【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(shí)效過(guò)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(shí)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(shí)硬度出現(xiàn)峰值,用3DAP測(cè)量其等效半徑約為1.3 nm。根據(jù)第二相與位錯(cuò)交互作用的強(qiáng)化理論,析出相與基體的平均錯(cuò)配度在0.03~0.09,共格應(yīng)變強(qiáng)化主導(dǎo)切過(guò)機(jī)制。在位錯(cuò)切過(guò)機(jī)制向繞過(guò)機(jī)制轉(zhuǎn)變時(shí),通過(guò)強(qiáng)化理論計(jì)算的第二相的臨界轉(zhuǎn)換半徑為1.3 nm,與3DAP測(cè)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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