The primary objective of the study is to elucidate the effect of strain rate on the deformation behavior of Al-containing transformation-induced plasticity steels (TRIP) via combination of depth-sensing nanoindentation experiments and post-mortem analyses of deformed steels using transmission electron microscopy (TEM). The strain rate sensitivity decreased with increased Al-content. The activation volume of 2Al-steel was ~ half (6b³) of 6Al-steel (11b³), where b is the magnitude of the Burgers vector. The strain rate influenced the evolution of strain-induced martensite (TRIP effect), dislocation slip and deformation twinning (TWIP effect). The interplay between TRIP and TWIP effects as a function of strain rate is analyzed and discussed in terms of the three internal energies, namely γ→α (austenite→martensite) transformation Gibbs free energy, strain energy and stacking fault energy. These were impacted by the Al-content of the steels, which altered the austenite stability and propensity to deformation twinning. The study provides insights into the design of next generation of TRIP steels for the fabrication of automotive components.

该研究的主要目的是结合深度感应纳米压痕实验和变形钢的事后分析（采用透射电子显微镜），阐明应变速率对含铝相变诱发塑性钢（TRIP）变形行为的影响。 （TEM）。应变速率敏感性随Al含量的增加而降低。2Al钢的活化量约为6Al钢（11b ³）的一半（6b ³）），其中b是Burgers向量的大小。应变速率影响应变诱发马氏体的演化（TRIP效应），位错滑移和变形孪晶（TWIP效应）。根据三个内部能量，即γ→α（奥氏体→马氏体）变换吉布斯自由能，应变能和堆垛层错能，分析和讨论了TRIP和TWIP效应之间的相互作用与应变率的关系。这些受到钢中铝含量的影响，从而改变了奥氏体的稳定性和变形孪晶的倾向。该研究为汽车零件制造的下一代TRIP钢的设计提供了见识。