Influence of Carbon Content on Properties of an Ultra-Low Carbon Ti-Bearing Steel for Enameling

doi:10.11901/1005.3093.2016.447

Chinese Journal of Materials Research

2017, Vol. 31

Issue (12): 887-893 DOI: 10.11901/1005.3093.2016.447

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Influence of Carbon Content on Properties of an Ultra-Low Carbon Ti-Bearing Steel for Enameling

Futao DONG¹(

), Fei XUE², Linxiu DU³, Xianghua LIU³

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

Cite this article:

Futao DONG, Fei XUE, Linxiu DU, Xianghua LIU. Influence of Carbon Content on Properties of an Ultra-Low Carbon Ti-Bearing Steel for Enameling. Chinese Journal of Materials Research, 2017, 31(12): 887-893.

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Abstract

The effect of carbon content on microstructure, texture and hydrogen permeation behavior of an ultra-low carbon Ti-bearing steel for enameling was investigated by means of transmission electron microscope (TEM), electron backscattered diffraction (EBSD) test and electrochemical hydrogen permeation experiment. It was found that the strength of the annealed steel sheets increases with the increasing carbon content, but little difference for the n value; the elongation and r value show a trend of decrease with the increase of carbon content; corresponding to the r value, the γ-fiber texture of the annealed steel sheets was weakened gradually with the increase of carbon content. The hydrogen diffusion coefficient, D_L decreases with the increasing of carbon content, when carbon content below 0.004%, D_L is lower than the critical value, thereby the fish-scaling resistance for the steel sheet cannot be guaranteed for the enameling process.

Key words: metallic materials enamel steel precipitate texture fish-scale resistance

Received: 30 November 2016

ZTFLH:

TG142

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

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.447 OR https://www.cjmr.org/EN/Y2017/V31/I12/887

Fig.1 Simulated fast continuous annealing process curve and parameters

Table 1 Chemical compositions (mass fraction, %) of investigated steels

Fig.2 Optical micrographs of the investigated steel annealed sheets with different carbon contentv (a) Steel-1, 0.0024%C, (b) Steel-2, 0.0041%C, (c) Steel-3, 0.0060%C, (d) Steel-4, 0.0091%C

Fig.3 SEM micrographs of precipitates and their corresponding EDS spectrums in Steel-3 annealed sheet: (a) TiN+AlN, (b) TiN+TiS, (c) TiS, (d) Ti₄C₂S₂

Fig.4 TEM micrographs of precipitates and their corresponding EDS spectrums in Steel-3 annealed sheet (a) Ti₄C₂S₂, (b) Ti(C, N)

Fig.5 Stress-strain curves along the rolling direction from tension test at room temperature (a) and strength (b) of the investigated steel annealed sheets with different carbon contents

Fig.6 (a) The n values (work-hardening exponent), r_m values (average plastic anisotropy ratio) and (b) elongations, A₅₀ of the investigated steel annealed sheets with different carbon contents

Fig.7 ODFs (orientation density function in φ₂ =0~90° sections) of the investigated steel annealed sheets with different carbon contents (a) Steel-1, 0.0024%C (b) Steel-2, 0.0041%C (c) Steel-3, 0.0060%C (d) Steel-4, 0.0091%C

Fig.8 Lag time, t_L and hydrogen diffusion coefficient, D_L of annealed sheets at room temperature

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