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首页> 外文期刊>ISIJ international >Development of high strength hot-rolled sheet steel consisting of ferrite and nanometer-sized carbides
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Development of high strength hot-rolled sheet steel consisting of ferrite and nanometer-sized carbides

机译：由铁素体和纳米碳化物组成的高强度热轧钢板的开发

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A ferritic steel precipitation-strengthened by nanometer-sized carbides was developed to obtain a high strength hot-rolled sheet steel having tensile strength of 780 MPa grade with excellent stretch flange formability. Manganese in a content of 1.5 % and molybdenum in a content of 0.2 % were added to 0.04 % carbon Tibearing steel in order to lower austenite-ferrite transformation temperature for fine carbides and to retard generating of pearlite and large cementites, respectively. Tensile strength of hot-rolled sheet steel increased with titanium content and it was achieved to 800 MPa in a 0.09 % Ti steel. Microstructure of the 0.09 %Ti steel was ferrite without pearlite and large cementites. Fine carbides of 3 nm in diameter were observed in rows in the ferrite matrix of the 0.09 % Ti steel with transmission electron microscope. The characteristic arrangement of the nanometer-sized carbides indicates that the carbides were formed at austenite-ferrite interfaces during transformation. By energy dispersive X-ray spectroscopy, the carbides were found to contain molybdenum in the same atomic concentration as titanium. Crystal structure of the nanometer-sized carbides was determined to be NaCl-type by X-ray diffractometry. The calculated amount of precipitationstrengthening by the carbides was approximately 300 MPa. This is two or three times higher than that of conventional Ti-bearing high strength hot-rolled sheet steels. Based on the results obtained in the laboratory investigation, mill trial was carried out. The developed hotrolled high strength sheet steel exhibited excellent stretch flange formability.
机译：开发出通过用纳米级碳化物沉淀强化的铁素体钢，以获得拉伸强度为780 MPa级且拉伸凸缘成形性优异的高强度热轧钢板。为了降低细碳化物的奥氏体-铁素体相变温度并分别抑制珠光体和大渗碳体的生成，将锰含量为1.5％的钼和钼含量为0.2％的钼添加到0.04％的碳钛轴承钢中。热轧钢板的拉伸强度随钛含量的增加而增加，在0.09％的Ti钢中达到800 MPa。 0.09％Ti钢的组织是没有珠光体和大渗碳体的铁素体。用透射电子显微镜在0.09％Ti钢的铁素体基体中成排观察到直径3 nm的细碳化物。纳米尺寸碳化物的特征排列表明，碳化物是在相变过程中在奥氏体-铁素体界面形成的。通过能量色散X射线光谱法，发现碳化物含有与钛相同原子浓度的钼。通过X射线衍射法将纳米级碳化物的晶体结构确定为NaCl型。计算出的通过碳化物强化的沉淀量约为300 MPa。这是传统的含钛高强度热轧钢板的两倍或三倍。根据在实验室研究中获得的结果，进行了工厂试验。开发的热轧高强度钢板表现出优异的拉伸凸缘成形性。

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