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Static Crack Resistance of Heat-Resistant KhN43MBTYu Nickel-Chromium Alloy in Gaseous Hydrogen
Strength of Materials ( IF 0.7 ) Pub Date : 2020-08-18 , DOI: 10.1007/s11223-020-00189-4
O. I. Balyts’kyi , L. M. Ivas’kevych , J. J. Eliasz

The effect of hydrogen at a pressure of up to 35 MPa and a content of up to 29 ppm on the strength, ductility, short-term and long-term static crack resistance of four KhN43MBTYu (EP-915VD) alloy modifications with different heat treatment modes and chemical composition has been studied. It has been found that the critical stress intensity factor KIc in the presence of hydrogen, just as the ductility characteristics of smooth specimens, depends on the deformation rate, reaching minimum values at rates of less than 0.1 mm/min. The fracture toughness decreases under the action of hydrogen by a factor of 2.5, and the plane strain state occurs at a much smaller specimen thickness. An optimal combination of high strength, ductility, short- and long-term static crack resistance in air and hydrogen has been achieved in a fine-grained alloy with low carbon and sulfur content. Based on the results of long-term static crack resistance tests at the predetermined maximum fatigue test duration of 300 h, the invariant characteristics of crack resistance, the threshold values of stress intensity factor in hydrogen, have been determined, which vary from 23 to 48 MPa ∙ m1 / 2 depending on the alloy heat treatment mode.

中文翻译:

气态氢中耐热KhN43MBTYu镍铬合金的静态抗裂性

氢气在高达35 MPa的压力和高达29 ppm的含量下对四种热处理不同的KhN43MBTYu(EP-915VD)合金变体的强度,延展性,短期和长期静态抗裂性的影响模式和化学成分已被研究。已经发现临界应力强度因子K I c如同光滑试样的延展性一样,在氢气存在下,试样的变形速率也取决于变形速率,在小于0.1 mm / min的速率下达到最小值。在氢气的作用下,断裂韧性降低了2.5倍,并且在较小的试样厚度下出现了平面应变状态。在低碳和低硫含量的细晶粒合金中,已经实现了高强度,延展性,在空气和氢气中的短期和长期静态抗裂性的最佳组合。根据在300小时的预定最大疲劳测试持续时间下的长期静态抗裂性测试结果,确定了抗裂性的不变特性,即氢中的应力强度因子的阈值,范围从23到48不等。 MPa∙m 1/2 取决于合金的热处理方式。
更新日期:2020-08-18
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