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Fracture toughness of hydrogen charged as-quenched ultra-high-strength steels at low temperatures

机译：氢淬冷超高强度钢的断裂韧性

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摘要

The effect of hydrogen on the fracture and impact toughness of ultra-high-strength steels at sub-zero temperatures in the transition temperature region has been investigated with arctic applications in mind. Two types of as-quenched microstructure were studied, i.e. autotempered martensite and a mixture of martensite and bainite, both having yield strengths close to 1000 MPa. These were charged with hydrogen using passive cathodic protection and then tested in both the charged and uncharged condition at sub-zero temperatures. Hydrogen contents were measured with melt-extraction. Fractography, kernel average misor-ientation measurements and cohesive zone modelling were used to analyse the results considering the degree and the active mechanisms of hydrogen embrittlement. It is shown that hydrogen embrittlement is present at sub-zero temperatures, causing an increase in fracture toughness reference temperature T_0 and a small decrease in deformation capability. The relationship between the T_0 and the impact toughness transition temperature T_(28J), which, in the case of ultra-high-strength steel, deviates from that observed for lower strength steels, is proposed to be affected by the hydrogen content.
机译：考虑到北极的应用，研究了氢对转变温度范围内低于零温度的超高强度钢的断裂和冲击韧性的影响。研究了两种淬火后的显微组织，即自回火马氏体以及马氏体和贝氏体的混合物，两者都具有接近1000 MPa的屈服强度。使用被动阴极保护为这些电池充氢，然后在零以下温度下的带电和不带电条件下进行测试。氢含量通过熔体萃取进行测量。考虑到氢脆的程度和活性机理，使用分形术，核平均取向差测量和内聚区建模来分析结果。结果表明，在低于零的温度下存在氢脆，导致断裂韧性参考温度T_0增加并且变形能力略有下降。 T_0和冲击韧性转变温度T_（28J）之间的关系（在超高强度钢的情况下，与低强度钢的情况不同）被认为受氢含量的影响。

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