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Dynamic notch fracture toughness.J_C~V assessment of functionally austenitic-martensitic graded steels

机译：动态缺口断裂韧性。功能奥氏体-马氏体梯度钢的J_C〜V评估

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摘要

Functionally graded steels are a group of functionally graded materials provide an arena so that the maximum possible benefits can be derived from composites including martensite and bainite brittle phases. These phases are created with gradual variation in strength within interface of plane carbon steel and austenitic stainless steel during the fabrication process. In the present research, a functionally austenitic-martensitic graded steel, consists of austenitic and martensitic phases was produced by means of electro slag remelting process and its mechanical behavior under impact loading conditions in the form of crack divider configuration was investigated. Empirical values of the notch fracture toughness J were carried out utilizing load-displacement curve which was recorded in Charpy impact test instrumented by Hopkinson pressure bar (HPB). J-integral is one of the fracture parameters in elastic-plastic fracture mechanics, which can be used to predict the fracture resistance in cracked and notched components. By correlating mean strain energy density criterion and J-integral, and applying the rule of phase mixtures, a mathematical model was developed to predict critical value of J-integral in functionally graded steels with crack divider configuration. Finally, a good compatibility between the experimental results of the dynamic notch fracture toughness and those obtained from the proposed model was observed.
机译：功能梯度钢是一组功能梯度材料，它们提供了广阔的舞台，因此可以从包括马氏体和贝氏体脆性相在内的复合材料中获得最大的收益。这些阶段是在制造过程中，平面碳钢和奥氏体不锈钢的界面强度逐渐变化而创建的。在本研究中，通过电渣重熔工艺生产了由奥氏体和马氏体相组成的功能性奥氏体-马氏体梯度钢，并研究了其在冲击载荷条件下以裂纹分隔物的形式出现的力学行为。缺口断裂韧性J的经验值是利用荷重-位移曲线进行的，该荷重-位移曲线记录在由霍普金森压力棒（HPB）测量的夏比冲击试验中。 J积分是弹塑性断裂力学中的断裂参数之一，可用于预测裂纹和缺口构件的断裂抗力。通过将平均应变能密度标准与J积分相关联，并应用相混合规则，建立了数学模型来预测具有裂纹分隔线构造的功能梯度钢中J积分的临界值。最后，观察到动态槽口断裂韧性的实验结果与从所提出的模型获得的结果之间具有良好的兼容性。

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