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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Microstructure and Mechanical Behavior of Induction-Assisted Laser Welded AHS Steels

Author(s):
Lima, M. S. F. [1] ; Gonzales, D. [2] ; Liu, S. [2]
Total Authors: 3
Affiliation:
[1] Inst Adv Studies, Sao Paulo - Brazil
[2] Colorado Sch Mines, Golden, CO 80401 - USA
Total Affiliations: 2
Document type: Journal article
Source: WELDING JOURNAL; v. 96, n. 10, p. 376S-388S, OCT 2017.
Web of Science Citations: 1
Abstract

The present study proposes an innovative method of laser welding at high temperatures, where the rapid solidification and preheating were performed consecutively in the same setup. The 22MnB5 hot pressed, advanced high-strength steel (AHSS) parts were heated to a given temperature and held for a given time to ensure an isothermal condition, after which, laser welding was performed. The welded part was then maintained at a high temperature for a sufficient time to develop a bainitic structure. A steel part was welded both in ambient and high-temperature conditions. The welds made using the same laser parameters, an induction heating to 445 degrees or 529 degrees C, and isothermal treatment of 10 min produced a bainite plus retained austenite microstructure. The hardness was greatly reduced when using the high-temperature welding method, and the hardness profiles were flat compared to the room temperature welded sample. The tensile behavior of the room temperature welded coupons presents high tensile strength (1200 MPa) and negligible maximum elongation (1.3%). Alternatively, the high-temperature coupons present tensile strengths of 840 and 650 MPa and total elongation of 2.7 and 3.5%, for the conditions 445 degrees and 529 degrees C, respectively. Therefore, the high temperature coupons demonstrated higher toughness compared to the room temperature coupons. (AU)

FAPESP's process: 14/26930-7 - Laser beam welding of advanced high strength steels in the bainitic range for aerospace applications
Grantee:Milton Sergio Fernandes de Lima
Support Opportunities: Scholarships abroad - Research