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在850-1050℃范围内系统分析了冷轧Fe-Mn-Al-C钢的力学性能、金相组织、XRD图谱以及断裂行为,研究其在退火过程中奥氏体、铁素体、碳化物与力学性能的转变规律。结果表明,在850℃退火处理后冷轧Fe-Mn-Al-C钢的组织为奥氏体+带状d-铁素体+a-铁素体+k碳化物,晶间网状铁素体和较高的碳化物含量使钢板具有较高的强度但是塑性极差,发生解理断裂;在900-1050℃钢板的基体为奥氏体组织,a-铁素体含量下降,而带状d-铁素体破碎呈不连续岛状分布;当d-铁素体长大程度超过奥氏体组织时,铁素体含量增大,XRD峰值升高;退火组织的转变导致抗拉强度随温度的升高而下降,断后伸长率提高;在1000℃时强塑积达到最高值,得到强度与韧性的良好组合,抗拉强度为1003.1 MPa,断后伸长率为41.28%,强塑积为41.41 GPa·%。为了使冷轧Fe-Mn-Al-C钢具有良好的强韧性,退火温度不可低于950℃。同时,Fe-Mn-Al-C钢的测量密度为6.55 g·cm-3,减重效果显著,达到16.6%。
The mechanical properties, microstructure, XRD patterns and fracture behavior of cold-rolled Fe-Mn-Al-C steel were systematically analyzed in the range of 850-1050 ℃. The effects of austenite, ferrite, And mechanical properties of the law of change. The results show that the microstructure of cold-rolled Fe-Mn-Al-C steel after annealing at 850 ℃ is austenite + banded d-ferrite + a-ferrite + k carbide, intergranular reticular ferrite Body and higher carbide content of the steel with high strength but very poor plasticity, cleavage fracture occurs; the substrate at 900-1050 ℃ austenitic steel substrate, a-ferrite decreased, while the strip d-ferrite disintegration was discontinuous island distribution; when d-ferrite grew more than austenite, the ferrite content increased, the XRD peak value increased; the transformation of the annealed tissue led to the tensile strength with The tensile elongation is 1003.1 MPa, the elongation at break is 41.28%, and the ductile plasticity is the highest at 1000 ℃ 41.41 GPa%. In order to make cold-rolled Fe-Mn-Al-C steel with good toughness, the annealing temperature can not be lower than 950 ℃. Meanwhile, the measured density of Fe-Mn-Al-C steel is 6.55 g · cm-3, and the weight loss is remarkable, reaching 16.6%.