激光能量密度对CrFeCoNiNb熔覆层组织演变和性能影响的试验研究

doi:10.3901/JME.2023.02.127

摘要/Abstract

摘要： 采用预置粉末法在42CrMo基体表面制备CrFeCoNiNb高熵合金激光熔覆层，探索激光能量密度对CrFeCoNiNb熔覆层组织和性能的影响规律。对于预置粉末激光熔覆工艺，激光功率、扫描速度、光斑直径作为工艺参数三要素，不是独立影响熔覆层质量与性能，且激光功率对熔覆层质量与性能的影响最大。通过改变激光功率进而改变作用于熔覆层的激光能量密度，研究激光能量密度对CrFeCoNiNb高熵合金熔覆层硬度、耐磨性和耐腐蚀性的影响规律。试验结果表明：熔覆层主相为面心立方结构相（FCC相）和密排六方结构相（Laves相）。随着激光能量密度的增加，其衍射峰面积先减少后增加，熔覆层晶粒先细化后粗化，转折点处的激光能量密度都为116.7 J/mm²。而且，此时熔覆层物相分布更均匀，磨损形貌主要为光滑的犁沟，相应的减摩效果好，磨损率有所降低。主相含量的改变和晶粒尺寸的改变分别是影响熔覆层平均显微硬度和耐腐蚀性的主要因素。Laves硬质相的增加有利于熔覆层硬度的提高，细化的晶粒可以形成致密的钝化膜，有利于提高熔覆层耐腐蚀性。

关键词: 激光能量密度, 高熵合金, 显微组织, 力学性能, 耐腐蚀性

Abstract: CrFeCoNiNb high entropy alloy laser cladding layer was prepared on the surface of 42CrMo substrate by powder preseting method, and the effect of laser energy density on the microstructure and properties of CrFeCoNiNb cladding layer was investigated.For the preset powder type, the influence of laser power on the quality of cladding layer is the largest and most intuitive among the three factors of process parameters. For the type of powder preseting method, laser power, scanning speed and spot diameter are three factors of process parameters, which do not independently affect the quality and performance of the cladding layer, and laser power has the greatest influence on the quality and performance of the cladding layer. By changing the laser power and then changing the laser energy density acting on the cladding layer, the influence of the laser energy density on the hardness, wear resistance and corrosion resistance of the high entropy CrFeCoNiNb alloy cladding layer was studied. The experimental results show that with the increase of energy density, the main phase content of the body-centered cubic(BCC) decreases at first and then increases, and the grain of the cladding layer is refined at first and then coarsely. The energy density at the turning point is 116.7 J/mm². Moreover, at the point, the phase distribution of the cladding layer is more uniform, and the wear morphology is mainly smooth furrow. The corresponding friction reduction effect is good, and the wear rate is reduced to a certain extent. The change of the content of main phase and the change of grain size correspond to the main factors which affect the average microhardness and corrosion resistance of cladding layer respectively. The increase of BCC phase is beneficial to the improvement of the hardness of the cladding layer, and the refined grain can form a dense passivation film, which is beneficial to the improvement of the corrosion resistance of the cladding layer.

Key words: energy density, high entropy alloys, microstructure, mechanical properties, corrosion resistant

中图分类号:

TG133

宋鹏芳, 姜芙林, 王玉玲, 杨发展, 王冉. 激光能量密度对CrFeCoNiNb熔覆层组织演变和性能影响的试验研究[J]. 机械工程学报, 2023, 59(2): 127-137.

SONG Pengfang, JIANG Fulin, WANG Yuling, YANG Fazhan, WANG Ran. Experimental Study on the Effect of Energy Density on Microstructure Evolution and Properties of CrFeCoNiNb Cladding Layer[J]. Journal of Mechanical Engineering, 2023, 59(2): 127-137.

