基于有限元模拟的无缝钢管穿孔顶头失效分析及激光表面复合处理

doi:10.13251/j.issn.0254-6051.2024.09.048

金属热处理 ›› 2024, Vol. 49 ›› Issue (9): 284-289.DOI: 10.13251/j.issn.0254-6051.2024.09.048

基于有限元模拟的无缝钢管穿孔顶头失效分析及激光表面复合处理

母舰¹, 吴和保^1,2, 张讯², 李小龙¹, 何寅², 李建军^2,3

1.武汉工程大学机电工程学院, 湖北武汉 430205;
2.湖北黄石科创模具技术研究院, 湖北黄石 435000;
3.华中科技大学材料科学与工程学院, 湖北武汉 430074

收稿日期:2024-03-02 修回日期:2024-07-13 出版日期:2024-09-25 发布日期:2024-10-29
通讯作者: 吴和保,教授,博士,E-mail: wu_hust@163.com
作者简介:母舰(1999—),男,硕士研究生,主要研究方向为激光熔覆和模具表面改性,E-mail: 1244610316@qq.com。
基金资助:
湖北省产业技术研究院项目(2021BED001);武汉工程大学研究生教育创新基金(CX2022100)

Failure analysis and laser surface composite treatment of piercing plug for seamless steel pipe based on FEM simulation

Mu Jian¹, Wu Hebao^1,2, Zhang Xun², Li Xiaolong¹, He Yin², Li Jianjun^2,3

1. School of Mechanical and Electrical Engineering, Wuhan Institute of Technology, Wuhan Hubei 430205, China;
2. Huangshi Kechuang Mould Institute of Technology, Huangshi Hebei 435000, China;
3. School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan Hubei 430074, China

Received:2024-03-02 Revised:2024-07-13 Online:2024-09-25 Published:2024-10-29

摘要/Abstract

摘要： 采用有限元模拟方法对穿孔顶头进行了温度场、应力场和热-力耦合场分析,确定了顶头穿孔过程中的最大热应力、最大耦合应力、表面最高温度、应力集中区域和疲劳裂纹类型,并对20Cr2Ni4钢进行激光熔覆+高温慢氧化复合处理,以提高顶头的力学性能和抗高温性能。有限元模拟结果表明,顶头的热-力耦合应力为热拉应力与机械压应力的矢量和,耦合应力比热应力峰值回落约5.7%。耦合应力的大小主要受热应力影响,变化趋势和分布则主要受机械应力的影响,顶头失效起源于热疲劳和机械疲劳共同作用下的内表面裂纹源,并沿径向向外表面扩展形成疲劳裂纹。激光表面复合处理结果表明,20Cr2Ni4钢经激光熔覆+高温慢氧化处理后,表面硬度可达494 HV0.025,表面强化层与基体结合牢固,并且氧元素在基体中的含量更少,分布更均匀,可有效提高顶头的使用周期。

关键词: 穿孔顶头, 失效分析, 热-力耦合, 有限元模拟, 表面复合处理, 激光熔覆

Abstract: Finite element method (FEM) was used to analyze the temperature field, stress field, and thermo-mechanical coupling field of the piercing plug, and the maximum thermo stress, maximum coupling stress, maximum surface temperature, stress concentration area, and fatigue crack type were determined. And laser cladding+high-temperature slow oxidation composite treatment was carried out on 20Cr2Ni4 steel to improve the mechanical properties and high-temperature resistance of the plug. The FEM simulation results show that the thermo-mechanical coupling stress of the plug is the vector sum of thermo tensile stress and mechanical compressive stress. The coupling stress is dropped by about 5.7% compared with the peak value of thermo stress. The value of thermo-mechanical coupling stress is mainly affected by thermo stress, and the changing trend and distribution are mainly affected by mechanical stress. the failure of the plug originates from the crack source on the inner surface under the combined action of thermo fatigue and mechanical fatigue, and propagates radially outward to form fatigue cracks on the surface. The results of laser surface composite treatment show that after laser cladding and high temperature slow oxidation treatment, the surface hardness of 20Cr2Ni4 steel can reach 494 HV0.025, the surface strengthening layer is firmly bonded to the matrix, and the content of oxygen element in the matrix is less and more evenly, which effectively improves the service life of the plug.

Key words: piercing plug, failure analysis, thermo-mechanical coupling, FEM simulation, surface composite treatment, laser cladding

中图分类号:

TG17

母舰, 吴和保, 张讯, 李小龙, 何寅, 李建军. 基于有限元模拟的无缝钢管穿孔顶头失效分析及激光表面复合处理[J]. 金属热处理, 2024, 49(9): 284-289.

Mu Jian, Wu Hebao, Zhang Xun, Li Xiaolong, He Yin, Li Jianjun. Failure analysis and laser surface composite treatment of piercing plug for seamless steel pipe based on FEM simulation[J]. Heat Treatment of Metals, 2024, 49(9): 284-289.

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基于有限元模拟的无缝钢管穿孔顶头失效分析及激光表面复合处理

Failure analysis and laser surface composite treatment of piercing plug for seamless steel pipe based on FEM simulation

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