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研究了OOCr13Ni6MoNb和OOCr14Ni6MoTi马氏体时效不锈钢在高温固溶后缓冷、中间等温退火及随后时效等不同热处理制度下的力学性能、显微组织和断裂行为。试验结果表明:在高温缓冷过程中由于Nb(C,N)、Ti(C,N)质点沿原奥氏体晶界析出导致材料以沿晶方式断裂,但由于合金元素的影响,两种钢沿晶断裂程度有所差异,在时效过程中,η、δ等时效相的弥散析出是OOCr14Ni6MoTi钢发生准解理断裂的主要原因,微孪晶的存在对准解理断裂不起重要作用。讨论了合金元素、显微组织、断裂机制之间的关系,并提出了消除热脆性、提高合金韧性的方法。
The mechanical properties, microstructure and fracture behavior of OOCr13Ni6MoNb and OOCr14Ni6MoTi martensitic stainless steels were studied under different heat treatments, including slow cooling, intermediate isothermal annealing and subsequent aging. The results show that the precipitates along the original austenite grain boundary cause the material to fracture by the intergranular precipitation during the process of high temperature slow cooling. However, due to the influence of alloying elements, two During the aging process, the dispersion of η, δ and other aging phases is the main cause of quasi-cleavage fracture of OOCr14Ni6MoTi steel. The existence of micro-twins does not play an important role in the cleavage of cleavage. The relationship between alloying elements, microstructure and fracture mechanism was discussed. A method to eliminate hot brittleness and improve the toughness of the alloy was proposed.