首页> 外文会议>Liege Conference on Materials for Advanced Power Engineering >DEVELOPMENT OF HIGH STRENGTH 9CR STEEL BY COMBINATION OF FINE MX-TYPE NITRIDES AND NO CARBIDE
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DEVELOPMENT OF HIGH STRENGTH 9CR STEEL BY COMBINATION OF FINE MX-TYPE NITRIDES AND NO CARBIDE

机译:通过细胞膜型氮化物组合和无碳化物组合开发高强度9CR钢

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The improvement of creep strength has been achieved for 9Cr steel by optimized distributions of fine MX-type nitrides. The creep test was carried out for 9Cr-3W-VNb-N steels containing 0.002 and 0.08 mass%C at 923K and 160MPa for up to about 10{sup}4h. The creep rupture strength is much larger for the extremely low carbon steel (0.002mass%C) than for the steels containing carbon of 0.08 mass%. The creep life of the extremely low carbon steel at 923K and 160MPa is about ten times as large as that of the steel containing 0.08 mass%C. The microstructures of the steels examined are observed to be tempered martensite. A large number of fine MX identified as nitrides having a size of 2-20nm are distributed on grain boundaries as well as on lath boundaries in the extremely low carbon 9Cr steel after tempering. A combination of the removal of any carbide whose coarsening rate is much larger than that of nitrides and the fine distributions of MX-type nitrides is significantly effective for the stabilization of a high density of dislocations as well as a variety of boundaries in the martensitic 9Cr steel for up to long times at 923K.
机译:通过优化的细mx型氮化物分布实现了9CR钢的蠕变强度的提高。蠕变试验在923K和160MPa下含有0.002和0.08质量%C的9Cr-3W-VNB-N钢,高达约10°} 4h。对于极低的碳钢(0.002mas%C)而言,蠕变破裂强度比含有0.08质量%的碳的钢更大。 923K和160MPa的极低碳钢的蠕变寿命约为含有0.08质量%C的钢的十倍。观察所检查钢的微观结构是锻炼马氏体。将含有2-20nm尺寸的氮化物鉴定为氮化物的大量细mx分布在晶界上以及回火后极低碳9cr钢中的Lath边界。除去粗糙率大于氮化物大于氮化物的碳化物的组合和Mx型氮化物的细分布对于稳定高密度的脱位以及马氏体9Cr中的各种边界显着有效钢在923K时长达长时间。

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