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利用热膨胀法,通过Gleeble1500热模拟机测定了P92钢焊接连续冷却转变过程中的膨胀曲线。采用共聚焦显微镜,扫描电镜对不同冷却速度下的试样进行显微组织观察及分析;利用显微硬度计测量了不同冷速下的显微硬度。通过对P92钢连续冷却特性分析和比较得出P92钢的焊接连续冷却转变曲线(SH-CCT曲线)。结果表明,P92钢的焊接CCT曲线分为两个区域,在高温区的类珠光体转变区,在低温区的马氏体转变区。P92钢在0.01~0.1℃/s的冷速范围内获得类珠光体+马氏体+残留奥氏体的混合组织;当冷却速度大于等于0.5℃/s时,获得马氏体与残留奥氏体的混合组织。
By using thermal expansion method, the expansion curve of P92 steel during continuous cooling transformation was measured by Gleeble1500 thermal simulator. Using confocal microscope and scanning electron microscope, the microstructures of the samples at different cooling rates were observed and analyzed. The microhardness of the samples at different cooling rates was measured by microhardness tester. By continuous cooling of P92 steel analysis and comparison of the results obtained P92 steel continuous cooling transformation curve (SH-CCT curve). The results show that the welding CCT curve of P92 steel is divided into two regions, the pearlite-like transformation zone in the high temperature zone and the martensitic transformation zone in the low temperature zone. The microstructure of P92 steels with pearlite + martensite + retained austenite was obtained at the cooling rate range of 0.01 ~ 0.1 ℃ / s. When the cooling rate was greater than or equal to 0.5 ℃ / s, martensite and residual austenite Mixed body of body.