本文用TEM对低合金高速钢W3Mo2Cr4VSi在回火过程中析出的特殊碳化物以及Si对该过程的影响进行了较系统的研究。结果和分析表明:该钢产生二次硬化的主要特殊碳化物是圆盘状的MC型碳化物,厚度和直径比为0.3—0.4,MC碳化物和基体间满足Baker-Nutting关系:{010}MC//{010}_a,<001>_(MC)//<101>_a在560℃回火时,Si显著细化MC型特殊碳化物,在650℃回火时,Si促进M_6C碳化物沿马氏体的边界沉淀析出。文章探讨了MC型碳化物的形态以及Si影响MC型碳化物沉淀的机理。
The precipitation of secondary carbides in low alloyed high speed steel W3-Mo,2Cr4VSi during tempering and the influonce of Si, containing 0.2-2.3%, upon it were observed under TEM. It is shown that the disc-shaped carbide of MC-type, the ratio of thickness to diameter about 0.3-0.4, is the predominant finely dispersed secondary precipitate which is responsible for the peak hardness during tempering at 560℃. The orientation between MC carbide and matrix is found to be fulfilled the Baker-Nutting's relation: {010}_(MC)//{010}_α, <001>_(MC)//<101>_α The MC carbide is made fine during tempering at 560℃ when Si is added to steel, and the coarse M_6C carbide accelerated to precipitate along martensite boundary at 650℃. The MC morphology and the effect of Si on the precipitation of MC carbide are also discussed.
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| [3] | |
| [4] | |
| [5] | |
| [6] |
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