R. Cuamatzi-Meléndez, M. Salazar-Martínez, Fernando Juárez-López
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引用次数: 0
摘要
本研究对在 60°C 和 196°C 下进行的冲击夏比试验和四点双缺口弯曲试验中获得的样品断裂表面进行了测量。这是为了量化劈裂面错位对劈裂断口扩展阻力的影响。用于分析的材料是铁素体 A 级船板钢。通过测量单个劈裂面相对于其相邻劈裂面的取向来量化晶粒的错位角,并测量多个劈裂面的错位角。将裂隙面的错误取向角分为四组进行分析:所有裂隙面、小-小裂隙面、小-大裂隙面和大-大裂隙面,以确定这种分类如何影响裂隙面的错误取向角。结果表明,相邻晶粒间的高错取向角可作为劈裂扩展的障碍,并为脆性断裂扩展提供更多阻力,或在铁素体钢的韧性-脆性转变过程中阻止潜在的临界尺寸微裂纹。因此,分析表明,当断裂路径在 A 级船板钢的下层发现高取向错位晶粒时,微裂纹会被阻止。本研究还讨论了铁素体晶粒的取向错位对断裂扩展的影响。关键词劈裂断裂、偏斜角、夏比试验、四点双缺口弯曲试验、劈裂面。
Misorientation Angle Study on Cleavage Fracture Propagation Surfaces of a Grade a Ship Steel, through Charpy and Four-Point Double-Notch Bend Tests
Measurements over fractured surfaces of samples obtained from impact Charpy tests and four-point double-notch bend tests, carried out at-60°C and-196°C were performed in the present work. This in order to quantify cleavage facets misorientation for the resistance of cleavage fracture propagation. The material used for the analyses was a ferritic Grade A ship plate steel. The grains misorientation angle was quantified by measuring the orientation of single cleavage facets with respect to its neighbors, of a number of cleavage facets, and the misorientation angle was measured. The misorientation angle of cleavage facets was analyze in four groups: all facets, small-small, small-large and large-large facets in order to identify how this classification can affect the misorientation angle of cleavage facets. The results showed that high misorientation angles between neighboring grains, can act as barriers for cleavage propagation, and offer more resistance for brittle fracture propagation or may arrest potential microcracks of critical size in the ductile-brittle transition of ferritic steels. Therefore, the analysis revealed arrest of microcracks when the fracture path found high misoriented grains in the lower shelf of a Grade A ship plate steel. The effect of the misorientation of the ferrite grains in terms of the cleavage facets misorientation on fracture propagation was also discussed in the present work. Keywords: Cleavage fracture, Misorientation angle, Charpy tests, Four-point double-notch bend tests, Cleavage facets.