo Teixeira Coelho
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 19/25229-7 - Fabricação de estruturas de satélites de pequeno porte com uso de lasers
• Beneficiário: Rafael Humberto Mota de Siqueira
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado