The laws governing the influence of a hydrogen atmosphere at a pressure of up to 15 MPa with controlled total oxygen and water vapor content of up to 0.004 g/m³ and pre-absorbed hydrogen on the strength and ductility characteristics, short-term and long-term static crack resistance of 05Kh13N8M3 cast martensitic steel (in wt.%: 0.045 C, 0.38 Si, 12.9 Cr, 2.69 Mo, 0.43 Mn, 7.8 Ni, 0.057 La) at room temperature were studied. After hydrogen pre-charging for 4 h at a temperature of 773 K and a pressure of 5, 10, and 15 MPa, the hydrogen content of the specimens determined with a LECO TCH 600 device by infrared adsorption with melting was 3.3, 4.9, and 7.6 ppm, respectively. It was found that under short-term loading, the intensity of the effect of hydrogen on the fracture toughness of steel increases with an increase in the absorbed hydrogen content, crack sharpness, and a decrease in the loading rate. At the maximum hydrogen concentration of 7.6 ppm and a tensile rate of 0.1 mm/min, the relative elongation, lateral contraction ratio of smooth 25 mm long cylindrical specimens with a test portion diameter of 5 mm and the critical stress intensity factor of beam specimens measuring 20×10×100 mm with a relative length of the pre-induced crack of \(\upvarepsilon =\) 0.53 decrease almost twofold. At the same concentration, hydrogen does not affect the stress intensity factor of cracked specimens at a rate of 10 mm/min and specimens with a stress concentrator in the form of a notch with a tip radius of 0.065 mm at a rate of 0.1 mm/min. Under long-term static loading with a test duration of 300 h of double-cantilever beam specimens in the form of a rectangular plate 10 mm thick with milled grooves 3 mm deep and a tip angle of 60°, the threshold value of the stress intensity factor decreases. The rate of subcritical crack growth in the second portion of the hydrogen cracking diagram increases in proportion to the logarithm of hydrogen concentration.

控制压力高达 15 MPa、控制总氧和水蒸气含量高达 0.004 g/m ³以及预吸收氢的氢气气氛对短期和长期强度和延展性特性的影响的定律研究了05Kh13N8M3铸造马氏体钢（重量%：0.045 C、0.38 Si、12.9 Cr、2.69 Mo、0.43 Mn、7.8 Ni、0.057 La）在室温下的长期静态抗裂性能。在773 K温度、5、10、15 MPa压力下预充氢4 h后，采用LECO TCH 600装置红外熔融吸附法测定试样氢含量分别为3.3、4.9和分别为 7.6 ppm。研究发现，在短期加载下，氢对钢断裂韧性的影响强度随着吸收氢含量的增加、裂纹锐利度的增加以及加载速率的降低而增加。在最大氢浓度7.6 ppm、拉伸速率0.1 mm/min下，测量试件直径为5 mm、长25 mm的光滑圆柱形试件的相对伸长率、横向收缩率以及梁试件的临界应力强度因子20×10×100 mm，预诱发裂纹的相对长度为\(\upvarepsilon =\) 0.53，几乎减少两倍。在相同浓度下，氢气对速率为 10 mm/min 的裂纹试样和速率为 0.1 mm/min 且尖端半径为 0.065 mm 的缺口形式的应力集中试样的应力强度因子没有影响。分钟。10mm厚、铣槽深3mm、顶角60°的矩形板双悬臂梁试件，在长期静载荷作用下，试验时间为300h，应力强度阈值因子减少。氢裂解图第二部分中的亚临界裂纹扩展速率与氢浓度的对数成比例增加。