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利用“团簇加连接原子”结构模型研究了铁素体时效不锈钢的成分规律,确定了BCC Fe-Cr二元基础团簇成分式为[Cr-Fe10Cr4]Cr,其中团簇为以溶质原子Cr为心的周围被10个基体Fe和4个Cr原子包围的菱形十二面体Cr-Fe10Cr4。根据团簇式和相似组元替代形成多元合金化的合金成分式[(Ni16-m-nCumAln)-Fe160Cr64](Cr16-o-p-q-rMooTipNbqVr)。采用铜模吸铸技术制备6 mm的合金棒,分别在1030℃、1150℃下固溶处理0.5 h并在555℃时效3 h。结果表明,合金化的系列合金在1150℃下固溶处理时能获得单一BCC结构,在此基础上时效后系列合金的硬度和强度显著提高,其中[(Ni14Cu2)-(Fe160Cr64)](Cr7Mo6Ti2Nb1)合金在时效处理后具有良好的强韧性配合,分别为HV=397 HV、σ0.2=1017 MPa和σb=1287 MPa、ε=7.7%。
The compositional rules of ferritic stainless steel were studied by using the “cluster plus connected atom” structural model. The compositional formula of BCC Fe-Cr binary basic cluster was determined to be [Cr-Fe10Cr4] Cr. The clusters were solute The atom Cr is a diamond-shaped dodecahedron Cr-Fe10Cr4 surrounded by 10 matrix Fe and 4 Cr atoms around the heart. The multi-alloying alloy composition formula [(Ni16-m-nCumAln) -Fe160Cr64] (Cr16-o-p-q-rMooTipNbqVr) is substituted for the clusters and similar elements. The 6 mm alloy rods were prepared by copper mold suction casting, and were solution treated at 1030 ℃, 1150 ℃ for 0.5 h and aged at 555 ℃ for 3 h respectively. The results show that the hardness and strength of alloying alloys increase obviously when the alloy is alloyed at 1150 ℃ for solution treatment. Based on this, the hardness and strength of the alloys are significantly increased, and the [(Ni14Cu2) - (Fe160Cr64)] (Cr7Mo6Ti2Nb1) The alloy has good toughness after aging treatment, HV = 397 HV, σ0.2 = 1017 MPa and σb = 1287 MPa, ε = 7.7%.