Tensile performance and fracture analysis of brazed diamond wire saw
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摘要: 使用Cu-Sn-Ti预合金粉末作为过渡层材料,实现了金刚石颗粒与0Cr18Ni9不锈钢丝的钎焊连接,制作了直径约为0.8 mm的金刚石线锯。通过拉伸试验,获得了钢丝及线锯的拉伸力学性能数据,分析了钎焊前后钢丝横截面金相组织,利用扫描电子显微镜观察钢丝及线锯断口微观形貌,并分析了其拉伸断裂机理。结果表明:金刚石颗粒通过钎焊牢固连接于0Cr18Ni9不锈钢丝表面,形成耐磨工作层。线锯的抗拉强度可以保持700 MPa以上,屈服强度保持600 MPa以上,塑性大幅提高。钢丝基体奥氏体长大,组织均匀性大幅提高。经钎焊热处理的钢丝及其制备的线锯的拉伸断裂方式为韧性断裂,钎焊金刚石线锯工作层拉伸失效形式为钎料合金层断裂并从金属丝基体表面剥离。
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关键词:
- 0Cr18Ni9钢丝 /
- 钎焊 /
- 金刚石线锯 /
- 拉伸断裂
Abstract: Diamond grits are brazed on the surface of 0Cr18Ni9 stainless steel wire by using Cu-Sn-Ti pre-alloyed powder as interlayer materials,thus producing diamond wire saw with a diameter of 0.8 mm.Mechanical properties of steel wire and wire saws are obtained by tensile tests,and the crystalline structures of wire cross sections before and after brazing are analyzed.Fracture morphology of the wire is observed by using scanning electron microscope.Then the tensile fracture mechanism is analyzed.Resultsshow that diamond grits are firmly brazed on 0Cr18Ni9 stainless steel surface,forming a wearresistant layer.The tensile strength of brazed wire saws remains over 700 MPa and yield strength 600 MPa with plasticity enhanced largely.Austenite in wire matrix grows and the uniformity of the tissue increases sharply.The tensile fracture mode of heated wire is ductile,and the tensile failure mode of working layer is alloy break and strip from the matrix.-
Key words:
- 0Cr18Ni9 steel wire /
- brazing /
- diamond wire saw /
- tension fracture
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