Fe-Cr-Si系合金的组织和高温氧化行为研究  

Research on Microstructure and High-temperature Oxidation Behavior of Fe-Cr-Si Alloy

作　　者：秦铁玉 宋春燕 马汝成 张学峰 郝威 贵永亮 QIN Tieyu;SONG Chunyan;MA Rucheng;ZHANG Xuefeng;HAO Wei;GUI Yongliang(College of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063210,China;Tangshan Key Laboratory of Special Metallurgy and Material Preparation,North China University of Science and Technology,Tangshan 063210,China)

机构地区：[1]华北理工大学冶金与能源学院,河北唐山063210 [2]华北理工大学唐山市特种冶金及材料制备重点实验室,河北唐山063210

出　　处：《热加工工艺》2023年第6期62-66,共5页Hot Working Technology

基　　金：河北省杰出青年科学基金项目(E2019209473);河北省高校百名优秀创新人才支持计划项目(III)(SLRC2019030);河北省人才工程培养资助项目(A201905010)。

摘　　要：Fe-Cr-Si系合金材料具有良好的耐磨、耐蚀及高温抗氧化等性能,特别是Cr、Si元素的引入能提高其高温抗氧化性能。利用电弧熔炼工艺制备了Fe20Cr10Si合金,利用XRD、SEM等研究了Fe20Cr10Si合金的显微组织和900℃空气环境中的高温氧化行为。结果表明,合金由初生Fe_(3)Si树枝晶和枝晶间Fe-Cr固溶体和γ-Fe相的共晶体组成。合金在900℃空气环境中的抗氧化能力是45钢的50倍。氧化形成Cr_(2)O_(3)和SiO_(2)复合氧化层对基体有保护作用,氧化前期Cr的氧化和扩散是氧化膜生长机制的主因,而后因氧化膜剥落转变为受Si的氧化和扩散控制。Fe-Cr-Si alloys material has good abrasion resistance,corrosion resistance and high temperature oxidation resistance,especially the introduction of Cr and Si element can furtherly improve its high temperature oxidation resistance.Fe-Cr-Si alloys was designed and prepared by arc furnace process and the microstructure and oxidation behavior of Fe-Cr-Si alloy was investigated by X-ray diffraction(XRD),scanning electron microscope(SEM).The results show that Fe-Cr-Si alloy is composed of primary dendrite and interdendrite matrix,and the metal silicide Fe_(3)Si appears in the microstructure.The oxidation resistance of the Fe-Cr-Si alloy increased by more than 50 times at 900℃compared with that of 45 steel.Oxidation forms a composite oxide layer of Cr_(2)O_(3) and SiO_(2) to protect the substrate.The oxidation and diffusion of Cr in the early stage of oxidation is the main cause of the oxide film growth mechanism,while later it changes to be controlled by the oxidation and diffusion of Si due to the oxide film flaking.

关 键 词：Fe-Cr-Si系合金 组织 氧化 氧化膜 

分 类 号：TG135[一般工业技术—材料科学与工程]