水玻璃砂型铸造Fe3Al金属间化合物的组织和力学性能
Microstructure and Properties of Fe3Al Intermetallic Compounds Prepared by Water Glass Sand Casting
李亚敏1, 刘洪军1, 谢 斌2, 郝 远1
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作者单位:1. 兰州理工大学 有色金属合金及加工教育部重点实验室,甘肃 兰州 730050; 2. 兰州理工大学 材料科学与工程学院,甘肃 兰州 730050
中文关键字: Fe3Al;组织;力学性能;冲击断口
英文关键字:Fe3Al; microstructure; mechanical properties; impact fracture
中文摘要:研究了中频感应炉熔炼、水玻璃砂型冷却制备的Fe3A1金属间化合物合金铸态及热处理后的组织、力学性能和冲击断裂行为。结果表明:热处理后合金的抗拉强度σb提高了49 MPa,硬度由铸态时的21.6 HRC提高到了25 HRC,但合金的冲击韧度出现了较明显的下降;铸态时合金的断裂主要呈沿晶断裂特征,热处理后合金断口呈沿晶+穿晶的混合型断裂特征。
英文摘要:The Fe3Al alloy were melted in intermediate frequency induction furnace and solidified in water glass sand. The microstructure, mechanical properties and impact fracture characteristic of Fe3Al alloy were studied. The results show that after heat treatment, the tensile strength of the alloy increases by 49 MPa, the hardness increases from 21.6 HRC to 25 HRC, and the impact fracture toughness decreases; fracture characteristic is intercrystalline fracture in as-cast, it is intercrystalline and transcrystalline mixed fracture after heat treatment.