连续退火工艺参数对1 180 MPa级含Nb增强成形性双相钢组织性能的影响

doi:10.13228/j.boyuan.issn1006-9356.20230489

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Abstract In order to achieve the goal of energy conservation and emission reduction, automobile bodies are developing towards lightweight and high-quality direction. DH steel has a wide application prospect due to its excellent strength and plasticity performance. The high formability 1 180 MPa grade Nb-microalloyed dual phase steel, exhibiting excellent properties, had been developed through laboratory simulated continuous annealing and characterization analysis of microstructure and properties. The results of continuous annealing tests reveal that the increase of annealing temperature lead to corresponding rise in the content of martensite and bainite, consequently resulting in enhancement of tensile strength up to 1 200 MPa at 870 ℃. As the annealing temperature further increases, the volume fraction of tempered martensite and the bainite increases, resulting in slight decrease in strength. As the over-aging temperature increases, the tensile strength gradually decreases and the elongation increases to 16.2% at 370 ℃. Based on the continuous annealing test results and the feature of industrial production line, DH1180 continuous annealing plates was industrially produced. Its microstructure is composed of ferrite, martensite, bainite, and residual austenite(φ(γ)=6.62%), dispersed with nano-scaled (Nb,Ti)C precipitates, showing superior match of strength and plasticity with tensile strength of 1 257 MPa and elongation of 15.6%. The development and application of DH1180 steel provides more possibilities for high-strength steel for automobile.

Key words： continuous annealing retained austenite precipitates microstructure and property dual phase steel with high formability

Received: 25 August 2023

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	Articles by authors
	YANG Yuhuan
	CHU Xiaohong
	LU Hongzhou
	HAN Yun
	YANG Feng
	ZHAO Zhengzhi

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YANG Yuhuan,CHU Xiaohong,LU Hongzhou等. Effect of continuous annealing process parameters on microstructure and properties of 1 180 MPa grade Nb-microalloyed dual phase steel with high formability[J]. China Metallurgy, 2024, 34(1): 72-80.

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http://www.zgyj.ac.cn/EN/10.13228/j.boyuan.issn1006-9356.20230489 OR http://www.zgyj.ac.cn/EN/Y2024/V34/I1/72

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