摘要
本工作借助激光熔覆技术,在45钢上开展不同Cr_(3)C_(2)添加量的Ni_(3)Al+Cr_(3)C_(2)混合粉末制备Ni_(3)Al基合金激光熔覆层试验研究,利用扫描电镜、X射线衍射仪、透射电镜及摩擦磨损试验机等设备,统计不同Cr_(3)C_(2)添加量下原位自生碳化物的含量及尺寸,分析碳化物对Ni_(3)Al基合金熔覆层显微组织、显微硬度及摩擦磨损性能的影响。结果表明:Ni_(3)Al基合金激光熔覆层组织主要为Ni_(3)Al基相和原位自生的Cr_(7)C_(3)碳化物。随着Cr_(3)C_(2)含量的增加,熔覆层原位自生碳化物含量由6.8%增加至32.3%,平均尺寸由0.10μm增长至0.78μm,熔覆层显微硬度(HV)由4615.8 MPa提高至5968.2 MPa。当Cr_(3)C_(2)含量为35%时,碳化物呈小颗粒弥散分布,摩擦磨损过程中产生均匀磨损,使熔覆层磨损量低至0.19 mg,此时对磨盘的磨损量相对最低,约为1.23 mg;而当Cr_(3)C_(2)含量为45%时,碳化物含量虽然达到32.3%,但多以大尺寸颗粒为主,在摩擦磨损过程中大颗粒碳化物发生断裂剥落,加速了对磨盘的磨损。
Using Ni_(3)Al+Cr_(3)C_(2)mixed powder with different Cr_(3)C_(2)contents as raw materials,Ni_(3)Al-based alloy laser cladding layer was prepared on 45 steel by laser cladding technique.The content and average size of in-situ-formed carbides with different Cr_(3)C_(2)contents were calculated by scanning electron microscopy(SEM),X-ray diffraction(XRD),transmission electron microscopy(TEM),and friction and wear testing machine,and the effects of carbides on the microstructure,microhardness and wear resistance of Ni_(3)Al-based alloy cladding layer were analyzed.The results indicate that the microstructure of the Ni_(3)Al-based alloy laser cladding layer contains mainly Ni_(3)Al matrix and in-situ-formed Cr_(7)C_(3)carbides.With the increase in Cr_(3)C_(2)content,the proportion of in-situ-formed carbides in cladding layer is increased from 6.8%to 32.3%,the average size is increased from 0.10μm to 0.78μm,and the microhardness(HV)of the cladding layer is increased from 4615.8 MPa to 5968.2 MPa.When the content of Cr_(3)C_(2)is 35%,the carbides are dispersed as small particles,and uniform wear occurs in the process of friction and wear test,so the wear loss of cladding layer is as low as 0.19 mg,and the wear loss of the disk is relatively the lowest,about 1.23 mg.However,when the content of Cr_(3)C_(2)is 45%,the carbide content reaches 32.3%,and the carbides are mainly large size particles.In the process of friction and wear test,the large carbides particles break off,which accelerates the wear of the grinding disk.
作者
阚成玲
彭云
龚侠
李长海
赵琳
田志凌
Kan Chengling;Peng Yun;Gong Karin;Li Changhai;Zhao Lin;Tian Zhiling(Welding Institute,Central Iron and Steel Research Institute,Beijing 100081,China;Chalmers University of Technology,Goteborg SE-41296,Sweden)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2024年第10期2852-2859,共8页
Rare Metal Materials and Engineering
基金
国家重点研发计划(2020YFE0200900)
钢铁研究总院自主投入研发专项(事23H60440ZD)。
