Microstructure and Properties of Laser Cladding SiC Reinforced Ni35 Alloy Layer
摘 要
在45钢表面、不同激光功率(1 000~1 400 W)和扫描速度(6~10 mm·s-1)下激光熔覆质量分数20% SiC增强Ni35合金熔覆层,根据熔覆层宏观形貌确定最佳工艺参数,研究了最佳参数下熔覆层的组织和性能。结果表明:该激光熔覆层的最佳工艺参数为激光功率1 000 W、扫描速度8 mm·s-1,该参数下熔覆层的组织为树枝晶和等轴晶,物相包括SiC、Ni4B3、CrB、Ni2Si和FeSi等硬质相;熔覆层的硬度约为45钢基体的3.5倍,在熔覆过程中激光淬火作用下热影响区的硬度高于基体的;熔覆层的磨损质量损失均明显小于基体的,且磨损质量损失随磨损时间延长的增幅较小,说明熔覆层耐磨性能较好;熔覆层磨损60 min时的磨损方式主要为黏着磨损,磨损120 min时为磨粒磨损。
Abstract
20wt% SiC reinforced Ni35 alloy cladding layer was prepared on 45 steel surface by laser cladding at different laser power (1 000-1 400W) and scanning speeds (6-10 mm·s-1). The optimal process parameters were determined according to the macromorpholgy of the cladding layer. The microstructure and properties of the cladding layer were studied under the optimal parameters. The results show that the optimal process parameters of the laser cladding layer were as follows: laser power of 1 000 W and scanning speed of 8 mm·s-1. Under these parameters, the microstructure of the cladding layer consisted of dendrites and equiaxed crystals, and the phases included hard phases such as SiC, Ni4B3, CrB, Ni2Si and FeSi. The hardness of the cladding layer was about 3.5 times that of the 45 steel substrate, and the hardness of the heat affected zone was higher than that of the substrate because of laser quenching effect during cladding. The wear mass loss of the cladding layer was obviously less than that of the substrate, and the increase in wear mass loss with the prolonged wear time was small, indicating that the wear resistance of the cladding layer was relatively good. The main wear mode of the cladding layer was adhesive wear after wear for 60 min, and was abrasive wear after wear for 120 min.
中图分类号 TG154 DOI 10.11973/jxgccl202109011
所属栏目 材料性能及应用
基金项目
收稿日期 2020/8/21
修改稿日期 2021/7/20
网络出版日期
作者单位点击查看
备注柴程(1995-),男,甘肃平凉人,硕士研究生
引用该论文: CHAI Cheng,LI Xinmei,WANG Songchen,WANG Gen. Microstructure and Properties of Laser Cladding SiC Reinforced Ni35 Alloy Layer[J]. Materials for mechancial engineering, 2021, 45(9): 58~61
柴程,李新梅,王松臣,王根. SiC增强Ni35合金激光熔覆层的组织和性能[J]. 机械工程材料, 2021, 45(9): 58~61
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【7】张维平, 郎志华, 马海波.激光熔覆SiC/Co复合涂层的组织与性能研究[J].表面技术, 2011, 40(1):8-10. ZHANG W P, LANG Z H, MA H B.Microstructure and performance of laser cladding SiC/Co coating[J].Surface Technology, 2011, 40(1):8-10.
【8】谭金花, 孙荣禄, 牛伟, 等.Ni60/h-BN含量对激光熔覆钛基复合涂层组织及性能的影响[J].表面技术, 2019, 48(10):107-115. TAN J H, SUN R L, NIU W, et al.Effect of Ni60/h-BN content on microstructures and properties of laser cladding titanium-based composite coatings[J].Surface Technology, 2019, 48(10):107-115.
【9】马世榜, 苏彬彬, 王旭, 等.基于激光熔覆SiC/Ni复合涂层的耐磨性[J].材料工程, 2016, 44(1):77-82. MA S B, SU B B, WANG X, et al.Wear resistance of SiC/Ni composite coating based on laser cladding[J].Journal of Materials Engineering, 2016, 44(1):77-82.
【10】LU X L, LIU X B, YU P C, et al.Effects of annealing on laser clad Ti2SC/CrS self-lubricating anti-wear composite coatings on Ti6Al4V alloy:Microstructure and tribology[J].Tribology International, 2016, 101:356-363.
【11】丁紫正, 潘成刚, 常庆明, 等.激光熔覆SiCp/Ni35覆层组织与磨损性能研究[J].特种铸造及有色合金, 2017, 37(8):886-890. DING Z Z, PAN C G, CHANG Q M, et al.Microstructure and wear properties of SiCp/Ni35 coatings by laser cladding[J].Special Casting & Nonferrous Alloys, 2017, 37(8):886-890.
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