Effects of Nickel Element on Microstructure and Properties of VC Reinforced Iron-base Composite
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摘要: 以FeV粉、金属Ni粉、石墨等粉末为原料，在烧结温度1 150℃、压力20 MPa的条件下，原位合成了VC增强铁基复合材料。使用X射线衍射（XRD）分析物相，测试三点抗弯强度和洛氏硬度，并用扫描电镜（SEM）分析微观组织和断口形貌，结果表明：由于Ni元素具有稳定奥氏体的作用，当Ni含量超过6%时，铁基体开始出现α-Fe和γ-Fe双相，其微观组织为珠光体和奥氏体。试样的硬度和抗弯强度均随Ni含量的增加而升高，当Ni含量逐步增加至9%，硬度（HRC）从39增大至43.7，抗弯强度从1 028 MPa提升至1 926 MPa，断裂方式由解理断裂向韧窝断裂转变。Abstract: VC reinforced iron matrix composites were synthesized in situ from FeV powder,Ni powder and graphite powder under sintering temperature of 1 150 ℃ and pressure of 20 MPa.X-ray diffraction（XRD） was used to analyze the phases.Three-point bending strength and Rockwell hardness were tested,and scanning electron microscopy（SEM） was used to analyze the microstructure and fracture morphology.The results show that,due to the stabilization of austenite by Ni,dual phases of α-Fe and γ-Fe appear in the iron matrix when the content of Ni exceeds 6%,with its microstructure of pearlite and austenite.The hardness and bending strength of the specimens increase with the increase of Ni content.When Ni content increases to 9%,the hardness increases from 39 HRC to 43.7 HRC.The bending strength increases from 1 028 MPa to 1 926 MPa,and the fracture mode changes from cleavage fracture to dimple fracture.
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Key words:
- iron-base composite /
- VC /
- nickel content /
- microstructure /
- properties
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