Home FOR AUTHORS Kovove Materialy-Metallic Materials 2020 Kovove Materialy-Metallic Materials Vol. 58 (2020), no. 2, pp.121–128

Journal info

Select Journal







Webshop Cart

Your Cart is currently empty.
Info: Your browser does not accept cookies. To put products into your cart and purchase them you need to enable cookies.

Kovove Materialy-Metallic Materials Vol. 58 (2020), no. 2, pp.121–128

Title: Microstructure evolution and properties of reheated coarse grain heat-affected zone of 900 MPa grade HSLA steel
Author: H. Qin, Z. Qiao, Q. Wu, J. Lian, L. Wang, Y. Cui
Abstract: The welding thermal simulation technology was used to simulate secondary thermal cycle of coarse grain heat-affected zone (CGHAZ) of BWELDY960Q steel, and the change of microstructure and toughness in CGHAZ after reheating was studied in detail. The results show that when the peak temperature of the secondary thermal cycle is 1200 and 1000 °C, the microstructure of reheated coarse grain heat-affected zone (RCGHAZ) is martensite; when the peak temperature is 800 °C, the microstructure of RCGHAZ constitutes of martensite, upper bainite and M-A constituent. The toughness of CGHAZ is improved undergoing secondary thermal cycle, but it is still lower than that of base metal. Compared with the mechanical properties of CGHAZ, the hardness values of inter-critical and sub-critical RCGHAZ are decreased, while the toughness of super-critical and sub-critical RCGHAZ is increased. Impact fracture exhibits evident plastic deformation, the edge of fracture has tearing edges and corners, and microscopic morphology presents the characteristics of dimp fracture.
Keywords: HSLA steel, reheated coarse grain heat-affected zone, microstructure, properties
Published online: 02-Apr-2020
Year: 2020, Volume: 58, Issue: 2 Page From: 121, Page To: 128
doi:10.4149/km_2020_2_121


download file


© AEPress s.r.o
Copyright notice: For any permission to reproduce, archive or otherwise use the documents in the ELiS, please contact AEP.