两相区退火热轧中锰钢碳化物析出行为与组织性能研究

doi:10.11896/cldb.18060114

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Abstract The effect of carbide precipitation behavior at different annealing time on microstructure evolution, retained austenite content and mechanical properties for medium manganese steel was investigated by means of ART (Austenite reversed transformation) annealing heat treatment process. The results indicate that the microstructure of experimental steel is composed of ferrite, retained austenite and a small amount of martensite heterogeneous structure after treated by ART process. In the pre-annealing (5 min), the carbide is inhibited by high-density dislocations pinning C and Mn atoms, so that reversed austenite is precipitated before carbides at the boundaries of prior austenite or martensite laths. In the middle of annealing (10 min), the dislocation density decreases rapidly due to recovery, and the diffusion activation energy of C and Mn atoms are increased, which promotes the precipitation of a large amount of carbides. With the annealing time prolonged (30—60 min), the fine carbides are gradually dissolved as the nascent austenite core, and the volume fraction of retained austenite and C content increase. With the precipitation and dissolution of carbides, the yield strength of experimental steel first increase and then decrease, but the elongation and uniform ductility after fracture show a tendency of continuous increased. After 60 min annealing, the elongation after fracture reaches 41.1%, the uniform ductility reaches 34.3%, and the tensile strength reaches 821 MPa. The experimental steel obtaines the production of strength and elongation of up to 33 743 MPa·%.

Key words： medium-manganese steel carbide precipitation behavior retained austenite precipitation strengthening work hardening rate

Published: 12 July 2019

CLC number:

TG156.2

Fund:This work was financially supported by the National Natural Science Foundation of China (51574107), and Nature Science Foundation of Hebei Pro-vince, China (E2016209048, E2017209048).

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	Articles by authors
	TIAN Yaqiang
	LI Wang
	ZHENG Xiaoping
	SONG Jinying
	WEI Yingli
	CHEN Liansheng

Cite this article:

TIAN Yaqiang,LI Wang,ZHENG Xiaoping, et al. Study on Carbide Precipitation Behavior and Microstructure and Mechanical Property of Intercritically Annealed Hot-rolled Medium Manganese Steel[J]. Materials Reports, 2019, 33(16): 2765-2770.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.18060114 OR http://www.mater-rep.com/EN/Y2019/V33/I16/2765

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