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随着宇航、石油化工、海洋开发、电力工业的发展,人们对材料的强度要求愈来愈高。在应用高强度材料过程中,常发生低于许用应力下的低应力脆断,特别是在腐蚀和应力共存时,易发生应力腐蚀断裂。这通常是在没有明显迹象下突然发生的。所以,对于高强度钢除考虑常规的力学性能指标外,还要求提供材料在相应介质中的应力腐蚀指标。
With the development of aerospace, petrochemical industry, marine development and electric power industry, the strength of materials is getting higher and higher. In the application of high strength materials, often occur below the allowable stress of low stress brittle fracture, especially in the coexistence of corrosion and stress, prone to stress corrosion cracking. This usually happens suddenly without obvious signs. Therefore, in addition to considering the conventional high-strength steel mechanical properties, but also requires the material provided in the corresponding medium stress corrosion index.