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Outline
Taking the 23Cr2Ni4MoV steel forging as the research object，long‑term hydrogen charging tests were conducted at room temperature under different hydrogen pressures.The hydrogen concentration in the test steel was measured using the thermal desorption method，its hydrogen trap types and binding energies were analyzed，and its resistance to hydrogen‑induced cracking was evaluated using modified wedge open loading（WOL） specimens.The results show that under a room temperature，35 MPa hydrogen environment，hydrogen penetration into the 23Cr2Ni4MoV steel forging is difficult；when the pressure is increased to 70 MPa，the hydrogen permeation amount is approximately 3.41×10-6；further increasing to 110 MPa，the hydrogen permeation amount increases to 4.45×10-6.Thermal desorption analysis reveals that three types of hydrogen traps exist in the test steel，with binding energies of 10.24，19.93，59.88 kJ/mol in ascending order.The hydrogen that penetrates under the room‑temperature high‑pressure hydrogen environment is mainly captured by the shallow traps with a binding energy of 10.24 kJ/mol.Under a room temperature，110 MPa hydrogen environment，the hydrogen‑induced cracking stress intensity factor threshold value of the material is relatively low；when the applied stress intensity factor exceeds 58 MPa·m1/2，the WOL specimens all exhibit significant cracking.Based on a comprehensive assessment，the 23Cr2Ni4MoV steel forging is not suitable for use as a forging for ultra‑high‑pressure hydrogen storage vessels.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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