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本文对18Cr2Ni4WA钢萘状断口的宏观、微观特征:具有萘状断口试样的显微特征;以及重结晶处理和改锻试验对萘状断口的影响进行了研究。并基于实验结果,认为合金结构钢中存在着萘状断口、伪萘状断口两种情形。并提出了它们的形成机理及其重结晶处理后的转化规律(模型)。从而认为,应当采用两步宏观断口法检查合金结构钢的过热断口,才能准确地确定钢过热以及过热程度。试料与实验本试验用钢取自18Cr2Ni4WA钢A和B两炉,试样来源、化学成分、冶炼工艺以及脱氧方法等见资料。试样热处理制度是1400℃保温40分钟后在炉灰中缓慢冷却,由此取料在落锤下打开断口
In this paper, 18Cr2Ni4WA steel naphthalene fracture macroscopic and microscopic features: with naphthalene fracture specimens microscopic features; and recrystallization treatment and forging test on the naphthalene fractures were studied. Based on the experimental results, it is considered that there are two cases of naphthalene fracture and pseudo-naphthalene fracture in alloy steel. The mechanism of their formation and the transformation rules (model) after their recrystallization were proposed. Therefore, we should adopt the two-step macroscopic fracture method to check the overheat fracture of the alloy structural steel to accurately determine the overheating of the steel and the degree of overheating. Sample and experiment The test steel from the 18Cr2Ni4WA steel A and B two furnaces, the sample source, chemical composition, smelting process and deoxidation method see the information. Sample heat treatment system is 1400 ℃ insulation 40 minutes after the slow cooling in the ash, which draws open the fracture in the drop hammer