In this work, an experimental-numerical screening method for studying the elastic–plastic properties in high strength steel subjected to environmentally assisted degradation due to hydrogen is proposed. The experiments were performed on single-edge-notch bend specimens loaded with a monotonic constant displacement rate, and the specimens were electrochemically hydrogen pre-charged and/or in-situ. A systematic investigation was conducted of the influence of current density, pre-charging time and loading rate on the fracture mechanical properties. It was found that the loading rate had the greatest effect on the J-R curves, and that the environmental ductile-to-brittle transition region was obtained in a less than a day of experimental time. In this transition region it was found from the fractography that the dominating mode of failure changed from dimple to dominating intergranular fracture.

在这项工作中，提出了一种实验数值筛选方法，用于研究在高强度钢中由于氢而受到环境辅助降解的弹塑性特性。实验是在单边缘缺口弯曲试样上加载单调恒定位移率，然后将试样用电化学方法对氢进行预充电和/或原位氢化。对电流密度，预充电时间和加载速率对断裂力学性能的影响进行了系统的研究。结果表明，加载速率对JR的影响最大曲线，并在不到一天的实验时间内获得了环境韧性到脆性的过渡区域。在该过渡区域中，从断层照相术中发现，破坏的主要方式从酒窝转变为主要的晶间骨折。