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采用热模拟的方法研究了FB2钢(一种新型9%Cr马氏体耐热钢)中Laves相在焊接热循环中的演化行为.首先借助SEM观察到存在于原始供货状态下的FB2钢中尺寸在微米级别的Laves相颗粒;进一步的分析表明,这些Laves相的出现是由铸造过程中的枝晶偏析导致的.焊接热模拟实验结果表明,在加热过程中,Laves相与基体γ-Fe发生共晶反应导致的组分液化会给FB2钢热影响区带来热裂倾向;在冷却后的样品中发现了一些网状的共晶组织,利用SEM/EDS和TEM分别得到了该共晶组织的成分信息和结构信息,确定该共晶组织的2个组分为X相和γ-Fe.在此基础之上,较为详细地分析了不同峰值温度热模拟后样品中共晶组织的形成过程,解释了共晶组织不同形貌的产生原因.
The thermal behavior of Laves phase in FB2 steel, a new type of 9% Cr martensite heat-resistant steel, during the welding thermal cycle was investigated by means of thermal simulation.Firstly SEM was used to observe the existence of FB2 steel The results show that these Laves phases are caused by the dendritic segregation in the casting process.The results of the soldering heat simulation show that the Laves phase and the γ- The liquefaction of the components caused by the eutectic reaction of Fe will lead to the thermal cracking tendency in the heat affected zone of FB2 steel. Some reticular eutectic structures are found in the cooled samples, and the total eutectic structures are obtained by SEM / EDS and TEM Crystal structure information and structure information to determine the eutectic structure of the two components of the X-phase and γ-Fe.On the basis of this, more detailed analysis of the different peak temperature after the thermal simulation of the sample eutectic formation Process, explain the eutectic organization of different topography causes.