【摘要】：使用TEM和三維原子探針(3DAP)等方法研究了Ti-Mo微合金鋼在時效過程中第二相的臨界轉(zhuǎn)化尺寸。用顯微硬度判定了等溫回火時析出物強(qiáng)化的轉(zhuǎn)變點(diǎn)。結(jié)果表明:Ti-Mo微合金鋼在1250℃固溶0.5h后淬火并在650℃回火1h時硬度出現(xiàn)峰值,用3DAP測量其等效半徑約為1.3 nm。根據(jù)第二相與位錯交互作用的強(qiáng)化理論,析出相與基體的平均錯配度在0.03~0.09,共格應(yīng)變強(qiáng)化主導(dǎo)切過機(jī)制。在位錯切過機(jī)制向繞過機(jī)制轉(zhuǎn)變時,通過強(qiáng)化理論計算的第二相的臨界轉(zhuǎn)換半徑為1.3 nm,與3DAP測量值吻合。
[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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