油淬温度对YG11C和YG20C硬质合金组织及性能的影响

发布时间：2018-04-28 09:23

本文选题：硬质合金 + 油淬处理　；参考：《硬质合金》2016年05期

【摘要】：本文研究了油淬温度对YG11C和YG20C硬质合金组织及性能的影响。将两种合金在1 000~1 250℃下进行油淬热处理,并于500℃回火,分析了油淬后合金的性能、Co相结构和成分、微观结构和WC晶粒三维形貌。研究结果表明:油淬热处理对YG11C和YG20C合金的密度、硬度和矫顽磁力影响较小,合金的钴磁随油淬温度的升高逐渐降低;油淬热处理不会改变WC的平均晶粒尺寸,但是WC晶粒的三维形貌随油淬温度的升高更加圆钝;随油淬温度的升高,合金中的ε-Co(hcp)含量不断降低,α-Co(fcc)含量不断增加,α-Co(fcc)的峰位也不断偏移,固溶在Co相中的W含量不断增加,Co原子的晶格常数也不断增加;油淬热处理效果与合金的Co含量呈有关,同一油淬温度下,YG20C性能的提升要高于YG11C,YG11C经1 000~1 200℃油淬后,抗弯强度略有提高,冲击韧性略有降低,1 250℃油淬后,抗弯强度略有降低,冲击韧性进一步降低;YG20C经1 000~1 250℃油淬后,抗弯强度和冲击韧性均提高,并在1 200℃达到最大值;YG11C和YG20C的油淬温度均不应超过1 200℃。
[Abstract]:The effect of oil quenching temperature on the microstructure and properties of YG11C and YG20C cemented carbide was studied. The two alloys were quenched at 1 000~1 250 C and tempered at 500 C. The properties of the alloy after oil quenching were analyzed, the structure and composition of Co phase, the microstructure and the three-dimensional morphology of WC grains were analyzed. The results showed that the quenching heat treatment of oil quenched to YG11C and YG20C The density, hardness and coercive magnetic force of the alloy are less affected, and the cobalt magnetism of the alloy gradually decreases with the increase of the oil quenching temperature; the quenching heat treatment will not change the average grain size of the WC, but the three-dimensional morphology of the WC grain is more circular with the increase of the oil quenching temperature; the content of the epsilon -Co (HCP) in the alloy decreases with the increase of the oil quenching temperature, and the alpha -Co (FCC) is contained in the alloy. As the amount is increasing, the peak position of alpha -Co (FCC) is also shifted, the content of W in Co phase increases and the lattice constant of Co atoms increases. The effect of the quenching heat treatment is related to the Co content of the alloy. At the same oil quenching temperature, the performance of YG20C is higher than that of YG11C, and the flexural strength of YG11C is slightly increased after the oil quenching at 1 000~1 200 c. The flexural toughness is slightly lower. After oil quenching at 1250 C, the bending strength is slightly reduced and the impact toughness is further reduced. After oil quenching at 1 000~1 250 C, the flexural strength and impact toughness of YG20C are increased and the maximum value is reached at 1200. The oil quenching temperature of YG11C and YG20C should not exceed 1200 degrees C.

【作者单位】：硬质合金国家重点实验室;株洲硬质合金集团有限公司;中南大学粉末冶金国家重点实验室;
【分类号】：TG156;TG135.5

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