Microstructure and mechanical behavior of a low-density Fe–12Mn–9Al–1.2C steel prepared using centrifugal casting under near-rapid solidification
Microstructure and mechanical behavior of a low-density Fe–12Mn–9Al–1.2C steel prepared using centrifugal casting under near-rapid solidification
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DOI：
10.1007/s42243-018-0116-1
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发表时间：
2018-08
影响因子：
2.5
通讯作者：
W. He;Bi-lei Wang;Yang Yang-Yang;Yunhu Zhang;L. Duan;Zhiping Luo;C. Song;Q. Zhai
中科院分区：
文献类型：
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作者：
W. He;Bi-lei Wang;Yang Yang-Yang;Yunhu Zhang;L. Duan;Zhiping Luo;C. Song;Q. Zhai
汽车轻量化是汽车节能减排的关键。低密度Fe-Mn-Al-C钢具有高强度和优异的延展性，在汽车工业中已成为一种很有前途的材料。提出了一种采用离心铸造近净形近快速凝固制备高性能低密度Fe-12 Mn-9Al-1.2C钢的新方法。生产的钢带，厚度为2.5毫米，密度为6.89克/厘米3，检查其显微组织和机械性能。结果表明，铸态钢带的抗拉强度达到1182 MPa，延伸率达到28.1%。在400或600 °C时效3 h可提高钢带的抗拉强度，而在800 °C时效显著降低其伸长率。随着时效温度的升高，钢带的杨氏模量也随之提高。讨论了力学性能与显微组织的关系。结果表明，采用这种简单的工艺可以直接从液态中生产出具有良好力学性能的先进低密度钢。
It is vital for emission reduction and energy saving to lighten the weight of automobile. Low-density Fe–Mn–Al–C steels with high strength and excellent ductility have become a promising type of material in the automotive industry. Thus, a new approach was proposed by using centrifugal casting to produce the low-density Fe–12Mn–9Al–1.2C steel with high performance under near-rapid solidification in a near-net shape. The produced steel strips, with a thickness of 2.5 mm and a density of 6.89 g/cm3, were examined for their microstructures and mechanical properties. The results showed that mechanical properties of as-cast steel strip reached 1182 MPa in ultimate tensile strength and 28.1% in total elongation. Aging treatment at 400 or 600 °C for 3 h enhanced tensile strength of the steel strips, while aging at 800 °C dramatically decreased its elongation. Moreover, Young’s modulus of the steel strip improved with the increment of aging temperature. The relationship between the mechanical properties and the microstructures was discussed. The results demonstrated that advanced low-density steels with promising mechanical properties could be directly produced from liquid by this simple process.