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首页> 外文期刊>Materials Science and Engineering >Study of the influence of 8-ferrite on the TRIP effect of a low-density high aluminum steel by using full-field crystal plasticity modeling
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Study of the influence of 8-ferrite on the TRIP effect of a low-density high aluminum steel by using full-field crystal plasticity modeling

机译：利用全场晶体塑性模型研究8铁素体对低密度高铝钢TRIP效应的影响

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摘要

Low-density high aluminum transformation induced plasticity (TRIP) steel is a new developed light-weight structural material. In the conventional casting (CC) TRIP steel, however, the presence of high Al content results in the formation of coarse dendritic 8-ferrite, which seriously deteriorates the performance of the material. The spray forming process show good potential to refine and homogenize the microstructure. It was found that the 8-ferrite in the spray formed (SF) TRIP steel is refined remarkably and its distribution is more homogeneous. Uniaxial tension tests demonstrate that the ductility of the SF TRIP steel is increased by 5% compared with the CC TRIP steel. The difference of their properties is mainly due to the different morphologies of the 8-ferrite. We further employed a full-field crystal plasticity (CP) modeling to probe the micromechanical mechanisms in details, and a new simplified model was proposed to describe the TRIP effect and phase transformation. The material parameters of three individual phases δ-ferrite (δ), austenite (γ), and martensite (α') for the CP model were identified from the loading curves of nanoindentation tests. Through the simulation, it was found that compared with SF TRIP steel, there are large deformation bands formed in the CC TRIP steel during the deformation. These areas are the regions in which austenite has the priority to transform into martensite. It is the initial heterogeneity of deformation in the CC TRIP steel that results in the heterogeneous phase transformation, and thus intensifies the heterogeneous deformation at the phase boundaries, which ultimately accelerates the generation of cracks.
机译：低密度高铝转变诱导塑性（TRIP）钢是一种新型的轻质结构材料。然而，在常规的铸造（CC）TRIP钢中，高Al含量的存在会导致形成粗大的树枝状8-铁素体，这严重降低了材料的性能。喷射成形工艺显示出细化和均质化微结构的良好潜力。发现在喷射成形的（TRI）TRIP钢中的8-铁素体显着细化并且其分布更均匀。单轴拉伸试验表明，与CC TRIP钢相比，SF TRIP钢的延展性提高了5％。它们性质的差异主要是由于8铁氧体的形态不同。我们进一步采用了全场晶体可塑性（CP）模型来详细研究微机械机理，并提出了一个新的简化模型来描述TRIP效应和相变。从纳米压痕试验的载荷曲线确定了CP模型的三个独立相δ-铁素体（δ），奥氏体（γ）和马氏体（α'）的材料参数。通过仿真发现，与SF TRIP钢相比，CC TRIP钢在变形过程中会形成较大的变形带。这些区域是奥氏体优先转变为马氏体的区域。 CC TRIP钢中变形的初始异质性导致异质相变，从而加剧了相界处的异质变形，最终加速了裂纹的产生。

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