Field Daniel M, Limmer Krista R, Hornbuckle Billy C, Pierce Dean T, Moore Ken E, Sebeck Katherine M
US Army Combat Capabilities Development Command Army Research Laboratory, Aberdeen Proving Ground, Aberdeen, MD 21005, USA.
Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA.
Materials (Basel). 2022 Feb 23;15(5):1670. doi: 10.3390/ma15051670.
Alloy partitioning during heat treatment in a lightweight precipitation hardened steel was investigated using transmission electron microscopy and atom probe tomography. The mechanical properties are discussed as a function of the effect of solution treatment temperature and aging time, giving rise to variations in chemical modulation. A wrought lightweight steel alloy with a nominal composition of Fe-30Mn-9Al-1Si-1C-0.5Mo (wt. %) was solution-treated between 1173-1273 K and aged at 773 K. Lower solution treatment temperatures retained a finer grain size and accelerated age hardening response that also produced an improved work hardening behavior with a tensile strength of -1460 MPa at 0.4 true strain. Atom probe tomography indicated these conditions also had reduced modulation in the Si and Al content due to the reduced aging time preventing silicon from diffusing out of the κ-carbide into the austenite. This work provides the framework for heat-treating lightweight, age hardenable steels with high strength and improved energy absorption.
采用透射电子显微镜和原子探针断层扫描技术研究了一种轻质沉淀硬化钢在热处理过程中的合金分配情况。讨论了力学性能与固溶处理温度和时效时间的关系，这会导致化学调制的变化。一种名义成分为Fe-30Mn-9Al-1Si-1C-0.5Mo（重量百分比）的变形轻质钢合金在1173 - 1273 K之间进行固溶处理，并在773 K时效。较低的固溶处理温度保留了更细的晶粒尺寸，并加速了时效硬化响应，这也产生了改善的加工硬化行为，在0.4真应变下的抗拉强度为-1460 MPa。原子探针断层扫描表明，由于时效时间缩短，阻止了硅从κ碳化物扩散到奥氏体中，这些条件下Si和Al含量的调制也减少了。这项工作为热处理具有高强度和改善能量吸收的轻质可时效硬化钢提供了框架。
