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首页> 外文期刊>Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science >The Determining Role of Finish Cooling Temperature on the Microstructural Evolution and Precipitation Behavior in an Nb-V-Ti Microalloyed Steel in the Context of Newly Developed Ultrafast Cooling
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The Determining Role of Finish Cooling Temperature on the Microstructural Evolution and Precipitation Behavior in an Nb-V-Ti Microalloyed Steel in the Context of Newly Developed Ultrafast Cooling

机译：在新开发的超快冷却条件下，最终冷却温度对Nb-V-Ti微合金钢组织演变和析出行为的确定作用

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We have studied here the impact of finish cooling temperature on the microstructural evolution and precipitation behavior in Nb-V-Ti microalloyed steel through thermo-mechanical simulation in the context of newly developed ultrafast cooling system. The microstructural evolution was studied in terms of morphology and crystallography of precipitates using high-resolution transmission electron microscopy. At finish cooling temperature of 933 K and 893 K (660 degrees C and 620 degrees C), the microstructure primarily consisted of polygonal ferrite, together with a small amount of wedge-shaped acicular ferrite and lamellar pearlite, while, at 853 K and 813 K (580 degrees C and 540 degrees C), the microstructure consisted of lath bainite with fine inter-lath cementite and granular bainite with martensite/austenite (M/A) constituent. In all the finish cooling temperatures studied, the near-spherical precipitates of size range similar to 2 to 15 nm were randomly dispersed in ferrite and bainite matrix. The carbide precipitates were identified as (Nb, V) C with NaCl-type crystal structure. With a decrease in the finish cooling temperature, the size of the precipitates was decreased, while the number density first increased with a peak at 893 K (620 degrees C) and then decreased. Using Ashby-Orowan model, the contribution of the precipitation strengthening to yield strength was similar to 149 MPa at the finish cooling temperature of 893 K (620 degrees C). (C) The Minerals, Metals & Materials Society and ASM International 2016
机译：我们在新开发的超快速冷却系统的背景下，通过热机械模拟研究了最终冷却温度对Nb-V-Ti微合金钢的组织演变和析出行为的影响。使用高分辨率透射电子显微镜研究了析出物的形貌和晶体学，观察了微观结构的演变。在933 K和893 K（660摄氏度和620摄氏度）的最终冷却温度下，显微组织主要由多边形铁素体，少量楔形针状铁素体和层状珠光体组成，而在853 K和813处。 K（580摄氏度和540摄氏度），显微组织由带细层间渗碳体的板条贝氏体和具有马氏体/奥氏体（M / A）成分的粒状贝氏体组成。在研究的所有最终冷却温度下，尺寸范围接近2至15 nm的近球形沉淀物随机分散在铁素体和贝氏体基体中。碳化物沉淀被鉴定为具有NaCl型晶体结构的（Nb，V）C。随着最终冷却温度的降低，析出物的尺寸减小，而数密度首先以893 K（620摄氏度）的峰值增大，然后减小。使用Ashby-Orowan模型，在最终冷却温度893 K（620摄氏度）下，沉淀强化对屈服强度的贡献类似于149 MPa。 （C）矿产，金属与材料学会和ASM International 2016

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