| 李嫚,张弘弢,贾乾忠,刘强.影响涂层硬质合金刀具切削性能微观因素研究[J].,2011,(2):194-199 |
| 影响涂层硬质合金刀具切削性能微观因素研究 |
| Investigation on influences of microcosmic factors on cutting performance of coated cemented carbide tools |
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| DOI：10.7511/dllgxb201102007 |
| 中文关键词: MT-CVD涂层 奥氏体不锈钢 切削力 磨损 |
| 英文关键词: MT-CVD coat austenitic stainless steel cutting force wear |
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| 摘要点击次数: 1243 |
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| 中文摘要: |
| 通过切削奥氏体不锈钢1Cr18Ni9Ti的试验,借助扫描电镜、电子探针仪观察了两种涂层硬质合金刀具磨损形态、断口形貌,对磨损微区、刀具断口进行了能谱及成分分析．试验及分析结果表明:采用相同切削参数时,GC2025刀具的切削力比YBC251刀具小；GC2025刀具寿命显著高于YBC251刀具；YBC251刀具的磨损、破损更显著,氧化扩散磨损比GC2025刀具严重．GC2025刀具切削性能优于YBC251刀具的微观因素主要有:与后者相比,前者基体的钝圆半径小、前角大；MT-TiCN(中温涂层)及TiN涂层厚度较薄且涂层本身及层与层之间组织紧密、孔隙度小；中间层采用了交替涂覆的多层涂层技术和表面富Co的梯度结构硬质合金基体,且刀具涂层中含有微量具有细晶作用的Si元素,可以大大提高涂层的抗氧化温度及硬度． |
| 英文摘要: |
| In the experiment, two different kinds of coated cemented carbide tools were used to cut austenitic stainless steel 1Cr18Ni9Ti; tool wear modalities and fracture surfaces were observed by means of SEM and EPMA; chemical composition of the abrasion area and fracture surfaces were analyzed. Using the same cutting parameters, as the results indicated, the cutting force of GC2025 is smaller than that of YBC251; the tool life of GC2025 exceeds that of the latter, of which abrasion and breakage are obvious and oxidative wear is also more serious. The microcosmic reasons why GC2025 has a better cutting performance than YBC251 can be concluded as follows: compared with YBC251, the former has a smaller tool edge radius and a larger rake angle; the former has a thinner but more compact MT- TiCN (medium-temperature coat) and TiN coat. GC2025 also adopts alternating coating technology and gradient-structure cemented carbide which contains more amount of Co element on the surface. In addition, the coat of GC2025 contains a trace amount of fine-grained strengthening Si element, which can effectively enhance its oxidation resistance temperature and hardness. |
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