Q&P钢在冷却过程中铁素体的相变规律

doi:10.13228/j.boyuan.issn0449-749x.20190522

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Abstract In order to study the ferrite transformation of Q&P (quenching and partition steel) during cooling,the ferrite phase transformation thermal expansion data of different cooling rates of Q&P steel with chemical composition 0.2%C,1.25%Si,2.0%Mn was measured on the thermal dilatometer. The soaking hot treatment process was 846 ℃ soaking for 200 s. The thermal expansion data were treated as the relationship between the phase volume fraction and temperature by lever law. The ferrite phase volume fraction and ferrite grain size were measured by optical microscope. Based on the mixed model,the phase boundary migration rate of ferrite was obtained. Combined with the starting temperature of transformation,the end temperature of transformation was calculated by the mixed model. The evolution process of ferrite grain size in the process of transformation was discussed. The calculated value of ferrite grain size was in good agreement with the measured value. The error between the calculated value and the measured value of the end temperature of transformation was within ±15 ℃. The obtained ferrite transformation law can be used to control the ferrite volume fraction in the cooling process of Q&P steel.

Key words： Q&P steel cooling ferrite phase transformation mixed model saturated position nucleate

Received: 02 December 2019

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	Articles by authors
	HE Fang
	WANG Rui-zhen
	YANG Cai-fu
	JIA Ya-fei
	WU Yan-xin
	LI Mian

Cite this article:

HE Fang,WANG Rui-zhen,YANG Cai-fu等. Ferrite transformation law of Q&P steel during cooling process[J]. Iron and Steel, 2020, 55(9): 81-85.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20190522 OR http://www.chinamet.cn/Jweb_gt/EN/Y2020/V55/I9/81

[1] 邵成伟,王俊涛,赵晓丽,等. 两相区退火处理含铝中锰钢的组织和力学性能[J]. 钢铁,2020,55(5):57.(SHAO Cheng-wei,WANG Jun-tao,ZHAO Xiao-li,et al. Microstructure and mechanical properties of intercritically annealed Al-contain medium Mn steel[J]. Iron and Steel,2020,55(5):57.)
[2] Li W,Gao H,Nakashima H,et al. Microstructural evolution and mechanical properties of a low-carbon quenching and partitioning steel after partial and full austenitization[J]. International Journal of Minerals,Metallurgy,and Materials,2016,23(8):906.
[3] 肖学文,许秀飞. QP钢汽车板热处理工艺与设备探讨[J]. 轧钢,2020,37(2):1.(XIAO Xue-wen,XU Xiu-fei. Discussion on heat treatment technology and furnace for QP steel[J]. Steel Rolling,2020,37(2):1.)
[4] 蒋爱娟,祝贞凤,高千林,等淬火制度对Q&P钢微观组织和力学性能的影响[J]. 钢铁,2019,54(10):80. (JIANG Ai-juan,ZHU Zhen-feng,GAO Qian-lin,et al. Influence of quenching process on microstructure and mechanical properties of Q&P steel[J]. Iron and Steel,2019,54(10):80.)
[5] 李光瀛,王利,马鸣图,等. 第3代先进高强度钢AHSS汽车板的开发[J]. 轧钢,2019,36(5):1.(LI Guang-ying,WANG Li,MA Ming-tu,et al. Development of 3rd generation advanced high strength steel for automotive[J]. Steel Rolling,2019,36(5):1.)
[6] De Cooman B C,Lee S J,Shin S,et al. Combined intercritical annealing and Q&P processing of medium Mn steel[J]. Metallurgical and Materials Transactions A,2017,48(1):39.
[7] De Moor E,Lacroix S,Clarke A J,et al. Effect of retained austenite stabilized via quench and partitioning on the strain hardening of martensitic steels[J]. Metallurgical and Materials Transactions A,2008,39(11):2586.
[8] Santofimia M J,Nguyen-Minh T,Zhao L. New low carbon Q&P steels containing film-like intercritical ferrite[J]. Materials Science and Engineering A,2010,527:6429.
[9] Liu F,Song S J,Sommer F,et al. Evaluation of the maximum transformation rate for analyzing solid-state phase transformation kinetics[J]. Acta Materialia,2009,57(20):6176.
[10] Schmidt E D,Damm E B,Sridhar S. A study of diffusion-and interface-controlled migration of the austenite/ferrite front during austenitization of a case-hardenable alloy steel[J]. Metallurgical and Materials Transactions A,2007,38(2):244.
[11] Chen H,van der Zwaag S. A general mixed-mode model for the austenite-to-ferrite transformation kinetics in Fe-C-M alloys[J]. Acta Materialia,2014,72:1.
[12] Sietsma J,van der Zwaag S. A concise model for mixed-mode phase transformations in the solid state[J]. Acta Materialia,2004,52(14):4143.
[13] Krielaart G P,Van der Zwaag S. Simulations of pro-eutectoid ferrite formation using a mixed control growth model[J]. Materials Science and Engineering:A,1998,246(1/2):104.
[14] YANG Y G,MI Z L,XU M,et al. Bending deformation and fracture characterisation in quenching and partitioning steel[J]. Materials Science and Technology,2018,34(11):1379.
[15] Liu Y,Sommer F,Mittemeijer E J. Abnormal austenite-ferrite transformation kinetics of ultra-low-nitrogen Fe-N alloy[J]. Metallurgical and Materials Transactions A,2008,39(10):2306.
[16] Liu F,Sommer F,Mittemeijer E J. An analytical model for isothermal and isochronal transformation kinetics[J]. Journal of Materials Science,2004,39(5):1621.
[17] Liu Y C,Sommer F,Mittemeijer E J. Kinetics of the abnormal austenite-ferrite transformation behaviour in substitutional Fe-based alloys[J]. Acta Materialia,2004,52(9):2549.