Ti-Mo微合金钢中第二相临界转换尺寸研究

发布时间：2018-09-14 09:36

【摘要】：使用TEM和三维原子探针(3DAP)等方法研究了Ti-Mo微合金钢在时效过程中第二相的临界转化尺寸。用显微硬度判定了等温回火时析出物强化的转变点。结果表明:Ti-Mo微合金钢在1250℃固溶0.5h后淬火并在650℃回火1h时硬度出现峰值,用3DAP测量其等效半径约为1.3 nm。根据第二相与位错交互作用的强化理论,析出相与基体的平均错配度在0.03~0.09,共格应变强化主导切过机制。在位错切过机制向绕过机制转变时,通过强化理论计算的第二相的临界转换半径为1.3 nm,与3DAP测量值吻合。
[Abstract]:The critical transformation size of the second phase of Ti-Mo microalloyed steel during aging was studied by means of TEM and three dimensional atomic probe (3DAP). The transformation point of precipitation strengthening during isothermal tempering was determined by microhardness. The results show that the hardness of the microalloyed steel reaches a peak value after quenching at 1250 鈩，

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