回火温度对改进型T23钢冲击吸收功的影响

doi:10.13228/j.boyuan.issn0449-749x.20200381

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Abstract The safety of ultra-super critical power plants is severely endangered by the high reheat-cracking susceptibility of T23. Our former experimental results showed that the reheat cracking susceptibility of modified T23 steel was highly improved by modifying the composition,but the impact absorbed energy decreased. In order to improve the impact absorbed energy of modified T23 steel, the effect of tempering temperature on the microstructure,hardness and impact absorbed energy of modified T23 steel was investigated in this paper. The hardness and impact absorbed energy of modified T23 steel after tempering at 750-810 ℃ were measured,and the microstructure was analyzed by optical microscope (OM),scanning electron microscope (SEM) and transmission electron microscope (TEM). The result shows that with increasing tempering temperature,the hardness of modified T23 steel decreases,while the impact absorbed energy increases firstly and then decreases. After tempering at 790 ℃,the impact absorbed energy reaches the maximum value. The main reasons for the decrease of hardness are the softening of matrix,the decomposition of M-A constitutes and the widening of bainitic laths. Compared with tempering at 750 ℃,the number of M-A constitutes with large size in modified T23 steel after tempering at 790 ℃ decreases,and the size is smaller. There are still some M₂₃C₆ carbides with small size at the grain boundaries, and the degree of bainitic lath widening is low. The crack propagation is hindered effectively,hence the impact absorbed energy is the highest. When the tempering temperature is increased to 810 ℃,the number of small M-A constitutes decreases and a large number of M₂₃C₆ carbides dissolve. In particular,the retarding effect of crack propagation is further reduced due to the severe widening of bainitic laths. Therefore,the impact absorbed energy decreases.

Key words： modified T23 steel tempering temperature microstructure hardness impact absorbed energy

Received: 27 July 2020

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	Articles by authors
	ZHOU Ren-yuan
	ZHU Li-hui
	KE Zhi-gang
	LI Shi-xian
	ZHAI Guo-li
	SONG Ming

Cite this article:

ZHOU Ren-yuan,ZHU Li-hui,KE Zhi-gang等. Effect of tempering temperature on impact absorbed energy of modified T23 steel[J]. Iron and Steel, 2021, 56(3): 51-57.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20200381 OR http://www.chinamet.cn/Jweb_gt/EN/Y2021/V56/I3/51

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