Effect of Ageing at 700 �� on Microstructure and Mechanical Properties of S31042 Heat Resistant Steel
WANG Jing-zhong1,2,LIU Zheng-dong2,BAO Han-sheng2, CHENG Shi-chang2,WANG Bin2
1. School of Metallurgy and Engineering, Xi��an University of Architecture and Technology, Xi��an 710055,Shaanxi, China 2. Institute for Structural Materials, China Iron and Steel Research Institute Group,Beijing 100081, China
Effect of Ageing at 700 �� on Microstructure and Mechanical Properties of S31042 Heat Resistant Steel
WANG Jing-zhong1,2,LIU Zheng-dong2,BAO Han-sheng2, CHENG Shi-chang2,WANG Bin2
1. School of Metallurgy and Engineering, Xi��an University of Architecture and Technology, Xi��an 710055,Shaanxi, China 2. Institute for Structural Materials, China Iron and Steel Research Institute Group,Beijing 100081, China
ժҪ To investigate the effect of high temperature ageing on the microstructure and mechanical properties of S31042 steel, solid solution treatment at 700 �� was carried out for various time from 10 to 6000 h. Experimental results showed that the change of mechanical properties is closely related to the amount of precipitated phases. During ageing from 10 to 300 h, precipitation in the tested steel increases rapidly, and correspondingly, the high temperature yield strength and room temperature hardness of tested steel increase rapidly. Meanwhile, the thickness of the secondary phase on grain boundaries widens sharply and the room temperature Charpy impact absorb energy decreases. Ageing beyond 300 h, the precipitation in the steel increases gradually and the precipitates coarsen to a certain extent. The high temperature yield strength of the steel keeps stable, and the room temperature Charpy impact energy and hardness decrease slowly. Ageing beyond 3000 h, the mechanical properties of the steel tend to be stable. The main precipitates are M23C6, NbCrN and NbC in the tested steel.
Abstract��To investigate the effect of high temperature ageing on the microstructure and mechanical properties of S31042 steel, solid solution treatment at 700 �� was carried out for various time from 10 to 6000 h. Experimental results showed that the change of mechanical properties is closely related to the amount of precipitated phases. During ageing from 10 to 300 h, precipitation in the tested steel increases rapidly, and correspondingly, the high temperature yield strength and room temperature hardness of tested steel increase rapidly. Meanwhile, the thickness of the secondary phase on grain boundaries widens sharply and the room temperature Charpy impact absorb energy decreases. Ageing beyond 300 h, the precipitation in the steel increases gradually and the precipitates coarsen to a certain extent. The high temperature yield strength of the steel keeps stable, and the room temperature Charpy impact energy and hardness decrease slowly. Ageing beyond 3000 h, the mechanical properties of the steel tend to be stable. The main precipitates are M23C6, NbCrN and NbC in the tested steel.
�ո�����: 2011-09-27
��������: 2013-04-18
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E-mail: wzjxjd2003@sina.com
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WANG Jing-zhong,,LIU Zheng-dong,BAO Han-sheng, CHENG Shi-chang,WANG Bin. Effect of Ageing at 700 �� on Microstructure and Mechanical Properties of S31042 Heat Resistant Steel[J]. �й������ڿ���, 2013, 20(4): 54-58.
WANG Jing-zhong,,LIU Zheng-dong,BAO Han-sheng, CHENG Shi-chang,WANG Bin. Effect of Ageing at 700 �� on Microstructure and Mechanical Properties of S31042 Heat Resistant Steel. Chinese Journal of Iron and Steel, 2013, 20(4): 54-58.
2013, Vol. 20 
