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通过实验室模拟微合金化含Ti钢连铸坯热送热装过程,并利用光学显微镜观察了室温条件下不同热履历试样的显微组织,分析了热送热装连铸坯组织演变的规律和特点。结果表明,700℃左右是不同热送温度的一个分界线,700℃以下热送试样均会发生奥氏体分解相变;700℃以上试样的高温组织为奥氏体,且奥氏体晶粒的大小基本相同;700℃以上热送热装试样的晶粒度较700℃以下粗大;不同的热送温度导致热处理室温显微组织有极大的差别,热送温度越高,二次奥氏体化过程越容易;热送温度越低,相变过程比较复杂;在700℃热送是较为合理的,可以尝试在750℃进行热送实践。
Through the laboratory simulation of the microstructure of the microalloyed Ti-bearing steel billets, the microstructure of the samples with different thermal history at room temperature was observed by optical microscope. The microstructure evolution of the hot- Laws and characteristics. The results show that 700 ℃ is a dividing line between different heat transfer temperature, and the samples heated below 700 ℃ will undergo austenite decomposition transformation. The high temperature microstructure of the sample above 700 ℃ is austenite, and austenite The size of the grains are basically the same; the grain size of hot-rolled hot-rolled samples above 700 ℃ is more coarse than that under 700 ℃; different hot-sending temperatures cause great difference in the microstructure of the room-temperature at the heat treatment, The easier the austenitization process is; the lower the heat transfer temperature is, the more complicated the phase transformation process is. The heat transfer at 700 ℃ is more reasonable and the heat transfer can be tried at 750 ℃.