退火温度对冷轧中锰钢组织性能和断裂行为的影响

doi:10.13228/j.boyuan.issn0449749x.20190073

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Abstract To systematically study the effects of intercritically annealing and austenite reverted transformation annealing on the properties of mediumMn steel and provide the theoretical basis for its practical application，effects of annealing temperature in a range of 650-900 ℃ on microstructures，mechanical properties and fracture behavior were studied for a coldrolled mediumMn steel. The results show that the comprehensive mechanical properties of specimen after intercritical annealing were obviously superior to the specimen by austenite reverted transformation annealing. When annealed at 650-750 ℃，the tensile strength of about 1 000 MPa and product of strength and ductility of above 30 GPa·% were obtained. The fracture exhibits distinct layerlike cracks and massive dimples. When the annealing temperatures were 800-900 ℃，the tensile strength fluctuates greatly in the range of 743-1 154 MPa while the products of strength and ductility were below 10 GPa·%. Meanwhile，the brittle intergranular fracture occurred due to the poor elongation and the fracture surfaces were flat. Annealed at 650 ℃，the microstructures consist of equiaxed/lamellar ferrite and austenite，as well as abundant cementite. With increasing temperature，the cementite gradually dissolved and disappeared，and the volume percent of austenite and equiaxed grains increased. When the annealing temperature was 750 ℃，52.2% austenite was obtained. Martensite was generated at 800 ℃. With further increasing annealing temperature，austenite volume percent decreased，and only 14.6% austenite was retained at 900 ℃.

Key words： coldrolled mediumMn steel； annealing； microstructure； mechanical property； fracture morphology

Received: 26 February 2019 Published: 15 November 2019

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	Articles by authors
	YANG Lifang1
	WEI Huanjun2
	SUN Li1
	XIN Ruishan1
	MA Cheng1
	PAN Jin1

Cite this article:

YANG Lifang1,WEI Huanjun2,SUN Li1等. Effect of annealing temperatures on microstructures，mechanical #br# properties and fracture behavior of a coldrolled mediumMn steel[J]. Iron and Steel, 2019, 54(11): 80-87.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449749x.20190073 OR http://www.chinamet.cn/Jweb_gt/EN/Y2019/V54/I11/80

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