| Full text | |
| Author(s): |
Braga, Vagner
[1]
;
de Figueiredo Mansur, Raquel Alvim
[1]
;
Mota de Siqueira, Rafael Humberto
[1]
;
Fernandes de Lima, Milton Sergio
[1]
Total Authors: 4
|
| Affiliation: | [1] Inst Estudos Avancados IEAv, Sao Jose Dos Campos, SP - Brazil
Total Affiliations: 1
|
| Document type: | Journal article |
| Source: | Soldagem & Inspeção; v. 23, n. 3, p. 402-412, JUL-SEP 2018. |
| Web of Science Citations: | 0 |
| Abstract | |
Abstract Laser welded Transformation-induced plasticity (TRIP) steels are known to generate martensite in the fusion (FZ) and the heat-affected (HAZ) zones. To solve this issue, the present study proposes a high temperature (HT) welding to avoid decay below the martensite start temperature after laser welding. Therefore, an inductive heating has been used to reach 500 °C before laser weld of superposed 1.6mm thick TRIP steel class 750. After welding the temperature was kept constant at 500 °C for more 10 minutes in order to austemper. The microstructures of the welds at high temperature are composed of bainite and residual austenite with an FZ hardness up to 300 HV, compared to 450 HV of the ambient temperature (AT) weld. The HT values of hardness are slightly higher than a traditional post-weld heat treatment (TW), 300 HV compared to 250 HV, because of the tempering kinetics in each case. Erichsen cup indentation tests shown the HT coupons presents better formability compared to the AT or TW conditions. The present contribution highlights a possible solution to the intrinsic brittleness during cold forming of laser welded TRIP 750 steel by applying an inductive in-situ austempering. (AU) | |
| FAPESP's process: | 16/16683-8 - Experimental development of high temperature laser welding for ultra-high strength steels for aerospace applications |
| Grantee: | Milton Sergio Fernandes de Lima |
| Support Opportunities: | Regular Research Grants |