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显微组织是影响材料氢脆敏感性的重要因素。本实验对30CrMnSi 钢进行不同制度的热处理后,获得各种贝氏体、索氏体、屈氏体和临界区亚温淬火组织。经过相同条件的阴极电解充氢后,测试氢对各试样机械性能的影响并观察其断口形貌的变化规律,探讨氢致断裂的微观机制,寻找抗氢脆能力最强的显微组织和热处理工艺。实验结果表明:30CrMnSi 铜的下贝氏体组织具有最小的氢脆敏感性。贝氐体组织试样的氢脆断口特征是准解理,而索氏体、屈氏体则主要是沿晶,本文认为影响氢脆敏感性的材料内部因素是:显微组织类型、位错密度、碳化物类型及分布、残留奥氏体含量等。
Microstructure is an important factor that affects the sensitivity of materials to hydrogen embrittlement. In this experiment, different bainite, sorbite, troostite and subcritical quenching microstructure of 30CrMnSi steel were obtained after heat treatment under different regimes. After the same conditions of the cathodic electrolysis of hydrogen, the hydrogen test on the mechanical properties of the sample and observe the changes in the morphology of the fracture, to explore the microscopic mechanism of hydrogen induced fracture, looking for the most resistant to hydrogen embrittlement microstructure and Heat treatment process. The experimental results show that the lower bainite of 30CrMnSi copper has the lowest hydrogen embrittlement susceptibility. The characteristics of hydrogen embrittlement fracture of shellfish body tissues are quasi-cleavage, while that of sorbitol and troostite is mainly along the grain. The internal factors of the material that affect the sensitivity of hydrogen embrittlement are: the type of microstructure, dislocation Density, carbide type and distribution, retained austenite content and so on.