Influence of the Local Hydrogen Concentration in Multi-Phase Steels on their Tendency to Hydrogen Induced Cracks

多相钢局部氢浓度对其氢致裂纹倾向的影响

• 批准号: 266684047
• 负责人: Professor Dr.-Ing. Michael Pohl
• 金额: --
• 依托单位: Lehrstuhl Werkstoffprüfung
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/266684047?language=en
• 关键词: Influence; Local; Hydrogen; Concentration; Multi

Increasing technological high-quality standards of car body- and power plant engineering lead to an increased use of high-strength steels. Due to the usage of these steels it is possible for example in car body construction to reduce the weight and thus the fuel consumption. Operation conditions however have to be adapted to these new demands. With increasing strength the sensibility for hydrogen induced cracking rises, too. It is known that even low amounts of hydrogen can lead to damage. This hydrogen concentrates to a higher level in areas of high lattice expansion, e.g. near notches. If a limiting concentration has been met sudden component failure will occur.There does not exist any knowledge so far about the influence of specific microstructure constituents as e.g. ferrite, perlite, bainit or martensite on hydrogen induced cracking at conditions which other from that are constant. As these mirostructures are adjusted specifically to increase the strength, this knowledge however would be relevant for a safe usage of high-strength steels.Previous projectwas able to prove the increasing concentration of hydrogen in areas of high stress. The analysis of local hydrogen showed evidence of different behavior of various structure modifications. As we see high potential for successful research we decided not to propose a third year of support but to propose this new application.The aim of the project is to characterize single structure parts of stressed high-strength multi-phase steels concerning their critical hydrogen concentration and to evaluate their impact on the tendency to hydrogen-induced cracking of a steel. The obtained insights finally are supposed to significantly promote further development of high-strength steels with controlled hydrogen-induced cracking.

汽车车身和动力装置工程技术质量标准的提高导致高强度钢的使用增加。由于这些钢材的使用，它是可能的，例如在汽车车身结构，以减轻重量，从而减少燃料消耗。然而，操作条件必须适应这些新的要求。随着强度的增加，对氢致开裂的敏感性也增加。众所周知，即使是少量的氢也会导致损伤。这种氢在高晶格膨胀的区域集中到更高的水平，例如在缺口附近。如果达到了极限浓度，就会发生突然的部件故障。到目前为止，还没有任何关于特定组织成分的知识，如铁素体、珍珠岩、贝氏体或马氏体在其他恒定条件下对氢致开裂的影响。由于这些微观结构被专门调整以增加强度，然而，这些知识将与高强度钢的安全使用相关。先前的项目能够证明在高应力区域氢气浓度的增加。对局部氢的分析表明了不同结构修饰的不同行为。由于我们看到了成功研究的巨大潜力，我们决定不再提供第三年的支持，而是提出这个新的应用程序。该项目的目的是表征应力高强度多相钢的单一结构部件的临界氢浓度，并评估它们对钢的氢致开裂倾向的影响。最终获得的见解有望显著促进具有可控氢致开裂的高强度钢的进一步发展。