This paper presents a detailed experimental approach to extract the critical resolved shear stress (CRSS) and the saturation stress of the elementary constituents of the microstructure of quenched S41500 martensitic stainless steel by conducting various microscopy observations and microtensile testing. To the authors' knowledge, the direct extraction of micromechanical properties of a single martensite variant by tensile testing has never been performed. However, the literature does propose studies that measured the mechanical properties of the bulk or small volumes containing a few variants. In this work, a particular attention is dedicated to the preparation of the specimens from the macro to the microscale, where final machining of test specimens was made using a Gallium Focused Ion Beam (Ga-FIB). In the present work, the CRSSs of {110}, {211} and {123} plane-related slip systems were directly measured. The post-experiment analysis showed no significant difference between the slip resistance of those planes. To relate this effort with previous work, a comparison with results from the literature was made using a similar testing procedure in lath martensite, revealing similar values of CRSS. The slip resistance saturation was also measured on different slip systems, and the data suggest a very similar hardening behavior for most of the samples tested. Finally, cross-slip remains, in this alloy, a very potent mechanism to reduce the strain hardening that can arise from clusters of nanoparticles observed by TEM.

本文提出了一种详细的实验方法，通过进行各种显微观察和显微拉伸试验来提取淬火 S41500 马氏体不锈钢显微组织基本成分的临界分辨剪切应力 (CRSS) 和饱和应力。据作者所知，从未进行过通过拉伸试验直接提取单个马氏体变体的微观力学特性的方法。然而，文献确实提出了测量包含一些变体的大体积或小体积的机械性能的研究。在这项工作中，特别关注从宏观到微观尺度的试样制备，其中使用镓聚焦离子束 (Ga-FIB) 对试样进行最终加工。在目前的工作中，{110} 的 CRSS，直接测量了{211}和{123}平面相关的滑移系统。实验后分析表明，这些飞机的防滑性没有显着差异。为了将这项工作与以前的工作联系起来，使用类似的板条马氏体测试程序与文献结果进行了比较，揭示了类似的 CRSS 值。还在不同的滑动系统上测量了滑动阻力饱和度，数据表明大多数测试样品的硬化行为非常相似。最后，在这种合金中，交叉滑移仍然是一种非常有效的机制，可以减少由 TEM 观察到的纳米粒子簇引起的应变硬化。为了将这项工作与以前的工作联系起来，使用类似的板条马氏体测试程序与文献结果进行了比较，揭示了类似的 CRSS 值。还在不同的滑动系统上测量了滑动阻力饱和度，数据表明大多数测试样品的硬化行为非常相似。最后，在这种合金中，交叉滑移仍然是一种非常有效的机制，可以减少由 TEM 观察到的纳米粒子簇引起的应变硬化。为了将这项工作与以前的工作联系起来，使用类似的板条马氏体测试程序与文献结果进行了比较，揭示了类似的 CRSS 值。还在不同的滑动系统上测量了滑动阻力饱和度，数据表明大多数测试样品的硬化行为非常相似。最后，在这种合金中，交叉滑移仍然是一种非常有效的机制，可以减少由 TEM 观察到的纳米粒子簇引起的应变硬化。