金属热处理 ›› 2025, Vol. 50 ›› Issue (10): 232-236.DOI: 10.13251/j.issn.0254-6051.2025.10.037

• 工艺研究 • 上一篇    下一篇

回火温度对XTP550超高强钢板组织与性能的影响

李晨潇1, 顾红2, 侯美伶1, 黄军1, 杨康帅1   

  1. 1.江阴兴澄特种钢铁有限公司, 江苏 江阴 214400;
    2.上海振华重工(集团)股份有限公司, 上海 200125
  • 收稿日期:2025-05-09 修回日期:2025-08-20 出版日期:2025-10-25 发布日期:2025-11-04
  • 作者简介:李晨潇(1990—),女,工程师,学士,主要研究方向为高强与超高强钢的开发,E-mail: lichenxiao1226@163.com

Effect of tempering temperature on microstructure and properties of XTP550 ultra-high strength steel plate

Li Chenxiao1, Gu Hong2, Hou Meiling1, Huang Jun1, Yang Kangshuai1   

  1. 1. Jiangyin Xingcheng Special Steel works Co., Ltd., Jiangyin Jiangsu 214400, China;
    2. Shanghai Zhenhua Heavy Industries Co., Ltd., Shanghai 200125, China
  • Received:2025-05-09 Revised:2025-08-20 Online:2025-10-25 Published:2025-11-04

摘要: 针对4 mm厚XTP550超高强钢热轧板,对其进行880 ℃淬火及不同温度(160~600 ℃)的回火处理,研究回火温度对XTP550钢板组织和性能的影响。结果表明,试验钢板淬火态组织为板条状马氏体,强度高但塑韧性不足。在160~600 ℃回火区间内,组织随温度升高依次转变为回火马氏体、回火托氏体、回火索氏体,碳化物逐渐聚集长大。在该回火区间内,试验钢板的强度与硬度逐渐降低,断后伸长率及冲击吸收能量整体则呈先降低后升高的特征,其中300 ℃和400 ℃回火时,塑韧性处于低值,同时冷弯性能下降。综合考虑力学性能的变化规律,最终确定合适的回火温度为200 ℃。采用880 ℃×30 min淬火+200 ℃×160 min回火的工艺进行工业试制,所得钢板的屈服强度为1456 MPa、抗拉强度为1852 MPa、断后伸长率为10.5%、硬度为552 HBW、-40 ℃冲击吸收能量为35 J,强韧性匹配及冷弯性能良好。

关键词: XTP550超高强钢, 回火温度, 组织, 性能

Abstract: Effect of tempering temperature on microstructure and properties of 4 mm thick XTP550 ultra-high strength steel hot-rolled plate was investigated by quenching at 880 ℃ and then tempering at different temperatures ranging from 160 ℃ to 600 ℃. The results show that the as-quenched microstructure of the tested steel is lath martensite, which has high strength but insufficient plasticity and toughness. Within the tempering temperature range of 160-600 ℃, the microstructure transforms sequentially into tempered martensite, tempered troostite, and tempered sorbite as the temperature increases, with carbides gradually precipitating and growing. In this tempering temperature range, the strength and hardness of the tested steel decrease gradually, while the overall elongation after fracture and impact absorbed energy show a trend of first decreasing and then increasing. Specifically, when tempered at 300 ℃ and 400 ℃, the plasticity and toughness of the tested steel plate are at low values, and the cold bending property also deteriorates. Considering the variation laws of mechanical properties comprehensively, the appropriate tempering temperature is finally determined to be 200 ℃. The steel plates industrially trial-produced with the optimized process (880 ℃×30 min quenching plus 200 ℃×160 min tempering) exhibit excellent comprehensive properties, with yield strength of 1456 MPa, tensile strength of 1852 MPa, elongation after fracture of 10.5%, hardness of 552 HBW, and -40 ℃ impact absorbed energy of 35 J, showing good strength-toughness matching and cold bending property.

Key words: XTP550 ultra-high strength steel, tempering temperature, microstructure, properties

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