Effect of maceration alloys on the performances of PDC drill bit matrix
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摘要: PDC钻头胎体的浸润比对其力学性能和微观形貌的影响较大,为了探究浸渍合金对胎体性能的影响规律,采用Cu-Ni-Mn-Zn和Cu-Ni-Mn-Sn 2种浸渍合金制作不同高度的工作层和非工作层试块,得出不同浸渍合金下钻头胎体工作层和非工作层的浸润比及力学性能差异,同时利用扫描电镜对试块的微观形貌和元素含量进行分析。结果表明:试块的浸润比为定值;胎体钻头工作层的浸润比小于非工作层的,微观形貌上表现为工作层中浸渍合金的岛状组织大而分散,非工作层的岛状组织小而致密;对于同种类型的试块,通常浸润比越大密度越大;采用Cu-Ni-Mn-Sn得到的试块硬度均大于Cu-Ni-Mn-Zn试块的,但其抗弯强度和冲击韧性远低于Cu-Ni-Mn-Zn试块的。Abstract: The wetting ratio of PDC drill bit matrix has a great influence on its mechanical properties and microstructure. To explore the influences of maceration alloys on the performance of PDC drill bit matrix, two kinds of maceration alloys, Cu-Ni-Mn-Zn and Cu-Ni-Mn-Sn, were used to make the working layer and the non-working layer test blocks with different heights. The differences in wetting ratio and mechanical properties between the working layer and the non-working layer of the matrix bit under different maceration alloys were obtained. At the same time, scanning electron microscopy was used to analyze the microstructure and the element content of the blocks. The results show that the wetting ratio of the test block is a constant value. The wetting ratio of the working layer of the bit matrix is smaller than that of the non-working layer. The microstructures show that the island structure of the maceration alloy in the working layer is large and dispersed, while the island structure in the non-working layer is small and dense. For the same type of test block, the higher the wetting ratio, the higher the density. The hardness of the test block obtained by Cu-Ni-Mn-Sn is higher than that of Cu-Ni-Mn-Zn, but its bending strength and impact toughness are much lower than that of Cu-Ni-Mn-Zn.
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Key words:
- PDC drill bit matrix /
- maceration alloys /
- wetting ratio /
- mechanical properties /
- microstructure
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表 1 浸渍合金的主要成分
Table 1. Main components of maceration alloys
浸渍合金 质量分数 ω1 / % Cu Ni Mn Zn Sn Cu-Ni-Mn-Zn 余量 0~5 5~10 20~25 Cu-Ni-Mn-Sn 余量 10~15 0~5 0~5 表 2 工作层试块的浸润比
Table 2. Wetting ratios of working layer blocks with different heights
试块高度 h / mm $ {m}_{粉} $/ g $ {m}_{块} $/ g 浸润比 i 55 47.488 59.138 0.25 45 36.832 46.822 0.27 40 32.126 40.910 0.27 35 29.010 36.290 0.25 表 3 不同浸渍合金试块的浸润比、密度及力学性能
Table 3. Wetting ratios, density and mechanical properties of different maceration alloy blocks
试块性能 浸渍合金 Cu-Ni-Mn-Zn Cu-Ni-Mn-Sn 工作层 非工作层 工作层 非工作层 浸润比 i 0.26 0.49 0.34 0.44 密度 ρ / (g·cm−3) 12.205 10.190 12.330 10.079 硬度 HRC 37.4 22.6 39.8 23.1 抗弯强度 σ / MPa 1 050.581 893.413 828.541 756.561 冲击韧性 KIC / (kJ·m−2) 33.76 54.72 31.02 47.42 表 4 试块的能谱分析结果
Table 4. Results of energy spectrum analysis of blocks
元素 浸渍合金 Cu-Ni-Mn-Zn Cu-Ni-Mn-Sn 工作层元素质量分数 ω2 / % 非工作层元素质量分数 ω3 / % 工作层元素质量分数 ω2 / % 非工作层元素质量分数 ω3 / % A B C D E F A B C D E F Mn 2.98 2.25 1.20 6.10 4.05 Fe 32.31 6.11 19.87 2.97 10.63 Ni 19.66 8.59 12.39 7.69 17.64 9.31 Cu 40.12 18.38 34.43 23.38 58.12 40.52 72.59 40.24 Zn 24.89 15.31 18.62 15.64 Sn 3.09 2.44 1.76 W 100.00 12.35 57.72 100.00 47.18 100.00 3.17 47.31 100.00 0.98 58.00 -
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