Effect of Over-aging Process on Microstructure and Properties of Low-carbon Cold-rolled Steel for Enameling

doi:10.11901/1005.3093.2015.483

Chinese Journal of Materials Research

2016, Vol. 30

Issue (11): 834-840 DOI: 10.11901/1005.3093.2015.483

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Effect of Over-aging Process on Microstructure and Properties of Low-carbon Cold-rolled Steel for Enameling

Fei XUE¹,Futao DONG^2,^**(

),Linxiu DU³,Xianghua LIU³

1. College of Electrical Engineering, North China University of Science and Technology, Tangshan 063009, China
2. College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063009, China
3. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China

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Fei XUE, Futao DONG, Linxiu DU, Xianghua LIU. Effect of Over-aging Process on Microstructure and Properties of Low-carbon Cold-rolled Steel for Enameling. Chinese Journal of Materials Research, 2016, 30(11): 834-840.

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Abstract

The effect of over-aging process on mechanical properties and hydrogen permeation behavior of a cold-rolled model low carbon steel sheet for enameling was investigated by means of a continuous annealing simulator, which aims to simulate the over-aging process in continuous annealing line in steel works. It was found that the cementite precipitates within grains became finer but possessed large volume fraction in the steel sheet annealed with the slow cooling over-aging process, in the contrast to the conventional isothermal over-aging process. The strength of sheets annealed with the slow cooling over-aging was slightly lower but with significantly enhanced elongation . With the increasing effect of hydrogen traps due to the higher amount of finer precipitates of cementite within ferrite grains, the hydrogen diffusion in the steel was hindered. The hydrogen diffusion coefficient, D_L for the sheet annealed with using slow cooling over-aging process was reduced by approx. 18% in comparison with those with the conventional isothermal over-aging process. Therewith, the mechanical property and fish-scaling resistance of the low-carbon cold-rolled steel sheet for enameling can be significantly improved by this improved over-aging process.

Key words: metallic materials enamel steel over-aging cementite fish-scale resistance

Received: 31 October 2015

Fund: *Supported by the National Natural Science Foundation of China No. 51501056, Natural Science Foundation of Hebei Province No. E2016209341, Science Foundation of Educational Commission of Hebei Province No. BJ2014031, Project of Science and Technology of Tangshan Nos. 14130243B & 15130202C and Foundation of North China university of science and technology No. JP201510.

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	Fei XUE
	Futao DONG
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	Xianghua LIU

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https://www.cjmr.org/EN/10.11901/1005.3093.2015.483 OR https://www.cjmr.org/EN/Y2016/V30/I11/834

Fig.1 Simulated fast continuous annealing process curve and parameters

Fig.2 Experimental setup of electrochemical hydrogen permeation experiment (a) Cabinet, (b) Galvanostat, (c) Potentiostat, (d) Polishing tank, (e) Heating panel, (f) Cathode tank, (g) Plating tank, (h) Hydrogen charging and releasing electrolytic cell, (i) Reservoir, (j) Computer

Fig.3 Micrograph of hot-strip (a) Optical micrograph (b) SEM micrograph

Fig.4 Optical micrographs of annealed sheets by using different over-aging processes (a) isothermic, (b) slow cooling

Table 1 Quantitative analysis of cementite particles within ferrite grains

Fig.5 SEM micrographs showing cementite particles within ferrite grains taken from annealed sheets using different over-aging processes (a) isothermic, (b) slow cooling

Fig.6 Size distributions of cementite particles within ferrite grains in annealed sheets using different over-aging processes (a) isothermic, (b) slow cooling

Fig.7 TEM micrographs of annealed sheet (a) MnS, (b) EDX analysis of MnS, (c) AlN, (d) EDX analysis of AlN

Table 2 Mechanical properties of annealed sheets

Fig.8 Hydrogen permeation curves of annealed sheets at room temperature

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