成分对真空脱锰法相变控制高硅电工钢<strong>{100}</strong>织构的影响

doi:10.11900/0412.1961.2021.00086

金属学报

2022, Vol. 58

Issue (10): 1261-1270 DOI: 10.11900/0412.1961.2021.00086

研究论文

本期目录 | 过刊浏览

成分对真空脱锰法相变控制高硅电工钢{100}织构的影响

杨平¹(

), 王金华¹, 马丹丹¹, 庞树芳², 崔凤娥³

^1.北京科技大学材料科学与工程学院北京 100083
^2.鞍钢集团钢铁研究院鞍山 114000
^3.北京科技大学新材料技术研究院北京 100083

Influences of Composition on the Transformation-Controlled {100} Textures in High Silicon Electrical Steels Prepared by Mn-Removal Vacuum Annealing

YANG Ping¹(

), WANG Jinhua¹, MA Dandan¹, PANG Shufang², CUI Feng'e³

^1.School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
^2.Iron and Steel Research Institute, Angang Group, Anshan 114000, China
^3.Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China

引用本文:

杨平, 王金华, 马丹丹, 庞树芳, 崔凤娥. 成分对真空脱锰法相变控制高硅电工钢{100}织构的影响[J]. 金属学报, 2022, 58(10): 1261-1270.
Ping YANG, Jinhua WANG, Dandan MA, Shufang PANG, Feng'e CUI. Influences of Composition on the Transformation-Controlled {100} Textures in High Silicon Electrical Steels Prepared by Mn-Removal Vacuum Annealing[J]. Acta Metall Sin, 2022, 58(10): 1261-1270.

全文: PDF(3502 KB) HTML

摘要:

在前期真空脱锰、湿氢脱碳的表面相变控制技术制备强{100}织构工艺优化工作的基础上,考察4种3%Si电工钢中成分变化对{100}织构中的立方织构、25°旋转立方织构和旋转立方织构的影响,并通过计算相图考察具有立方织构脱锰层合金的相图特点,为定量控制成分、优化织构奠定理论基础。实验结果及相图计算结果表明,在通常有利于立方织构形成的50%中等压下量下,4种合金中具有低C、低Mn的高相变点合金较快形成较强立方织构的脱锰层,该合金在真空下1100℃、30 min保温后,脱锰层中{100}晶粒的面积分数可达77.3%。

关键词 ：电工钢, 织构, 脱锰, 真空退火, 相变, 表面效应

Abstract：

Laboratory experiments demonstrate that the magnetic-beneficial {100} texture can be strongly produced using the so-called surface effect transformation treatment either in low-grade electrical steels or in high-grade 3%Si steels. In the latter case, the solid-phase transformation is introduced into Si steels by adding carbon and manganese elements. In addition, vacuum annealing and subsequent wet hydrogen decarburization are needed. Although such treatment differs remarkably from conventional industry production facilities, its superiority of producing extremely sharp {100} texture, immensely high magnetic induction, and low core loss keeps the method attractive for environmental friendly and high-efficiency rotating machines. Our previous results indicated that the heavy rolling reduction favors the rotated cube texture {100}<011> formation; however, the cube texture {100}<001> is expected due to the easiness of sheet cutting for iron core production in the industry. In this study, the influences of compositions on the formation of the cube texture, 25°-rotated cube texture, and rotated cube texture were investigated. The phase diagram features of the alloy consisting of strong cube texture were also examined. The aim is to establish the theoretical bases for quantitative control of the alloy composition suitable for cube texture in 3%Si electrical steels. Four steel compositions are designed using different combinations of carbon and manganese contents. Thus, the transformation temperatures, ferrite grain sizes, and pearlite volume fractions will be different, leading to distinct growth rates of {100} oriented grains during vacuum annealing at a constant temperature. They were cold-rolled by 50% reduction, which is beneficial for the cube texture formation. The results of experimental determination and calculated phase diagrams indicate that the alloy with lower carbon and Mn contents in the investigated four steel compositions shows a faster and stronger cube texture in the Mn-removal surface layer. The area fraction of the {100} texture in the Mn-removal layer of the alloy after vacuum annealing at 1100^oC for 30 min reaches 77.3%. In addition, the suitable decarburization temperature after the formation of the Mn-removal surface layer is discussed and suggested based on the calculated phase diagrams.

Key words： electrical steel texture manganese removal vacuum annealing transformation surface effect

收稿日期: 2021-02-26

ZTFLH:

TG111.5

基金资助:国家自然科学基金项目(51771024);国家自然科学基金项目(51931002)

作者简介: 杨平,男,1959年生,教授,博士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2021.00086 或 https://www.ams.org.cn/CN/Y2022/V58/I10/1261

表1 4种合金的成分、热轧参数、平衡相变点及平衡时珠光体体积分数

图1 4种合金热轧后(冷轧前)显微组织的OM像

图2 4种合金在50%压下量下冷轧的φ2 = 45°截面取向分布函数(ODF)图

图3 4种合金冷轧后快速加热到1100℃真空退火30 min后显微组织的OM像

图4 4种合金1100℃真空退火脱锰30 min后表层组织的EBSD取向成像图及相应的{100}极图

表2 真空退火脱锰后4种合金表层晶粒信息

图5 4种合金中相的相对量与温度的关系

图6 4种合金对应的计算相图(温度与Mn含量的关系)

图7 4种合金中温度与C含量的关系相图

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