Study on the microstructure and properties of FeMoCoNiCrTix high-entropy alloy cladding layer on T10 steel
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摘要: 采用激光熔覆技术在T10A钢表面制备了FeMoCoNiCrTix（x分别为0.25，0.50，0.75，1.00）高熵合金熔覆层，分析了试样熔覆层及基体界面处的相结构及组织，并利用显微硬度计测试了试样处理前后的截面硬度变化。研究表明，经过激光熔覆在T10A钢表面得到的高熵合金层主要由NiCrFe、NiCrCoMo 2种固溶体为主，其结构分别为BCC结构和FCC结构，熔覆层的组织以柱状枝晶为主，界面处出现等轴晶；随着Ti含量增多，熔覆层由固溶强化变为固溶体与硬质相混合强化，熔覆层的HV硬度达到了792，热影响区的HV硬度达到了620，均高于基体硬度。同时耐磨损性能有了明显提高，磨损方式由粘着磨损逐渐变为磨粒磨损。Abstract: FeMoCoNiCrTix (x is 0.25, 0.50, 0.75, 1.00, respectively) high-entropy alloy cladding layer was prepared on the surface of T10A steel by laser cladding technology. The phase structure and microstructure of the interface between the cladding layer and the substrate were analyzed, and the cross-sectional hardness of the sample before and after the treatment were tested respectively by the microhardness tester. The results showed that the high-entropy alloy cladding layer obtained on the surface of T10A steel by laser cladding technology was mainly composed of NiCrFe and NiCrCoMo, two solid solutions whose structures were BCC and FCC, respectively. The microstructure of the cladding layer mainly comprises columnar dendrites, and equiaxed crystals appeared at the interface; As the Ti content increased, the strengthening effect of the cladding layer changed from solid solution strengthening to solid solution and hard phase mixed strengthening. The HV hardness of the cladding layer and the heat affected zone reached 792 and 620, both higher than that of the substrate. At the same time, the wear resistance of the alloy cladding layer witnessed a significant increase and its wear mode gradually changed from adhesive wear to abrasive wear.
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Keywords:
- laser cladding /
- Ti content /
- high-entropy alloy cladding layer /
- microhardness /
- wear resistance
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配置好的环烷酸，皂化后并不是简单的真溶液，而是水分散在油相中的微乳状液体系，萃取稀土时，上述液体系会使微乳状液破乳。通过串级萃取理论计算得出的有机相理论流量不夹带水份，实际生产中皂化好的环烷酸往往又夹带水份，因此，为达到正常的萃取分离效果，保证产品质量，需要对有坑相理论流量进行校正，即先估算一个百分数，但不可避免地使理论值与实际值有时出现偏差。
一 公式推导
今设：
Vs实 进槽有机相实际流量 1/min
Vs理 计算的有机相理论流量
ε 有机相皂化度
C 皂化有机相氨水浓度(N)
V1 未皂化的有机相体积(1)
V2 将V1皂化为皂化度ε的氨水体积
则：
(1) 
(2) 将式(2)代入式(1)得
(3) 令
(4) 
(5) 二 讨 论
1.系数k与有机相皂化度成正比，皂化度越大K值越大，反之亦然。K和皂化有机相的氨水浓度成反比。
2.公式(4)和(5)，适周于氨水皂化有机相时，水均匀分布于有机相中的任何体系。它的导出，为确定▽s实提供理论依据，为准确地计算整个槽体平衡提供可靠依据。
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图 2 FeMoCoNiCrTi熔覆层试样（4#）各部分的显微组织
Fig 2. Microstructure of FeMoCoNiCrTi cladding layer sample (4#)
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图 3 FeMoCoNiCrTi熔覆层试样（4#）中析出物（A点）的EDS图谱
Fig 3. EDS measurement pattern of precipitates (point A) in the FeMoCoNiCrTi cladding layer sample (4#)
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图 4 1#, 2#, 3#, 4#试样截面的显微硬度分布曲线
Fig 4. 1#, 2#, 3#, 4# samples section microhardness distribution curves
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图 5 T10钢基体与FeMoCoNiCrTix试样的磨损实验结果
Fig 5. T10 steel substrate and FeMoCoNiCrTix wear test results
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图 6 FeMoCoNiCrTix试样的磨损实验显微照片
Fig 6. Wear micrographs of FeMoCoNiCrTix cladding samples
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