金属热处理 ›› 2026, Vol. 51 ›› Issue (2): 233-237.DOI: 10.13251/j.issn.0254-6051.2026.02.034

• 工艺研究 • 上一篇    下一篇

渗碳体球化对S355NL钢力学性能的影响

吴鹏哲, 李振江, 齐会萍   

  1. 太原科技大学 材料科学与工程学院 金属材料成型理论与技术山西省重点实验室, 山西 太原 030024
  • 收稿日期:2025-09-17 修回日期:2025-12-08 发布日期:2026-03-05
  • 通讯作者: 李振江,教授,博士,E-mail:lizj@tyust.edu.cn
  • 作者简介:吴鹏哲(1996—),男,硕士研究生,主要研究方向为材料成型先进制造技术与设备,E-mail:1065169645@qq.com。
  • 基金资助:
    山西省基础研究计划(202203021211207);山西省科技创新人才团队专项(202204051001002)

Effect of cementite spheroidization on mechanical properties of S355NL steel

Wu Pengzhe, Li Zhenjiang, Qi Huiping   

  1. Shanxi Key Laboratory of Metal Forming Theory and Technology, School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan Shanxi 030024, China
  • Received:2025-09-17 Revised:2025-12-08 Published:2026-03-05

摘要: 对铁素体-珠光体钢S355NL在660 ℃保温不同时间(0.5、1、5、10 h),并对其组织、强度和冲击性能进行了观察和测试,研究渗碳体球化对S355NL钢力学性能的影响。结果表明,随着保温时间的延长,珠光体(P)中的渗碳体片层逐渐发生球化,屈服强度、抗拉强度和低温冲击性能急剧下降。强度的下降是由于渗碳体球化后对位错的阻碍作用减弱,而低温冲击性能降低则是由球化后的渗碳体颗粒对裂纹的扩展阻碍作用降低导致。

关键词: S355NL钢, 渗碳体球化, 强度, 低温冲击性能

Abstract: Ferrite-pearlite steel S355NL was held at 660 ℃ for different time (0.5, 1, 5, 10 h), then the effect of cementite spheroidization on mechanical properties of the steel was investigated by observing and testing its microstructure, strength, and impact property. The results indicate that as the holding time increases, the lamellar cementites within pearlite (P) gradually undergo spheroidization, the yield strength, tensile strength, and low-temperature impact property decline sharply. The strength reduction stems from diminished dislocation obstruction after cementite spheroidization. The decrease in low-temperature impact property arises from reduced crack propagation resistance by spheroidized cementite particles.

Key words: S355NL steel, cementite spheroidization, strength, low-temperature impact property

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