CAJ | 학술논문

研究VC/Cr3C2对Ti(C,N)基金属陶瓷微观组织和力学性能的影响.利用光学显微镜、X射线衍射仪和扫描电镜结合能谱仪研究微观组织.测试横向断裂强度、硬度和断裂韧性等力学性能.结果表明:微观组织中存在“黑芯-灰壳”和“白芯-灰壳”结构；由于添加VC/Cr3C2,硬质相晶粒变细,添加0.75VC/0.25Cr3C2的金属陶瓷晶粒细化最明显；黑芯随着VC添加量的增加而变细,壳随着Cr3C2添加量的减少而变厚;孔隙率随着VC/Cr3C2中VC的量增加而增大；横向断裂强度和硬度均升高,并且均在添加0.25VC/0.75Cr3C2时达到最大值；按适当的VC和Cr3C2添加量比例添加VC/Cr3C2可以有效地使断裂韧性升高,并在添加0.5VC/0.5Cr3C2时取得最大值.
연구VC/Cr3C2대Ti(C,N)기금속도자미관조직화역학성능적영향.이용광학현미경、X사선연사의화소묘전경결합능보의연구미관조직.측시횡향단렬강도、경도화단렬인성등역학성능.결과표명:미관조직중존재“흑심-회각”화“백심-회각”결구；유우첨가VC/Cr3C2,경질상정립변세,첨가0.75VC/0.25Cr3C2적금속도자정립세화최명현；흑심수착VC첨가량적증가이변세,각수착Cr3C2첨가량적감소이변후;공극솔수착VC/Cr3C2중VC적량증가이증대；횡향단렬강도화경도균승고,병차균재첨가0.25VC/0.75Cr3C2시체도최대치；안괄당적VC화Cr3C2첨가량비례첨가VC/Cr3C2가이유효지사단렬인성승고,병재첨가0.5VC/0.5Cr3C2시취득최대치.
Effects of VC/Cr3C2 on the microstructure and mechanical properties of Ti(C,N)-based cermets were studied.The microstructure was investigated by means of optical microscopy,X-ray diffractometry as well as scanning electron microscopy in combination with energy dispersive spectrometry.Mechanical properties,such as transverse rupture strength,hardness and fracture toughness,were measured.The results show that there are black core-grey rim structure and white core-grey rim structure in the microstructure.The grains become fine due to the VC/Cr3C2,and the grains of cermet added with 0.75VC/0.25Cr3C2 are refined most remarkably.The black core becomes finer with the increase of VC addition and rim phase becomes thicker with the decrease of Cr3C2 addition.The porosity increases with the increase of VC addition in VC/Cr3C2.Compared with the cermet free of VC/Cr3C2,the transverse rupture strength and hardness of cermets with VC/Cr3C2 are both improved,and the maximum values are both found for the cermet with 0.25VC/0.75Cr3C2.The fracture toughness can be effectively promoted by adding VC/Cr3C2 with an appropriate ratio of VC to Cr3C2,and the maximum value is found for the cermet with 0.5VC/0.5Cr3C2.