Microstructure and Mechanical Properties of X80 Induction Heating Bends

Abstract:

By using physical thermal simulation technology, combined with metallographic analysis, tensile tests, impact and hardness tests, effects of heating temperature and cooling speed on microstructure and mechanical properties of X80 induction heating bends were investigated. The results show that as the heating temperature rises, TS of X80 induction heating bends increases gradually. However, when the heating temperature rises above 1100°C, plasticity and toughness of the bends begin to decrease, and grain growth tends to be obvious. When the heating temperature is 1050°C, X80 induction heating bends have a good strength and toughness. As the cooling rate increases, strength and toughness of X80 bends are improved considerably. In the cooling rate range between 20°C/s and 30°C/s, the microstructure of X80 bends is mainly composed of polygonal ferrite and granular bainite. Due to the very high dislocation density inside granular bainite and the fine and dispersed M-A constituents, X80 induction heating bends have a very good strength and toughness.

• Periodical: Materials Science Forum (Volume 762)
• Pages: 158-164
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.762.158
• Online since: July 2013
• Authors: Liu Qing Yang, Yu Liu, Bin Feng, Yu Ran Fan, Deng Zun Yao
• Keywords: Induction Heating Bends, Microstructure, Property, X80 Pipeline Steel

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