冷却工艺对Q500qE桥梁钢组织与性能的影响

doi:10.13251/j.issn.0254-6051.2023.06.024

金属热处理 ›› 2023, Vol. 48 ›› Issue (6): 130-135.DOI: 10.13251/j.issn.0254-6051.2023.06.024

冷却工艺对Q500qE桥梁钢组织与性能的影响

武凤娟, 杨浩, 曲锦波

江苏省沙钢钢铁研究院, 江苏张家港 215625

收稿日期:2022-11-29 修回日期:2023-05-05 发布日期:2023-08-11
通讯作者: 曲锦波,工程师,博士,E-mail:qujb-iris@shasteel.cn
作者简介:武凤娟(1986—),女,工程师,硕士,主要研究方向为热轧板带材产品的开发,E-mail:xiaowufj@163.com。

Effect of cooling process on microstructure and mechanical property of Q500qE bridge steel

Wu Fengjuan,Yang Hao, Qu Jinbo

Institute of Research of Iron and Steel, Shagang, Jiangsu Province, Zhangjiagang Jiangsu 215625, China

Received:2022-11-29 Revised:2023-05-05 Published:2023-08-11

摘要/Abstract

摘要： 以高强度桥梁钢Q500qE为对象, 研究不同冷却工艺对其组织和性能的影响规律。研究表明, 低速冷却(5 ℃/s)工艺所得组织以粒状贝氏体为主, M/A岛尺寸粗大, 虽然屈强比较低, 但强度偏低, 韧性较差;高速冷却(25 ℃/s)工艺所得组织以板条贝氏体为主, M/A岛呈球状或棒状, 强度和韧性均得到较大提升, 但屈强比偏高;分段冷却(20 ℃/s+空冷+20 ℃/s)工艺所得组织为多边形铁素体+板条贝氏体+粒状贝氏体的复合组织, M/A岛细小弥散, 屈强比最低, 韧性最高, 综合性能最佳。

关键词: Q500qE桥梁钢, 冷却工艺, M/A岛, 屈强比, 低温韧性

Abstract: Taken high-strength bridge steel Q500qE as the object, the influence of different cooling processes on its microstructure and properties were studied. The results show that under the low speed cooling process (5 ℃/s), the microstructure mainly consists of granular bainite with coarse M/A islands, which exhibits a low strength and poor toughness, in spite of a low yield ratio. The high speed cooling process (25 ℃/s) leads to a lath bainite dominant microstructure with spherical and rod-like M/A islands, with a much improved strength and toughness, but a high yield ratio. Upon the interrupted cooling process (20 ℃/s+air cooling+20 ℃/s), a multiphase microstructure, containing polygonal ferrite, lath bainite and granular bainite, with fine and dispersed M/A islands, is obtained, which results in the lowest yield ratio, highest toughness, and best overall properties.

Key words: Q500qE bridge steel, cooling process, M/A island, yield ratio, low temperature toughness

中图分类号:

TG142.4

武凤娟, 杨浩, 曲锦波. 冷却工艺对Q500qE桥梁钢组织与性能的影响[J]. 金属热处理, 2023, 48(6): 130-135.

Wu Fengjuan, Yang Hao, Qu Jinbo. Effect of cooling process on microstructure and mechanical property of Q500qE bridge steel[J]. Heat Treatment of Metals, 2023, 48(6): 130-135.

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冷却工艺对Q500qE桥梁钢组织与性能的影响

Effect of cooling process on microstructure and mechanical property of Q500qE bridge steel

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