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Study on selective oxidation of a Mn-Al advanced high strength steel

机译：Mn-A1先进高强度钢的选择性氧化研究

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Due to the strong demand on reducing the vehicle weight in automotive industries in order to improve the fuel efficiency without scarifying passenger's safety, researches on developing advanced high strength steels (AHSS) having high strength (>1 GPa) and high ductility (>20%) have been carried extensively in recent years [1-3]. Fig. 1 show a stress and strain curve of a cold-rolled Mn-Al AHSS sheet under development. The steel contains 5.7 wt% Mn and exhibits a tensile strength of 1.1 GPa and a total elongation of 34%, which fulfill the above mentioned requirement. However, an extensive application of the steel relies not only on its superior mechanical properties but also on properties such as weldability and galvanizability. In this study, the selective oxidation behavior of this Mn-Al steel during annealing was studied by employing x-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The steel was annealed in a protective atmosphere of N_2+10%H_2 with a dew point of-70, -30 or 0 °C. The XPS depth profiles of oxygen for the annealed samples shown in Fig. 2a indicate that the samples are covered by an oxide layer of approximately 100 nm thick regardless the dew point of the annealing atmosphere. However, the profiles of manganese and aluminum reveal that the composing oxides for sample annealed at a low dew point of-70 °C are very different from those formed at dew point 0 °C. The oxides formed at dew point -70 °C are mainly Al containing oxides such as Al_2O_3 and MnAl_2O_4, whereas MnO is the main oxide formed at dew point 0 °C. In addition to the macroscopic difference of the oxides formed, ex-situ experiments have been carried out to clarify the effect of the microstructure on the oxide formation. Fig. 3 shows the SEM images of the same area prior to and after annealing. The surface of the sample was electro-polished prior to annealing. Fig. 3a shows that the steel contains interwined ferrite and austenite grains of 0.5-2 ujm in size. The austenite grains exhibit a rougher surface prior to annealing and are covered by a thicker layer of oxide after annealing, as compared to the ferrite counterparts. Energy dispersive x-ray microanalyses indicated that the thick oxide layer on austenite is composed of MnO whereas the thin oxides on ferrite is Al_2O_3.
机译：由于对汽车产业中的车辆重量的强烈需求，以提高燃料效率而不克服乘客的安全性，研究高强度（AHS）具有高强度（> 1 GPa）和高延性（> 20％）的研究）近年来已经过度携带[1-3]。图。图1示出了开发的冷轧MN-Al AHSS板的应力和应变曲线。钢含有5.7wt％Mn，表现出1.1GPa的拉伸强度，并且总伸长率为34％，其满足上述要求。然而，钢的广泛应用不仅依靠其优越的机械性能，而且依赖于焊接性和镀锌性等性质。在该研究中，通过采用X射线光电子能谱（XPS），扫描电子显微镜（SEM）和透射电子显微镜（TEM）来研究这种Mn-Al钢期间的选择性氧化行为。将钢在N_2 + 10％H_2的保护气氛中退火，露点为-70，-30或0℃。图2A中所示的退火样品的氧气的氧气深度轮廓表明，无论退火气氛的露点，还由约100nm厚的氧化物层覆盖。然而，锰和铝的曲线表明，在低露点的样品中退火的作曲氧化物与在露点0℃下形成的那些不同。在露点-70℃下形成的氧化物主要是含有氧化物，例如Al_2O_3和Mnal_2O_4，而MnO是在露点0℃下形成的主氧化物。除了形成的氧化物的宏观差异之外，已经进行了出原位实验，以阐明微观结构对氧化物形成的影响。图。图3示出了退火前和之后的相同区域的SEM图像。在退火之前，样品的表面被电抛光。图。图3A示出了钢含有0.5-2 UJM的间隔的铁素体和奥氏体晶粒。与铁氧体对应物相比，奥氏体晶粒在退火之前在退火之前表现出变形的表面，并在退火后被退火后覆盖层覆盖。能量分散X射线微肿瘤表明奥氏体上的厚氧化物层由MnO组成，而铁氧体上的薄氧化物是Al_2O_3。

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