| Full text | |
| Author(s): |
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]
Total Authors: 5
|
| Affiliation: | [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
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY; v. 114, n. 3-4, p. 1155-1163, MAY 2021. |
| Web of Science Citations: | 0 |
| Abstract | |
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) | |
| FAPESP's process: | 16/11309-0 - The study, development and application of a hybrid process: Additive Manufacturing (AM) plus High Speed Machining/Grinding (HSM/G) |
| Grantee: | Reginaldo Teixeira Coelho |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 19/25229-7 - The fabrication of small satellites with use of lasers |
| Grantee: | Rafael Humberto Mota de Siqueira |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |