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为了研究热送热装X80管线钢铸坯析出行为,使用了析出物定量分析、TEM和EDS测试方法,分析研究了析出物的成分、形貌、分布、质量分数以及频度分布情况.结果表明:两种工艺制度下,铸坯中析出物主要在奥氏体晶界析出,尺寸较大.室温装炉铸坯析出物在冷却和加热保温过程中发生析出、回溶和再析出行为,枝晶状的析出物大部分回溶并重新析出为两类碳氮化物,即富Ti和富Nb的(Ti,Nb)(C,N)碳氮化物.1 100℃热装态的铸坯在加热和保温过程中将主要发生析出行为,析出颗粒的总质量分数要低于室温装炉条件,并且铸坯中固溶Nb的质量分数要远高于室温装炉条件.
In order to study the precipitation behavior of X80 pipeline steel billets, the quantitative analysis of precipitates, TEM and EDS were used to analyze the composition, morphology, distribution, mass fraction and frequency distribution of precipitates. : Under the two technological systems, the precipitates in the slab are mainly precipitated at the austenite grain boundaries and are larger in size, the precipitates, the solution and the reprecipitation of precipitates from the slab at room temperature during cooling and heating and heat preservation occur, Most of the crystalline precipitates are back-dissolved and re-precipitated into two types of carbonitrides, namely (Ti, Nb) (C, N) carbonitrides rich in Ti and Nb. During the heating and holding process, the precipitation will occur mainly, the total mass fraction of precipitated particles will be lower than that at room temperature, and the mass fraction of solid solution Nb in slab is much higher than that at room temperature.