正火轧制对Q460钢典型层面强韧性及取向分布的影响

doi:10.13289/j.issn.1009-6264.2021-0263

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材料热处理学报 ›› 2021, Vol. 42 ›› Issue (12) : 102-108. DOI: 10.13289/j.issn.1009-6264.2021-0263

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黑色金属合金材料

正火轧制对Q460钢典型层面强韧性及取向分布的影响

黄曼丽, 李志超, 武会宾, 宁博, 刘金旭

作者信息 +

Effect of normalizing rolling on strength-toughness and orientation distribution of typical layer of Q460 steel

HUANG Man-li, LI Zhi-chao, WU Hui-bin, NING Bo, LIU Jin-xu

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文章历史 +

摘要

首先采用"正火轧制"和"热轧+正火"工艺对Q460低合金高强钢进行了处理，随后利用扫描电镜（SEM）和电子背散射衍射（EBSD）技术对试验钢经不同工艺处理后不同层面的显微组织和微观取向进行了研究。结果表明：典型层面微观组织及织构的不同造成了两种工艺下Q460钢强韧性的差异。试验钢经两种工艺处理后的显微组织均为"铁素体+珠光体"的混合组织，但相比正火钢板，正火轧制钢板的1/4厚度处的珠光体片层间距明显较大，虽然两个样品的珠光体含量相当，但由于正火轧制钢板内储存了较多的畸变、位错等缺陷，导致正火轧制钢板的拉伸性能略高。正火轧制试样1/4和1/2厚度处的平均有效晶粒尺寸分别为7.43和9.18 μm、正火试样1/4和1/2厚度处的平均有效晶粒尺寸分别为6.08和6.24 μm，晶粒尺寸的不同是试样冲击性能差异的一个原因，织构类型及含量则是冲击性能差异的另一个原因。

Abstract

Firstly, Q460 high strength low alloy steel was treated by "normalizing+rolling" and "hot rolling + normalizing", and then the microstructure and micro orientation of different layers of the experimental steel treated by different processes were studied by scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD) technique. The results show that the difference of microstructure and texture of typical layer leads to the difference of strength and toughness of the Q460 steel under the two processes. The microstructure of the experimental steel treated by the two processes is a mixed structure of "ferrite + pearlite", but compared with the normalized steel plate, the pearlite interlamellar spacing at 1/4 thickness of the normalized rolled steel plate is obviously larger. Although the pearlite content of the two samples is the same, there are more distortion, dislocation and other defects stored in the normalized rolled steel plate, as a result, the tensile properties of the normalized rolled steel plate are slightly higher than that of the normalized steel plate. The average effective grain sizes at 1/4 and 1/2 thickness of the normalized rolled samples are 7.43 and 9.18 μm, respectively, and the average effective grain sizes at 1/4 and 1/2 thickness of the normalized samples are 6.08 and 6.24 μm, respectively. The difference of grain size is one reason for the difference of impact properties of the samples, and the type and content of texture are another reason for the difference of impact properties.

导出引用

黄曼丽, 李志超, 武会宾, 宁博, 刘金旭. 正火轧制对Q460钢典型层面强韧性及取向分布的影响[J]. 材料热处理学报, 2021, 42(12): 102-108 https://doi.org/10.13289/j.issn.1009-6264.2021-0263

HUANG Man-li, LI Zhi-chao, WU Hui-bin, NING Bo, LIU Jin-xu. Effect of normalizing rolling on strength-toughness and orientation distribution of typical layer of Q460 steel[J]. Transactions of Materials and Heat Treatment, 2021, 42(12): 102-108 https://doi.org/10.13289/j.issn.1009-6264.2021-0263

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