Influence of material condition and surface properties of high strength steels with regard to their susceptibility to hydrogen-induced stress corrosion cracking

在许多应用领域对轻质结构的需求伴随着对高强度钢的更多使用的需求。由于这一发展，当存在一定条件时，高强度钢部件有相当大的风险因氢致应力腐蚀破裂(H-SCC)而失效。H-SCC的发生必须满足以下要求：应力，例如残余应力、操作应力和氢气供应，例如材料的制造(酸洗工艺)或操作(腐蚀)条件，例如高强度、表面组织、三角洲铁素体。因此，有必要进行研究，以收集关于材料条件和其对H-SCC的敏感性之间的基本机制的知识，从而收集基于微观结构的机制的知识，基于最新的现象学发现，系统地研究了材料、力学性能、显微组织、硬化过程(调质或贝氏体态)和表面状态的影响。根据研究结果，建立了一个基于机理的概念模型，该模型描述了材料条件特定的因素及其对高强度钢热应力腐蚀敏感性的贡献的相对影响。

The need for lightweight construction in many fields of application comes along with the demand for an increased use of high strength steels. Due to this development there is a considerable risk for high-strength steel components to fail by hydrogen-induced stress corrosion cracking (H-SCC), when certain conditions are present.The following requirements must be met for the occurrence of H-SCC:Stress, e.g. residual stress, operational stressHydrogen supply, e.g. from manufacturing (pickling process) or operation (corrosion)Condition of the material, for example high strength, surface microstructure, delta ferrite.Therefore, there is a fundamental need for research to gather knowledge of the fundamental mechanisms between the condition of the material and its susceptibility to H-SCC and thereby the microstructural based mechanisms, which are responsible for H-SCC.Based on recent phenomenological findings, systematical investigations are carried out, taking into account the influence of the material, the mechanical properties, the microstructure, the hardening procedure (quenched and tempered or bainitic) and the surface state. From the findings, a mecha-nism based conceptual model is formulated, that describes the material condition-specific factors and their relative influence in terms of their contribution to the susceptibility of high strength steels to H-SCC.