Microstructures and Properties of HAZ of JB800 Bainite Steel

Abstract:

JB800 steel has grain boundary allotriomorphic ferrite and granular bainite (F_GBA/B_G), and it is a kind of high strength low alloy steels, which has simple produce procedure, lower cost and excelled property. The law of microstructure transformation in CGHAZ, hardness, and impact toughness in HAZ of JB800 steel were studied by means of thermal simulation. The test results show that under the general condition of welding process (t_8/5=5~50s), microstructure of CGHAZ is composed of mixture microstructure of Martensite and Bainite and with the increase of cooling rate, the content of Martensite will decrease, but that of Bainite will increase; when t_8/5 is 20s, CGHAZ zone have better impact toughness, which is composed of 95% Martensite and 5% Bainite. Therefore t_8/5 should be controlled at about 20s to get better impact toughness.

• Periodical: Applied Mechanics and Materials (Volumes 670-671)
• Pages: 65-69
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.670-671.65
• Online since: October 2014
• Authors: Jun Sheng Sun*, Hong Quan Wang
• Keywords: Bainite Steel, Microstructure, Toughness, Welding Thermal Simulation

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