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首页> 外文会议>Iron Steel Supplement 2005 vol.40: The Joint International Conference of HSLA Steels 2005 and ISUGS 2005 >Second Phase Particles and Intragranular Ferrite Nucleation in Microalloyed V-N Steels
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Second Phase Particles and Intragranular Ferrite Nucleation in Microalloyed V-N Steels

机译：微合金V-N钢中的第二相颗粒和晶内铁素体成核

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摘要

Effects of alloying elements nitrogen and vanadium on γ → α microstructure transformation in microalloyed V-N steels were studied. Experimental evidences was collected for second phase particles VN as preferred nucleation sites of intragranular ferrite(IGF). Phase transformation heat simulation(TMCP) was performed for deformation reduction 30% at 900°C and isothermal holding at 700°C-600°C. Microstructure characteristics transformed γ → α steel were observed with optical microscope. Size, distribution of second phase particles VN and their function on IGF nucleation were observed with transmission electron microscope (TEM). The results show that the deformation in austenite phase region at high temperature, the increase of nitrogen in steel, lower isothermal temperature and longer holding time all increase ferrite formation. IGF formation at initiation period of γ → α transformation is related to the fine and dispersed particles VN.
机译：研究了氮和钒合金元素对微合金V-N钢中γ→α组织转变的影响。收集了第二相颗粒VN作为晶内铁素体（IGF）的优选成核位点的实验证据。进行相变热模拟（TMCP），以在900°C下变形减少30％，并在700°C-600°C下保持恒温。用光学显微镜观察了转变为γ→α钢的组织特征。用透射电子显微镜（TEM）观察第二相颗粒VN的大小，分布及其对IGF成核的作用。结果表明，高温下奥氏体相区的变形，钢中氮的增加，等温温度的降低和保温时间的延长都增加了铁素体的形成。 γ→α转变起始阶段的IGF形成与细小且分散的颗粒VN有关。

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