研究了碳含量(0.13%,0.25%,0.32%,质量分数)对Cr25系高铬铸钢显微组织、高温抗氧化性能及高温耐磨性的影响.结果表明:不同碳含量铸钢的显微组织均由铁素体和(Cr·Fe)23C6型碳化物组成,随着碳含量增加,碳化物由不连续长杆状转变成连续网状,且由完全沿晶析出逐步转成沿晶和晶内析出;在1 200 ℃高温氧化初期,试验钢快速氧化,氧化40 h后,因表面形成致密的铬氧化物保护层,氧化速率趋缓,进入稳定氧化阶段;随着碳含量增加,试验钢的高温抗氧化性降低,耐磨性增强,磨损机制由黏着磨损变为黏着及磨粒磨损共同作用机制.
The effects of carbon content (0.13wt%, 0.25wt% and 0.32wt%) on the microstructure, high-temperature oxidation resistance and high-temperature wear resistance of Cr25 high-chromium cast steel were investigated.The results show that the microstructures of the cast steels with different carbon content are composed of ferrite matrix and (Cr·Fe)23C6 carbide.The morphology of carbides changes from discontinuous rod-like to continuous net-like, and the precipitation way changes from intergranular to intergranular and intragranular precipitation.In the early stage of oxidation at 1 200 ℃, the tested steel is oxidizing rapidly.After oxidation for 40 h, the oxidation rate tends to remain stable and the tested steel is in a stable oxidation stage due to the chromium oxide protective layer formed on the surface.With the increase of carbon content, the high-temperature oxidation resistance of the tested steel decreases while the wear resistance increases, and the wear mechanism changes from adhesive wear to the combining of adhesive and abrasive wear.
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