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首页> 外文期刊>Engineering Fracture Mechanics >Estimating fracture toughness of various matrix structured ductile iron using circumferentially notched tensile bars
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Estimating fracture toughness of various matrix structured ductile iron using circumferentially notched tensile bars

机译：使用圆周缺口拉伸棒估计各种基质结构延性铁的断裂韧性

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摘要

In this experimental study, circumferentially notched tensile (CNT) specimens with various notch root radii of 0.05, 0.1, 0.16, 0.25, 0.4, and 0.8 mm were employed to investigate the influence of matrix structure on the fracture toughness of 1.03% Cu, 1.25% Ni, and 0.18% Mo alloyed ductile iron. The assayed matrix structures in this study were ferritic, pearlitic/ferritic, pearlitic, tempered martensitic, lower and upper ausferritic. The microstructures were obtained by several heat treatment processes. The microstructures and morphology of broken surfaces of CNT specimens were also examined by the optical and scanning electron microscopes. It was observed that for the steady-phased (ferritic, pearlitic/ferritic, and pearlitic) matrixes, the increasing rates of fracture toughness under the applications of different notch tip radii were lower than that of the tempered martensitic, lower and upper ausferritic matrixes. It was also inferred that lower values of fracture toughness were obtained by the applied rapid method.
机译：在该实验研究中，采用周向的拉伸拉伸（CNT）标本0.05,0.1,0.16,0.25,0.2和0.8mm的各种缺口根半径，研究基质结构对1.03％Cu，1.25的裂缝韧性的影响。 ％Ni，0.18％Mo合金延性铁。本研究中的测定基质结构是铁素体，珠光体/铁素体，珠光体，钢化马氏体，下部和上部空心菌。通过几种热处理方法获得微观结构。光学和扫描电子显微镜检查CNT样本破碎表面的微观结构和形态。观察到，对于稳定相位（铁素体，珠光体/铁素体和珠光体）基质，在不同凹口尖端半径的应用下的裂缝韧性的增加率低于钢化马氏体，下和上令极性素基质的裂缝韧性。还推断，通过施加的快速方法获得较低的断裂韧性值。

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