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首页> 外文期刊>Materials Science and Engineering >Effect of microstructure on mechanical behavior for eutectoid steel with ultrafine- or fine-grained ferrite+cementite structure
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Effect of microstructure on mechanical behavior for eutectoid steel with ultrafine- or fine-grained ferrite+cementite structure

机译：显微组织对超细或细晶粒铁素体+渗碳体共析钢力学性能的影响

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摘要

A eutectoid steel with various ultrafine- or fine-grained ferrite matrix (α)+cementite particle (θ) structures was fabricated to explore the effects of the microstructural features on the mechanical behavior of hard particle-strengthened two-phase alloys. The effect of microstructure on the parameters of an analytical model and the mechanical behavior for the eutectoid steel with ultrafine- or fine-grained α+θ structure were analyzed basing on statistical data and physical metallurgy. The results showed that the rate of dislocation-storage caused by ferrite grain boundaries and cementite particles is approximately a microstructural constant and is proportional to the dislocation mean free path. The larger ferrite grains and the larger volume fraction of intragranular cementite particles are beneficial to obtaining a lower rate of dynamic recovery when ultrafine- or fine-grained α+θ structures with an equal dislocation mean free path, and the uniform elongation increases with the decrease in the rate of dynamic recovery. Moreover, the ultimate strength is closely related to the effective dislocation mean free path including both roles of the storage and the recovery of dislocations. It is feasible to design a microstructure consisting of ultrafine- or fine-grained ferrite matrix and tiny cementite particles mainly within grain interior to possess an enhanced strength-plasticity synergy for the eutectoid steel.
机译：制备了具有各种超细或细晶粒铁素体基体（α）+渗碳体颗粒（θ）结构的共析钢，以研究显微组织特征对硬质颗粒强化两相合金力学性能的影响。基于统计数据和物理冶金学，分析了微结构对解析模型参数的影响以及具有超细或细晶粒α+θ结构的共析钢的力学性能。结果表明，由铁素体晶界和渗碳体颗粒引起的位错-存储速率大约是微观结构常数，并且与位错平均自由程成正比。当具有相同位错平均自由程的超细或细晶粒α+θ结构时，较大的铁素体晶粒和较大的晶粒内渗碳体颗粒体积分数有利于获得较低的动态回复率，且均匀伸长率随减小而增加动态恢复的速度。此外，极限强度与有效位错平均自由程密切相关，包括存储作用和位错恢复。设计一种由超细晶粒或细晶粒铁素体基体和微小渗碳体颗粒（主要在晶粒内部）组成的组织，以提高共析钢的强度-塑性协同作用是可行的。

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