不同冷速下水电工程用780 MPa级低碳贝氏体钢的组织与硬度

doi:10.13251/j.issn.0254-6051.2025.10.015

金属热处理 ›› 2025, Vol. 50 ›› Issue (10): 99-103.DOI: 10.13251/j.issn.0254-6051.2025.10.015

不同冷速下水电工程用780 MPa级低碳贝氏体钢的组织与硬度

黄新贵, 王少义, 赵燕青, 石帅, 宋宏龙, 白丽娟, 赵林林

河钢集团有限公司, 河北石家庄 050400

收稿日期:2025-04-15 修回日期:2025-07-24 出版日期:2025-10-25 发布日期:2025-11-04
通讯作者: 王少义,高级工程师,硕士,E-mail: wgwangshaoyi@hbisco.com
作者简介:黄新贵(1994—),男,助理工程师,硕士,主要研究方向为中厚板材研发,E-mail: huangxingui@hbisco.com。

Microstructure and hardness of 780 MPa low-carbon bainite steel for hydropower engineering at different cooling rates

Huang Xingui, Wang Shaoyi, Zhao Yanqing, Shi Shuai, Song Honglong, Bai Lijuan, Zhao Linlin

HBIS Group Co., Ltd., Shijiazhuang Hebei 050400, China

Received:2025-04-15 Revised:2025-07-24 Online:2025-10-25 Published:2025-11-04

摘要/Abstract

摘要： 利用DIL805L型淬火膨胀仪测定了水电工程用780 MPa级低碳贝氏体钢的相变临界点及CCT曲线,并对其不同冷速下的组织和硬度进行了观察和测量。结果表明,试验钢的临界相变温度Ac₁=719 ℃,Ac₃=890 ℃。在0.5~100 ℃/s冷速下,试验钢连续冷却转变过程中发生了贝氏体转变和马氏体转变。当冷速为0.5~1 ℃/s时,组织为粒状贝氏体;当冷速提升到2 ℃/s时,开始出现板条状贝氏体;当冷速为5 ℃/s及以上时,组织为板条状马氏体+贝氏体,且随冷却速度增加,马氏体含量增加。随冷速提高,试验钢的硬度呈增加趋势,当冷速达到5 ℃/s时,硬度骤增,之后随冷速增加,硬度小幅提升。

关键词: 低碳贝氏体钢, 静态CCT曲线, 贝氏体, 马氏体, 硬度

Abstract: Phase transformation critical points and continuous cooling transformation (CCT) curve of 780 MPa low-carbon bainitic steel for hydropower engineering were measured using DIL805L quenching dilatometer, and the microstructure and hardness of the steel under different cooling rates were observed and measured. The results show that the critical phase transformation temperature of the tested steel is Ac₁=719 ℃ and Ac₃=890 ℃. Under the cooling rate range of 0.5-100 ℃/s, bainitic transformation and martensitic transformation occur during the continuous cooling transformation process of the steel. When the cooling rate is 0.5-1 ℃/s, the microstructure is granular bainite. When the cooling rate increases to 2 ℃/s, lath bainite begins to appear. When the cooling rate is 5 ℃/s or higher, the microstructure consists of lath martensite + bainite. And as the cooling rate increases, the content of martensite increases. As the cooling rate increases, the hardness of the steel shows an increasing trend. When the cooling rate reaches 5 ℃/s, the hardness increases sharply, and with the cooling rate continues to increase, the hardness increases slightly.

Key words: low-carbon bainite steel, static CCT curve, bainite, martensite, hardness

中图分类号:

TG142

黄新贵, 王少义, 赵燕青, 石帅, 宋宏龙, 白丽娟, 赵林林. 不同冷速下水电工程用780 MPa级低碳贝氏体钢的组织与硬度[J]. 金属热处理, 2025, 50(10): 99-103.

Huang Xingui, Wang Shaoyi, Zhao Yanqing, Shi Shuai, Song Honglong, Bai Lijuan, Zhao Linlin. Microstructure and hardness of 780 MPa low-carbon bainite steel for hydropower engineering at different cooling rates[J]. Heat Treatment of Metals, 2025, 50(10): 99-103.

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不同冷速下水电工程用780 MPa级低碳贝氏体钢的组织与硬度

Microstructure and hardness of 780 MPa low-carbon bainite steel for hydropower engineering at different cooling rates

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