Effects of tungsten addition and heat treatment conditions on microstructure and mechanical properties of microalloyed forging steels

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:562

Article

Zhao, Jingwei^1,2  Jiang, Zhengyi²  Lee, Chong Soo^1,3 

[1] Pohang Univ Sci & Technol, Dept Mat Sci & Engn, Pohang 790784, South Korea

[2] Univ Wollongong, Sch Mech Mat & Mechatron Engn, Wollongong, NSW 2522, Australia

[3] Pohang Univ Sci & Technol, Grad Inst Ferrous Technol, Pohang 790784, South Korea

关键词: Microalloyed forging steel;    Tungsten;    Heat treatment;    Toughness;    Tensile properties;   

DOI  :  10.1016/j.msea.2012.11.006

来源: Elsevier

【 摘 要 】

In the present work, the effects of tungsten (W) addition and heat treatment conditions on the microstructure, impact toughness and tensile properties of microalloyed forging steels were studied. Four kinds of microalloyed forging steels were produced by varying W additions (0, 0.5, 1 and 2 wt%). Heat treatment was carried out at temperatures ranging from 840 to 950 degrees C followed by air and furnace cooling. Mechanical tests were used to evaluate the room temperature Charpy impact and tensile properties. The resulting microstructures were analysed via optical microscope (OM), scanning electron microscope (SEM) and transmission electron microscope (TEM). The results show that the microstructure and mechanical properties of the microalloyed forging steels are closely related to the W content Correct selection of heat treatment temperature and cooling method is very important to enhance the mechanical properties. The optimum heat treatment temperatures obtained in this study are 920, 900, 880 and 860 degrees C for the steels with 0%, 0.5%, 1% and 2% W, respectively. Both the impact toughness and tensile properties of the microalloyed forging steels have been significantly enhanced after heat treatment at the optimum temperatures followed by air cooling. (C) 2012 Elsevier B.V. All rights reserved.

【 授权许可】

Free