正火工艺对420 MPa级海上风电用钢板组织及性能的影响

doi:10.13251/j.issn.0254-6051.2021.10.019

金属热处理 ›› 2021, Vol. 46 ›› Issue (10): 112-116.DOI: 10.13251/j.issn.0254-6051.2021.10.019

正火工艺对420 MPa级海上风电用钢板组织及性能的影响

袁睿¹, 潘中德², 武会宾¹

1.北京科技大学钢铁共性技术协同创新中心, 北京 100083;
2.南京钢铁股份有限公司, 江苏南京 210035

收稿日期:2021-05-13 出版日期:2021-10-25 发布日期:2021-12-08
通讯作者: 武会宾,教授,博士生导师:E-mail:wuhb@ustb.edu.cn
作者简介:袁睿(1994—),男,博士研究生,主要研究方向为耐腐蚀高强钢的研究与开发,E-mail:1136115087@qq.com

Effect of normalizing process on microstructure and properties of 420 MPa grade steel plate for offshore wind power

Yuan Rui¹, Pan Zhongde², Wu Huibin¹

1. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China;
2. Nanjing Iron & Steel Co., Ltd., Nanjing Jiangsu 210035, China

Received:2021-05-13 Online:2021-10-25 Published:2021-12-08

摘要/Abstract

摘要： 利用扫描电镜、激光共聚焦显微镜、室温拉伸、低温冲击测试等试验方法,采用了正火、强化正火、正火+400 ℃回火的热处理工艺,研究了不同正火工艺对420 MPa级海洋风电用钢板组织和性能的影响。结果表明:通过正火处理后,正火态试验钢的平均晶粒尺寸由轧态试验钢的8 μm细化至6 μm,带状组织得到改善,强度与低温冲击性能均得到提升,屈服强度提升至442 MPa,－50 ℃下的冲击吸收能达到120 J;通过正火+400 ℃回火处理后,平均晶粒尺寸为7 μm,虽然大幅度提升了钢的低温冲击性能,－50 ℃下的冲击吸收能量达到194 J,但是钢的屈服强度降低为422 MPa。强化正火后组织为铁素体+珠光体+少量贝氏体,平均晶粒尺寸为5.6 μm,屈服强度提升至460 MPa,断后伸长率和低温冲击吸收能量相较于正火后试验钢有所降低但仍能满足EN10025性能标准,达到强韧性的最佳匹配,是生产420 MPa级海上风电用钢的最佳热处理工艺。

关键词: 正火, 带状组织, 铁素体, 海上风电钢板, 力学性能

Abstract: Effect of different heat treatment processes, which are normalizing, strengthening normalizing, normalizing+400 ℃ tempering, on the microstructure and properties of 420 MPa steel plate for offshore wind power was studied by means of scanning electron microscope, laser confocal microscope, room temperature tensile test, low temperature impact test and other experimental methods. The results show that after normalization, the average grain size of the steel is refined from 8 μm to 6 μm compared with that as-rolled, the band microstructure is improved, the strength and low-temperature impact property are improved as the impact absorbed energy at －50 ℃ reaching to 120 J and the yield strength increasing to 442 MPa. After normalizing+400 ℃ tempering, the average grain size is 7 μm, the low-temperature impact property of the steel is greatly improved (the impact absorbed energy at -50 ℃ can reach 194 J), but the yield strength reduces to 422 MPa. After strengthening normalization and compared with that of normalizing, the microstructure is composed of ferrite+pearlite+a small amount of bainite, the average grain size is refined to 5.6 μm, the yield strength is increased to 460 MPa, the elongation after fracture and the low-temperature impact absorbed energy are somewhat reduced but can meet the EN10025 performance standard and achieve the best match of strength and toughness. It is proved that the strengthening normalization is the best heat treatment process for the production of 420 MPa grade offshore wind power steel.

Key words: normalizing, band microstructure, ferrite, steel plate for offshore wind power, mechanical properties

中图分类号:

TG161

袁睿, 潘中德, 武会宾. 正火工艺对420 MPa级海上风电用钢板组织及性能的影响[J]. 金属热处理, 2021, 46(10): 112-116.

Yuan Rui, Pan Zhongde, Wu Huibin. Effect of normalizing process on microstructure and properties of 420 MPa grade steel plate for offshore wind power[J]. Heat Treatment of Metals, 2021, 46(10): 112-116.

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正火工艺对420 MPa级海上风电用钢板组织及性能的影响

Effect of normalizing process on microstructure and properties of 420 MPa grade steel plate for offshore wind power

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