正火温度对海工用355 MPa级厚规格型钢组织及低温韧性的影响

doi:10.13251/j.issn.0254-6051.2021.06.021

金属热处理 ›› 2021, Vol. 46 ›› Issue (6): 102-106.DOI: 10.13251/j.issn.0254-6051.2021.06.021

正火温度对海工用355 MPa级厚规格型钢组织及低温韧性的影响

赵培林, 刘超, 吴会亮, 郑力

山东钢铁股份有限公司技术中心, 山东济南 271105

收稿日期:2021-02-17 出版日期:2021-06-25 发布日期:2021-07-21
作者简介:赵培林(1973—),男,博士,研究员,主要研究方向为钢铁新材料研发与新工艺新技术,E-mail:zhaopeilin@163.com。
基金资助:
国家重点研发计划(2016YFB0300603)

Effect of normalizing temperature on microstructure and low temperature toughness of 355 MPa heavy section steel for marine engineering

Zhao Peilin, Liu Chao, Wu Huiliang, Zheng Li

R&D Center, Shandong Iron & Steel Co., Ltd., Jinan Shandong 271105, China

Received:2021-02-17 Online:2021-06-25 Published:2021-07-21

摘要/Abstract

摘要： 针对屈服强度355 MPa级厚规格热轧H型钢进行了正火处理;利用光学显微镜,扫描电镜分别对轧制态和890、920 ℃正火处理试验钢的显微组织进行观察;对比分析了试验钢不同状态下冲击性能变化,得出了组织状态与冲击性能的相关性规律。试验结果表明,随着正火温度升高,魏氏体等异常组织减少直至消失;试验钢厚度方向不同部位偏析现象有效减轻,珠光体片层间距变细,整体晶粒细化,心部和边部组织均匀性显著提高;-40 ℃低温冲击性能显著提升,心部和边部冲击吸收能量差值缩小,与组织状态变化规律相一致。

关键词: 正火处理, 厚规格型钢, 显微组织, 偏析, 冲击性能

Abstract: Normalizing experiment was carried out on hot-rolled H-beam steel with yield strength of 355 MPa. Microstructure of the tested steel in hot rolled state and normalized at 890 and 920 ℃ was observed by means of optical microscope and scanning electron microscope, respectively. The impact properties of the tested steel in different states were compared and analyzed, and the correlation between microstructure and impact toughness was obtained. The experimental results show that with the increase of normalizing temperature, the abnormal microstructure such as widmanstatten decreases and disappears at last. Meanwhile, the segregation phenomenon in different positions of the flange thickness direction of the tested steel is effectively reduced. The pearlite lamellar spacing becomes smaller and the overall grain is refined. Compared with the original microstructure, the normalized microstructure uniformity in the core and edge is significantly improved. The low temperature impact property at -40 ℃ is significantly improved, and the impact absorbed energy difference between the core and edge is reduced, which is consistent with the change of microstructure.

Key words: normalizing treatment, heavy section steel, microstructure, segregation, impact property

中图分类号:

TG142.7

赵培林, 刘超, 吴会亮, 郑力. 正火温度对海工用355 MPa级厚规格型钢组织及低温韧性的影响[J]. 金属热处理, 2021, 46(6): 102-106.

Zhao Peilin, Liu Chao, Wu Huiliang, Zheng Li. Effect of normalizing temperature on microstructure and low temperature toughness of 355 MPa heavy section steel for marine engineering[J]. Heat Treatment of Metals, 2021, 46(6): 102-106.

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正火温度对海工用355 MPa级厚规格型钢组织及低温韧性的影响

Effect of normalizing temperature on microstructure and low temperature toughness of 355 MPa heavy section steel for marine engineering

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