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硬质合金的断裂韧性测试难度大,在国际上方法各异,并在不断改进。经过三年努力,研究出火花切割单边缺口梁三点弯曲试验法、静载压缩预裂纹法、表面裂纹(或缺陷)法。三种硬质合金断裂韧性试验方法,查明了WC—Co系合金断裂韧性KIC与其成份、组织结构参数及其他力学性能之间的关系。用扫描电镜、声发射技术和能谱分析研究了硬质合金的断裂过程,发现WC—Co系合金断裂的微观原因是WC/WC型晶界开裂和WC的解理断裂并且以前者为主,WC/C。交界处是影响合金韧性的主要薄弱环节,在这些交界处偏集有Mg、Si、S杂质,提出了与实验结果相吻合的断裂模型。另外在硬质合金冲击性能研究方面也获得重大突破,已研制出YD—6型小能多冲试验机,并用此机及改装的
Carbide fracture toughness test is difficult, different ways in the world, and continuous improvement. After three years of hard work, we have developed a three-point bending test for unilateral notched beams for spark cutting, a pre-cracked static compression method, and a surface crack (or defect) method. Three kinds of cemented carbide fracture toughness test methods to determine the WC-Co alloy fracture toughness KIC and its composition, microstructure and structural parameters and other mechanical properties of the relationship between. The fracture process of the cemented carbide was studied by scanning electron microscopy, acoustic emission spectroscopy and energy spectrum analysis. It was found that the microscopic reason of the fracture of the WC-Co alloy is that the WC / WC grain boundary cracking and cleavage fracture of WC- WC / C. The junction is the main weakness that affects the toughness of the alloy. The Mg, Si and S impurities are concentrated in these junctions, and the fracture model that is consistent with the experimental results is proposed. In addition, the impact properties of cemented carbide has also been a major breakthrough has been developed YD-6 small multi-jet testing machine, and use this machine and modified