Nb对EA4T钢表面激光熔覆Fe基涂层组织与性能的影响
Effect of Nb on Microstructure and Properties of Laser Cladding Fe-based Coating on EA4T Steel Surface
- 2025年55卷第1期 页码:1-8
收稿:2024-04-17,
修回:2024-07-26,
纸质出版:2025-01-20
DOI: 10.7512/j.issn.1001-2303.2025.01.01
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收稿:2024-04-17,
修回:2024-07-26,
纸质出版:2025-01-20
移动端阅览
通过在EA4T钢表面激光熔覆Fe-Cr-Ni-Nb粉末,研究不同Nb含量对熔覆层的微观组织和力学性能的影响规律。利用光学显微镜(OM)和扫描电子显微镜(SEM)分析熔覆层的组织形貌,采用显微硬度计和冲击试验测试熔覆层的硬度及冲击韧性。结果表明:在不同Nb含量的熔覆层中,主要由奥氏体、FeNi固溶体和(Cr、Fe)
7
C
3
组成;随Nb含量的增加,熔覆层的晶粒尺寸呈现细化现象。但与不含Nb的熔覆层相比,当添加Nb元素后,熔覆层的拉伸强度和屈服强度均得到显著提高,0.3%Nb、0.6%Nb和0.9%Nb熔覆层试样的平均拉伸强度分别提高了42.5%、37.7%、13.1%,平均屈服强度分别提高了26.5%、18.9%、14.1%,均明显高于基体。此外,熔覆层的冲击韧性也随着Nb含量的增加而得到提高,与未添加Nb的熔覆试样相比,平均冲击功分别增加8.3%、9.4%、26.4%。综合来看,Nb含量为0.9%的熔覆层综合力学性能最好。
In this paper
the effects of different Nb contents on the microstructure and mechanical properties of the cladding layer were studied by laser cladding Fe-Cr-Ni-Nb powder on the surface of EA4T axle steel. The microstructure of the cladding layer was analyzed by optical microscope (OM) and scanning electron microscope (SEM). The hardness and impact toughness of the cladding layer were tested by microhardness tester and impact test. The results show that the cladding layer with different Nb content is mainly composed of austenite
FeNi solid solution and (Cr
Fe)
7
C
3
. With the increase of Nb content
the grain size of the cladding layer is refined. However
compared with the cladding layer without Nb
when the Nb element is added
the tensile strength and yield strength of
the cladding layer are significantly improved. The average tensile strength increases by 42.5%
37.7% and 13.1%
respectively
and the average yield strength increases by 26.5%
18.9% and 14.1%
respectively. In addition
the impact toughness of the cladding layer is also improved with the increase of Nb content. Compared with the cladding sample without Nb
the average impact energy is increased by 8.3%
9.4% and 26.4%
respectively. On the whole
the cladding layer with Nb content of 0.9% has the best comprehensive mechanical properties.
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