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钢的连续冷却转变曲线(CCT曲线)描述了过冷奥氏体在冷却过程中的相变行为,是指导钢实际热处理的重要特征曲线。从1932年Bain发表和应用钢的连续冷却转变曲线以来,传统的表述形式都是在温度一时间(对数座标)座标上画出冷却曲线,并描绘出各种组织的转变区域、转变百分数和按图中冷速冷却后的硬度。但是,在实际热处理中,冷却速度的大小是由零件尺寸与冷却介质(包括冷却方式)所决定。为了便于在热处理过程中直接运用CCT曲线,在英国,采用了一种新的CCT曲线的表达形式,并在
The continuous cooling transformation curve (CCT curve) of steel describes the phase transformation behavior of subcooled austenite during cooling and is an important characteristic curve of the actual heat treatment of guide steel. Since Bain published and applied the continuous cooling transformation curve of steel in 1932, the traditional form of expression is to draw the cooling curve on the coordinates of temperature for a time (logarithmic coordinates), and to describe the transformation area of various tissues and change Percentage and according to the figure cooling speed after cooling. However, in actual heat treatment, the cooling rate is determined by the size of the part and the cooling medium (including the cooling method). In order to facilitate the direct application of CCT curves during heat treatment, a new form of CCT curve was adopted in the UK