非均质组织对高强度风电钢拉伸性能的影响

doi:10.11901/1005.3093.2024.496

材料研究学报

2025, Vol. 39

Issue (11): 801-812 DOI: 10.11901/1005.3093.2024.496

研究论文

本期目录 | 过刊浏览

非均质组织对高强度风电钢拉伸性能的影响

陈子豪¹^,², 高崇², 庞建超²(

), 麻衡³^,⁴, 何康³^,⁵, 李小武¹, 李守新², 张哲峰²

^1.东北大学材料科学与工程学院沈阳 110819
^2.中国科学院金属研究所沈阳材料科学国家研究中心沈阳 110016
^3.山钢股份莱芜分公司技术中心济南 271104
^4.北京科技大学冶金与生态工程学院北京 100083
^5.北京科技大学钢铁共性技术协同创新中心北京 100083

Effect of Different Heterogeneous Microstructures on Tensile Properties of a High Strength Wind Power Steel Q500MD

CHEN Zihao¹^,², GAO Chong², PANG Jianchao²(

), MA Heng³^,⁴, HE Kang³^,⁵, LI Xiaowu¹, LI Shouxin², ZHANG Zhefeng²

^1.School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
^2.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^3.Laiwu Branch Technology Center, Shandong Iron and Steel Co. , Ltd. , Jinan 271104, China
^4.School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
^5.Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China

引用本文:

陈子豪, 高崇, 庞建超, 麻衡, 何康, 李小武, 李守新, 张哲峰. 非均质组织对高强度风电钢拉伸性能的影响[J]. 材料研究学报, 2025, 39(11): 801-812.
Zihao CHEN, Chong GAO, Jianchao PANG, Heng MA, Kang HE, Xiaowu LI, Shouxin LI, Zhefeng ZHANG. Effect of Different Heterogeneous Microstructures on Tensile Properties of a High Strength Wind Power Steel Q500MD[J]. Chinese Journal of Materials Research, 2025, 39(11): 801-812.

全文: PDF(29253 KB) HTML

摘要:

对500 MPa级风电钢进行以临界退火为主的热处理并与淬火或回火相结合，即分别进行临界退火、淬火+临界退火与淬火+临界退火+回火均质化热处理，得到3种具有不同非均质组织的风电钢试样。使用扫描电镜和电子背散射衍射技术观察试样的微观组织，并对原始态等4组试样进行拉伸实验并观察拉伸断口，研究了非均质组织对高强度风电钢拉伸性能的影响。结果表明，非均质化热处理后试样的微观组织转变为软相临界铁素体和硬相马氏体的非均质组织，淬火+临界退火处理后试样的组织转变为临界铁素体、粒状马氏体及纤维状马氏体。试样中的非均质组织在临界退火过程中的非均匀形核使其产生了新的组织并使晶粒细化。这种非均质组织结构使这种高强度风电钢具有较低的屈强比和高塑性。与原始态组织相比，钢中的软相临界铁素体改变了试样在拉伸变形过程中初始屈服阈值和随后的加工硬化行为，使其具有较低的屈强比。不同非均质化热处理试样的组织演变和拉伸性能表明，临界退火处理后组织中的临界铁素体和马氏体使高强度风电钢的强度和塑性提高；在临界退火前加入淬火处理使微观组织中的晶粒更加细小而使其屈强比降低。

关键词 ：金属材料, 高强度风电钢, 临界退火, 非均质组织, 拉伸性能

Abstract：

The effect of different heterogeneous microstructures on the tensile properties of high-strength wind power steel Q500MD, a 500 MPa grade wind power steel was assessed. Hence, the as received steel is subjected to an intercritical annealing combined with quenching or tempering one, namely the following three heterogeneous heat treatments: intercritical annealing, quenching + intercritical annealing and quenching + intercritical annealing + tempering. Then the microstructure and tensile property of the acquired three type steels with different heterogeneous microstructures were examined viauniversal testing machine, scanning electron microscopy and electron backscatter diffraction. The results indicate that the as received steel presents typical thermo-mechanical control process (TMCP) heat treatment microstructure composed of a large amount of acicular ferrite and a small amount of martensite. After heterogeneous heat treatment, their microstructures transform into a heterogeneous microstructure of soft phase intercritical ferrite and hard phase martensite, and the martensite varies with different post heat treatment processes. Specifically, the steel microstructure turns into intercritical ferrite, granular martensite, and fibrous martensite after quenching and intercritical annealing. Due to the existence of heterogeneous nucleation in the intercritical annealing process, new microstructure can be generated and grain refinement can be achieved. The heterogeneous microstructure leads to a low yield ratio and high plasticity of high-strength wind power steels. Compared with the as received steel, the presence of the soft-phase intercritical ferrite alters the initial yield threshold and subsequent work hardening behavior of the steel during tensile deformation, resulting in low yield ratio. Based on the analysis of microstructure evolution and tensile properties of the steels prepared by different heterogeneous heat treatment, it can be concluded that the presence of intercritical ferrite and martensite in the microstructure after intercritical annealing can enhance the strength and plasticity of high-strength wind power steels. Furthermore, incorporating quenching prior to intercritical annealing yields a finer grain structure, thereby further reducing the yield ratio of high-strength wind power steels.

Key words： metallic materials high strength wind power steel intercritical annealing heterogeneous microstructure tensile property

收稿日期: 2024-12-15

ZTFLH:

TG142.1

基金资助:国家重点研发计划(2022YFB3708200)

通讯作者: 庞建超，副研究员，jcpang@imr.ac.cn，研究方向为材料疲劳与断裂

Corresponding author: PANG Jianchao, Tel: (024)83978879, E-mail: jcpang@imr.ac.cn

作者简介: 陈子豪，男，2000年生，硕士

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https://www.cjmr.org/CN/10.11901/1005.3093.2024.496 或 https://www.cjmr.org/CN/Y2025/V39/I11/801

图1 Q500MD钢的热处理工艺示意图

图2 拉伸试样的尺寸

图3 不同制度热处理后500 MPa级风电钢的微观组织

图4 不同制度热处理后500 MPa级风电钢的微观结构形态和边界分布的带衬度

图5 不同制度热处理后500 MPa级风电钢的KAM图

表1 不同制度热处理后500 MPa级风电钢的拉伸性能

图6 不同制度热处理后500 MPa级风电钢的拉伸工程应力-应变曲线

图7 不同制度热处理后500 MPa级风电钢的拉伸断口形貌

图8 基于EBSD结果不同制度热处理后500 MPa级风电钢的反极图

图9 非均质热处理后钢的微观组织结构变化

图10 不同制度热处理后500 MPa级风电钢的晶粒尺寸分布

图11 不同制度热处理后500 MPa级风电钢的拉伸性能与平均晶粒尺寸的关系

图12 不同制度热处理后500 MPa级风电钢的K-M曲线

图13 不同制度热处理后500 MPa级风电钢的拉伸性能

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