参考文献

[1] YEH Junwei. Alloy design strategies and future trends in high-entropy alloys[J]. J. Miner. Met. Mater. Soc., 2013, 65(12):1759-1771.
[2] NENE S S, FRANK M, LIU K, et al. Corrosion-resistant high entropy alloy with high strength and ductility[J]. Scripta Materialia, 2020, 166:168-172.
[3] DING Qingqing, ZHANG Yin, CHEN Xiao, et al. Tuning element distribution, structure and properties by composition in high-entropy alloys[J]. Nature, 2019, 574(7777):223-227.
[4] HE Feng, WANG Zhijun, ZHU Man, et al. Stability of lamellar structures in CoCrFeNiNbx eutectic high entropy alloys at elevated temperatures[J]. Materials & Design, 2016, 104:10-25.
[5] GLUDOVATZ B, HOHENWARTER A, Catoor D, et al. A fracture-resistant high entropy alloy for cryogenic applications[J]. Science, 2014, 345:1153-1158.
[6] CHATURVEDI M C, CHUNG D W. Yielding behavior of aγy-precipitation strengthened Co Ni Cr Nb Fe alloy[J]. Metallurgical Transactions A, 1981, 12(1):77-81.
[7] ZHANG Mengdi, ZHANG Lijun, LIAW P, et al. Effect of Nb content on thermal stability, mechanical and corrosion behaviors of hypoeutectic CoCrFeNiNbx high-entropy alloys[J]. Journal of Materials Research, 2018, 33(19):3276-3286.
[8] WANG Wenrui, QI Wu, XIE Lu, et al. Microstructure and corrosion behavior of (CoCrFeNi)95Nb5 high-entropy alloy coating fabricated by plasma spraying[J]. Materials, 2019, 12(5):694.
[9] TSAU C H, YEH C Y, TSAI M C. The effect of Nb-content on the microstructures and corrosion properties of CrFeCoNiNbx high-entropy alloys[J]. Materials, 2019, 12(22):3716.
[10] 沈毅鸿, 张元良, 李涛, 等. 激光熔覆中工艺参数对形成层几何特征及硬度影响分析[J]. 大连理工大学学报, 2017, 57(3):247-251. SHEN Yihong, ZHANG Yuanliang, LI Tao, et al. Analysis of influence of process parameters on geometry and hardness of cambium in laser cladding[J]. Journal of Dalian University of Technology, 2017, 57(3):247-251.
[11] 徐淑文, 陈希章, 苏传出, 等. 工艺参数对激光熔覆层质量的影响[J]. 热加工工艺, 2020, 49(22):110-113. XU Shuwen, CHEN Xizhang, SU Chuanchu, et al. Influence of process parameters on quality of laser cladding layer[J]. Hot Working Technology, 2020, 49(22):110-113.
[12] BISWAS K, YEH J W, Bhattacharjee P P, et al. High entropy alloys:Key issues under passionate debate[J]. Scripta Materialia, 2020, 188:54-58.
[13] NI Cong, SHI Yan, LIU Jia, et al. Characterization of Al0.5FeCu0.7NiCoCr high-entropy alloy coating on aluminum alloy by laser cladding[J]. Optics & Laser Technology, 2018, 105:257-263.
[14] JUAN Yongfei, LI Jun, JIANG Yiqing, et al. Modified criterions for phase prediction in the multi-component laser-clad coatings and investigations into microstructural evolution/wear resistance of FeCrCoNiAlMox laser-clad coatings[J]. Applied Surface Science, 2018, 465(28):700-714.
[15] ZHANG Yong, ZHOU Yunjun, LIN Junpin, et al. Solid-solution phase formation rules for multi-component alloys[J]. Advanced Engineering Materials, 2008, 10(6):534-538.
[16] GU Zhen, XI Shengqi, SUN Chongfeng. Microstructure and properties of laser cladding and CoCr2.5FeNi2Tix high-entropy alloy composite coatings[J]. Journal of Alloys and Compounds, 2019, 819:152986.
[17] LIU P C, WANG Z X, CONG J H, et al. The significance of Nb interface segregation in governing pearlitic refinement in high carbon steels[J]. Materials Letters, 2020, 279:128520.
[18] 彭振, 杜文栋, 刘宁, 等. 激光熔覆FeCoCrCuNiMoVSiB高熵合金熔覆层的制备和性能研究[J]. 江苏科技大学学报, 2017(1):35-39. PENG Zhen, DU Wendong, LIU Ning, et al. Properties of the FeCoCrCuNiMoVSiB high entropy alloy coating prepared by laser cladding[J]. Journal of Jiangsu University of Science and Technology, 2017(1):35-39.
[19] XU Lifen, Wang Dongsheng. Grain growth characteristics of plasma-sprayed nanostructured Al2O3-13wt%TiO2 coatings during laser remelting[J]. Ceramics International, 2021:1-7.
[20] 许明三, 李剑峰, 李驊登, 等. 激光熔覆粉料和工艺参数对45钢基体与熔覆层结合强度的影响研究[J]. 机械工程学报, 2017, 53(9):209-216. XU Mingsan, LI Jianfeng, LI Huadeng, et al. Influence on powders and process parameters on bonding shear strength in laser cladding[J]. Journal of Mechanical Engineering, 2017, 53(9):209-216.
[21] 付立铭, 单爱党, 王巍. 低碳Nb微合金钢中Nb溶质拖曳和析出相NbC钉扎对再结晶晶粒长大的影响[J].金属学报, 2010, 46(7):832-837. FU Liming, SHAN Aidang, WANG Wei. Effect of Nb solute dragging and precipitated phase Nb napping on recrystallized grain growth in low carbon Nb microalloyed steels[J]. Acta Metallurgica Sinica, 2010, 46(7):832-837.
[22] WANG H H, WANG J, TONG Z, et al. Characterization of Nb interface segregation during welding thermal cycle in microalloyed steel by atom probe tomography[J]. Metallurgical and Materials Transactions A, 2018, 49:6224-6230.
[23] DONG Wang, ZHAO Haixing, HUANG Wang, et al. Failure mechanism of a stellite coating on heat-resistant steel[J]. Metallurgical & Materials Transactions A, 2017, 48(9):1-9.
[24] 陈卫祥, 甘海洋, 涂江平, 等. Ni-P-纳米碳管化学复合镀层的摩擦磨损特性[J]. 摩擦学学报, 2002, 22(4):241-244. CHEN Weixiang, GAN Haiyang, TU Jiangping, et al. Friction and wear behavior of Ni-P-Carbon nanotubes electroless composite coating[J]. Tribology, 2002, 22(4):241-244.
[25] ARCHARD J F. Contact and rubbing of flat surfaces[J]. Journal of Applied Physics, 1953, 24(8):981-989.
[26] MAZAHERI Y, JALILVAND M M, HEIDARPOUR A, et al. Tribological behavior of AZ31/ZrO2 surface nanocomposites developed by friction stir processing[J]. Tribology International, 2019, 143:106062.
[27] LI Yuxin, SU Keqiang, BAI Peikang, et al. Microstructure and property characterization of Ti/TiBCN reinforced Ti based composite coatings fabricated by laser cladding with different scanning speed[J]. Materials Characterization, 2020, 159:110023.
[28] TAYLOR C D, LU P, SAAL J, et al. Integrated computational materials engineering of corrosion resistant alloys[J]. npj Materials Degradation, 2018, 2(1):6.