Cr含量对铝青铜熔覆涂层组织及性能的影响  

Effect of Cr Contents on Microstructure and Properties of Aluminum Bronze Cladding Layer

作　　者：张富强 龙飞 浦娟 石晓辉 许祥平[4] ZHANG Fuqiang;LONG Fei;PU Juan;SHI Xiaohui;XU Xiangping(Xinxiang Qixing Brazing Technology Co.,Ltd.,Henan Xinxiang 453010,China;Institute of Materials,Henan Academy of Sciences,Zhengzhou 450052,China;School of Intelligent Manufacturing and Control Engineering,Shanghai Polytechnic University,Shanghai 212009,China;School of Materials Science and Engineering,Jiangsu University of Science and Technology,Jiangsu Zhenjiang 212003,China)

机构地区：[1]新乡市七星钎焊科技有限公司,河南新乡453010 [2]河南省科学院材料研究所,郑州450052 [3]上海第二工业大学智能制造与控制工程学院,上海212009 [4]江苏科技大学材料科学与工程学院,江苏镇江212003

出　　处：《精密成形工程》2025年第3期58-66,共9页Journal of Netshape Forming Engineering

基　　金：河南省科学院高层次人才科研启动项目(241820062)。

摘　　要：目的采用成分设计和熔炼连铸等工艺研制出不同Cr含量的铝青铜焊丝,探究了Cr含量对铝青铜熔覆层微观组织、力学性能以及耐磨性能的影响规律。方法采用研制的铝青铜焊丝在27SiMn钢上进行堆焊试验,通过蔡司倒置金相显微镜、扫描电子显微镜、万能力学试验机等设备对铝青铜熔覆层的微观组织、力学性能和耐磨性能进行测试分析。结果添加Cr元素后,熔覆层的微观组织得到明显细化,浅白色α相尺寸减小、数量减少,并由块状转为针尖状。深色β′相和颗粒状κ相数量逐渐增加。随着Cr含量的增加,熔覆涂层的显微硬度和抗拉强度都逐渐增加。当Cr含量(质量分数)为0.3%时,熔覆涂层的硬度达到最大值,熔覆涂层的抗拉强度达到最大值652 MPa,延伸率为18.6%。相比于未添加Cr元素的熔覆层,含Cr元素的熔覆层平均摩擦因数逐渐降低,耐磨性能得到提高。结论Cr元素能够细化铝青铜熔覆层的微观组织,提高熔覆层的综合性能。添加适当的Cr元素能够显著提高铝青铜熔覆层的显微硬度、抗拉强度和耐磨性能。The work aims to develop aluminum bronze welding wires with different Cr contents through the adoption of compositional design and processes such as melting and continuous casting,so as to investigate the effect of Cr contents on the microstructure,mechanical properties,and wear resistance of aluminum bronze cladding layers.Using the developed aluminum bronze welding wires,surfacing experiments were conducted on 27SiMn steel.The microstructure,mechanical properties,and wear resistance of the cladding layer were analyzed with equipment such as a Zeiss inverted metallographic microscope,scan-ning electron microscope,and universal mechanical testing machine.The addition of Cr significantly refined the microstructure of the cladding layer,the size and number of pale whiteαphases were reduced,and the shape was changed from block to needle tip.The amount of darkβ′phases and granularκphases gradually increased.As the Cr content increased,the microhardness and the tensile strength of the cladding layer gradually increased.When the Cr content was 0.3wt.%,the microhardness of the clad-ding layer reached the maximum value,and the tensile strength of the cladding layer reached the maximum value of 652 MPa,with an elongation of 18.6%.Compared with the cladding layer without Cr elements,the average friction coefficient of the clad-ding layer containing Cr elements decreased gradually,and the wear resistance was improved.Therefore,the addition of Cr ele-ments refines the microstructure of the aluminum bronze cladding layer and enhances its overall performance.The appropriate addition of Cr elements significantly improves the microhardness,tensile strength,and wear resistance of the aluminum bronze cladding layer.

关 键 词：CR元素 铝青铜焊丝 显微组织 力学性能 耐磨性能 

分 类 号：TG441[金属学及工艺—焊接]