Particle-induced damage in Fe–TiB2 high stiffness metal matrix composite steels
Particle-induced damage in Fe–TiB2 high stiffness metal matrix composite steels
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DOI：
10.1016/j.matdes.2018.09.033
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发表时间：
2018-12
影响因子：
8.4
通讯作者：
Ding Wang;P. Shanthraj;H. Springer;D. Raabe
中科院分区：
文献类型：
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作者：
Ding Wang;P. Shanthraj;H. Springer;D. Raabe
Fe-TiB 2金属基复合材料是一种高模量钢，由于其高的刚度/密度比，在轻量化设计中具有很大的应用潜力。然而，所观察到的由TiB 2颗粒引起的脆化严重限制了这些钢的应用。鉴于影响微观结构损伤的众多参数，确定颗粒微观结构对延性和韧性影响的实验研究是复杂的。因此，我们追求的是一种综合的计算材料工程方法，以获得理解和获得优化颗粒微观结构的指导方针，从而提高这些高模量钢的机械性能，特别是损伤容限。研究了颗粒聚集度、尺寸和体积分数等关键微观结构参数。模型的几何形状，统计和系统地产生不同的颗粒配置从随机到集群分布。采用晶体塑性快速傅里叶变换方法和一种新的相场损伤模型进行了模拟。颗粒配置对损伤的产生和演变的影响进行了评估，从模拟结果中，它被观察到，微观结构与均匀的颗粒分布的7至15体积%的TiB 2，没有大的TiB 2颗粒源于初级凝固，出现最有利于获得高模量钢优化的机械性能。
Fe–TiB2metal matrix composites, termed high modulus steels, have great potential for lightweight design applications due to their high stiffness/density ratio. However, the observed embrittlement, caused by the TiB2particles, critically limits application of these steels. Experimental studies to identify the influence of particle microstructure on ductility and toughness are complex in view of the multitude of parameters affecting microstructural damage. We therefore pursue instead an integrated computational materials engineering approach to gain understanding and derive guidelines for optimizing the particle microstructure and thus improve the mechanical properties, particularly the damage tolerance of these high modulus steels. Key microstructural parameters such as particle clustering degree, size and volume fraction were investigated. Model geometries were statistically and systematically generated with varied particle configurations from random to clustered distributions. Simulations were performed using a crystal plasticity Fast Fourier transformation method coupled with a novel phase field damage model. The influence of particle configuration on damage initiation and evolution was evaluated from the simulation results, and it was observed that microstructures with homogeneous particle distributions of 7 to 15 vol% TiB2,devoid of large TiB2particles stemming from primary solidification, appear most favorable for obtaining high modulus steels with optimized mechanical properties.