核岛用P280GH碳锰钢热老化的组织和性能

doi:10.13228/j.boyuan.issn0449-749x.20170089

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Abstract P280GH carbon manganese steels used for the nuclear steam system and auxiliary system pipes in pressurized water reactor nuclear power plant are susceptible to thermal aging brittleness during long-term service at its working temperature from 280 to 350 ℃. In order to investigate its thermal aging behavior， P280GH carbon manganese steels have been thermally aged at 400 ℃ for up to 10 000 h. The micro-hardness of ferrite and pearlite phases， conventional tensile properties and impact properties at different aging duration have been measured. The results show that the micro-hardness of ferrite and pearlite gradually decreases with increasing thermal aging time. The tensile strength and yield strength increase within 300 h and then progressively and slightly decrease after 300 h with the long aging time， respectively. The charpy impact energy slightly decreases with the long aging time. The changes of all the above mechanical properties of P280GH carbon manganese steels are associated with the changes of the pearlite morphologies， dislocation configurations in ferrite and precipitates after different thermal aging time.

Received: 23 February 2017 Published: 07 September 2017

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	Articles by authors
	YU Hui
	DI Jian-Wei
	ZHANG Tiao-Fan
	LIU Shuai-Shuai
	LIU Li-Gang

Cite this article:

YU Hui,DI Jian-Wei,ZHANG Tiao-Fan等. Microstructures and properties of nuclear carbon manganese steels P280GH after accelerated aging[J]. Iron and Steel, 2017, 52(9): 66-72.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20170089 OR http://www.chinamet.cn/Jweb_gt/EN/Y2017/V52/I9/66

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