再结晶退火对高硅电工钢冷轧带材组织、有序结构和力学性能的影响<sup>*</sup>

doi:10.11900/0412.1961.2015.00661

金属学报

2016, Vol. 52

Issue (11): 1363-1371 DOI: 10.11900/0412.1961.2015.00661

本期目录 | 过刊浏览

再结晶退火对高硅电工钢冷轧带材组织、有序结构和力学性能的影响^*

莫远科,张志豪(

),谢建新,潘洪江

北京科技大学新材料技术研究院, 北京 100083

EFFECTS OF RECRYSTALLIZATION ON THE MICROSTRUCTURE, ORDERING AND MECHANICALPROPERTIES OF COLD-ROLLED HIGH SILICON ELECTRICAL STEEL SHEET

Yuanke MO,Zhihao ZHANG(

),Jianxin XIE,Hongjiang PAN

Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China

引用本文:

莫远科,张志豪,谢建新,潘洪江. 再结晶退火对高硅电工钢冷轧带材组织、有序结构和力学性能的影响^*[J]. 金属学报, 2016, 52(11): 1363-1371.
Yuanke MO, Zhihao ZHANG, Jianxin XIE, Hongjiang PAN. EFFECTS OF RECRYSTALLIZATION ON THE MICROSTRUCTURE, ORDERING AND MECHANICALPROPERTIES OF COLD-ROLLED HIGH SILICON ELECTRICAL STEEL SHEET[J]. Acta Metall Sin, 2016, 52(11): 1363-1371.

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摘要:

采用弯曲实验, 拉伸实验, SEM, TEM和EBSD等手段, 研究了再结晶退火对高硅电工钢冷轧带材组织、有序结构、力学性能和冷轧成形性能的影响. 结果表明, 冷轧试样经800~1200 ℃保温1 h再结晶退火随炉缓冷后, 室温塑性大幅下降, 可弯曲角度均由冷轧试样的150°下降至50°左右, 且二次冷轧出现严重的边裂; 提高再结晶退火后的空冷或油淬温度、冷却速率可显著提高试样的室温塑性, 1000 ℃保温1 h再结晶退火后, 900 ℃油淬试样的可弯曲角度增大至175°左右, 拉伸断后伸长率由随炉缓冷试样的0.2%提高至5.2%, 且二次冷轧基本不出现边裂; 提高再结晶退火后的冷却温度和速率显著提高试样的室温塑性的原因是试样的有序相尺寸明显减小, 例如, 有序相畴尺寸可从600 ℃以下油淬试样的约5 μm分别减小至700 ℃油淬试样的小于50 nm和900 ℃油淬试样的小于25 nm.

关键词 ：高硅电工钢,, 冷轧,, 再结晶退火,, 有序度,, 力学性能

Abstract：

High silicon electrical steel (Fe-6.5%Si alloy, mass fraction) has excellent soft magnetic properties. However, the alloy is very brittle at room temperature and quite hard to be fabricated into cold-rolled sheet by conventional rolling process due to the existence of ordered phases. In recent years, high silicon electrical steel sheet has been successfully obtained though rolling process, and many studies have focused on the recrystallization of the alloy sheet in order to optimize the magnetic properties. Furthermore, it is necessary to further investigate the plasticity of recrystallized high silicon electrical steel sheet for improving the subsequent plastic deformation, such as coiling, uncoiling, blanking and secondary cold-rolling. In this study, effects of recrystallization on the microstructure, ordering, mechanical properties and cold-rolling workability of cold-rolled high silicon electrical steel samples were investigated by using SEM, TEM, EBSD, bending test, tensile test and cold-rolling. The results show that when the cold-rolled samples were recrystallized at 800~1200 ℃ for 1 h followed by furnace-cooling, the plasticity of the sample is sharply decreased, which is proved by the decrease of bending angles from about 150° to 50° and the occurrence of serious edge cracks after secondary cold-rolling. The plasticity of the recrystallized sample is significantly improved by increasing both the cooling temperature and cooling rate during the recrystallization. When the cold-rolled samples were recrystallized at 1000 ℃ for 1 h followed by oil-quenching from 900 ℃, the bending angles are increased to about 175°, the average elongation to failure are increased from 0.2% of furnace-cooling sample to 5.2%, and the secondary cold-rolling edge cracks are suppressed effectively. The plasticity improvement can be attributed to the refinement of ordered domain during recrystallization annealing with high cooling temperature and high cooling rate. For instance, the size of ordered domain in the sample by oil-quenching at 600 ℃ or below is about 5 μm, while the sizes in the samples by oil-quenching from 700 ℃ and 900 ℃ are reduced to less than 50 nm and 25 nm, respectively.

Key words： high silicon electrical steel, cold-rolling, recrystallization annealing, ordering, mechanical property

收稿日期: 2015-12-29

基金资助:* 国家重点基础研究发展计划项目2011CB606300和国家高技术研究发展计划项目2012AA03A505资助

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https://www.ams.org.cn/CN/10.11900/0412.1961.2015.00661 或 https://www.ams.org.cn/CN/Y2016/V52/I11/1363

图1 弯曲实验示意图

图2 高硅电工钢冷轧试样及其经1000 ℃保温1 h再结晶退火随炉缓冷后试样的弯曲宏观形貌

图3 冷轧试样及其经1000 ℃保温1 h再结晶退火随炉缓冷后的拉伸断口形貌的SEM像

图4 高硅电工钢冷轧试样的位错组态, 以及冷轧试样和1000 ℃保温1 h再结晶退火随炉缓冷试样在[001]晶带轴的SAED花样

图5 冷却条件对高硅电工钢再结晶退火试样弯曲性能的影响

图6 1000 ℃, 1 h再结晶退火后分别随炉缓冷和900℃油淬试样室温拉伸后的宏观形貌及微观组织

图7 1000 ℃, 1 h再结晶退火分别随炉缓冷和900 ℃油淬试样二次冷轧后的宏观形貌

图8 1000 ℃保温1 h再结晶退火后随炉缓冷和900 ℃油淬试样的EBSD像

图9 高硅电工钢冷轧试样1000 ℃保温1 h再结晶退火后不同冷却条件下的有序相畴

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