过时效工艺对低碳冷轧搪瓷钢组织性能的影响*

doi:10.11901/1005.3093.2015.483

材料研究学报

2016, Vol. 30

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

论文

本期目录 | 过刊浏览

过时效工艺对低碳冷轧搪瓷钢组织性能的影响*

薛飞¹,董福涛²(

),杜林秀³,刘相华³

1. 华北理工大学电气工程学院唐山 063009
2. 华北理工大学冶金与能源学院唐山 063009
3. 东北大学轧制技术与连轧自动化国家重点实验室沈阳 110819

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

引用本文:

薛飞, 董福涛, 杜林秀, 刘相华. 过时效工艺对低碳冷轧搪瓷钢组织性能的影响*[J]. 材料研究学报, 2016, 30(11): 834-840.
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[J]. Chinese Journal of Materials Research, 2016, 30(11): 834-840.

全文: PDF(4425 KB) HTML

摘要:

使用连续退火模拟实验机研究连续退火线上的过时效工艺对搪瓷钢力学性能和氢渗透行为的影响, 并探讨了性能与组织的关系。结果表明: 与传统等温过时效相比, 降温过时效退火板晶粒内的渗碳体颗粒不但体积分数更大, 且更加细小。降温过时效退火板的强度比等温过时效退火板的稍低, 断后伸长率明显更高。含量更高且更加细小弥散的晶粒内渗碳体具有更好的氢陷阱效果, 明显迟滞了氢在钢板中的扩散。与传统等温过时效相比, 降温过时效的实验钢退火板的氢扩散系数D_L降低了约18%。改进的过时效工艺, 使低碳冷轧搪瓷钢的力学性能和抗鳞爆性能明显提高。

关键词 ：金属材料, 搪瓷钢, 过时效, 渗碳体, 抗鳞爆性能

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

收稿日期: 2015-10-31

基金资助:* 国家自然科学基金项目51501056、河北省自然科学基金项目E2016209341, 河北省教育厅项目BJ2014031、唐山市科技计划项目14130243B&15130202C和华北理工大学培育基金项目JP201510

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图1 连续退火工艺曲线及参数

图2 电化学氢渗透设备照片

图3 热轧板的显微组织

图4 不同过时效工艺退火板的金相组织

表1 晶粒内渗碳体颗粒的定量分析

图5 不同过时效工艺的退火板铁素体晶粒内渗碳体颗粒的扫描照片

图6 不同过时效工艺退火板的铁素体晶粒内渗碳体颗粒的尺寸分布

图7 退火板的透射电镜照片

表2 退火板的力学性能

图8 退火板的室温氢渗透曲线

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