10Cr9MolVNbN钢奥氏体化及时效后的组织和性能研究

【作者】 戴熹；

【导师】 符长璞； 赵麦群；

【作者基本信息】 西安理工大学 ， 材料学， 2000， 硕士

【摘要】 本文采用透射电镜、扫描电镜等手段研究了10Cr9Mol VNbN钢不同温度和时间奥氏体化正火后以及正火高温回火后再经580～660℃时效0～5000h的组织和性能的关系。研究发现： 国产10Cr9MolVNbN钢最佳奥氏体化温度为1040～1060℃。在1120℃超高温奥氏体化条件下仍存在NbC或Nb（C.N）残留碳化物。正火冷却后的马氏体板条中有针状M₂C碳化物析出。 10Cr9MolVNbN会在580～660℃时效500～1000h后强度和韧性出现最低值。并证明这种现象是与大量粗大的M₂₃C₆沿原奥氏体晶界呈连续网状析出及M₂₃C₆聚集成树枝状和鱼骨状分布有关。580～660℃时效降低该钢的冲击韧性。更多还原

【Abstract】 In this paper,the relationships of structures and properties of 10Cr9MolVNbNsteel austenization normalizing at different temperature and time and dustenizationnormalizing and high temperature tempering following aging at 580 - 660℃ for zero to5000h were studied by means of transmission electron microscope （TEM） and scanningelectron microscope （SEM）.The results are as follow: The optimum austenitise temperatrue of domestic manufacture 10Cr9MolVNbNsteel is 1040 l060℃ .Residual carbide such as NbC or Nb（C,N）still exist when the steelwas austenitise at super-high temperature,1120℃ .There are carbides M₃Cthat like meedlesseparate out from plank martensite after normalizing.The value of strength and toughness was lowest When 10Cr9MolVNbN aging at580 660℃ for 500 1000h.ttis phenomenon was explain as too much coarse carbideM₂₃C₆ continuous separate out along austenite boundary like net and carbide M₂₃C₆ gathertogether as branches of tree or fishbone.The impact toughness of this kind of steel will bedescent when it is aged at 580 660℃.更多还原