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应用分析电子显微术对粉末冶金高速钢的精细结构进行了研究。 Speed法萃取复型衍衬象研究结果表明,PT15和Rex25粉末冶金高速钢中二次析出碳化物的生长满足由扩散控制的生长动力学方程 PT15和Rex25钢中的二次析出碳化物与基体的取向关系与文献报道的取向关系相符。合金碳化物晶格常数的变化未导致新的取向关系。 MMD方法对Rex25钢的研究结果表明存在MC和M_2C伴生形核现象。MC碳化物择优在碳原子有序化的{100}_α面上形核。 应用会聚束电子衍射术对MC碳化物的点阵常数进行了测量。结果为a=4.2245 。高合金化没有导致MC自身结构和对称性的变化。
The fine structure of powder metallurgy high speed steel was studied by using analytical electron microscopy. The results of the method of Speed extraction of complex type diffraction showed that the growth of secondary precipitation carbides in PT15 and Rex25 powder metallurgy high-speed steel satisfied the growth kinetics of diffusion-controlled growth kinetics equation PT15 and Rex25 secondary precipitated carbide and matrix The orientation relationship is consistent with the reported orientation. The variation of the lattice constant of the alloy carbides did not lead to a new orientation relationship. The results of the MMD method on Rex25 steel indicate the presence of MC and M_2C associated nucleation. MC carbides preferentially nucleate on the {100} _α surface where carbon atoms are ordered. The lattice constants of MC carbide were measured by convergent beam electron diffraction. The result is a = 4.2245. High alloying did not lead to changes in the structure and symmetry of MC itself.