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首页> 外文期刊>Fatigue & Fracture of Engineering Materials & Structures >Characterization of delayed cracking in deep-drawn Swift cups of metastable austenitic stainless steels
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Characterization of delayed cracking in deep-drawn Swift cups of metastable austenitic stainless steels

机译:亚稳奥氏体不锈钢深冲Swift杯中延迟开裂的特征

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Fracture behaviour of metastable austenitic stainless steels (Cr-Ni grade 301 and low-Ni high-Mn grades 201 and 204Cu) that suffer of delayed cracking after deep drawing was examined. The phenomenon of delayed cracking is known to be related to the coexistence of internal hydrogen, strain-induced α'-martensite and tensile residual stresses. The objective of this study was to maximize the information attainable from the common Swift cup test, which is used to evaluate the formability and delayed cracking susceptibility of sheet metals. Fractures in deep-drawn Swift cups were analysed macroscopically, by fracture surface study and electron backscatter diffraction analysis. Residual stresses in the cups were measured with X-ray diffraction and α'-martensite content using a Ferritescope. Estimation of fracture toughness of the materials was made using two different approaches: measuring the width of shear lips and relating it to the plastic zone size, and measuring the crack-tip opening angle CTOA. On the basis of the results, grade 301 presents the highest fracture toughness, and 204Cu the lowest. Toughness of the materials seems to correlate with their nickel content. The order between the studied materials is similar when considering the susceptibility to delayed cracking.
机译:研究了亚稳奥氏体不锈钢(Cr-Ni级301和低Ni高锰级201和204Cu)在深冲后延迟开裂的断裂行为。已知延迟龟裂现象与内部氢,应变诱导的α'马氏体和拉伸残余应力的共存有关。这项研究的目的是最大程度地利用常见的Swift杯测试获得的信息,该测试用于评估钣金的可成形性和延迟开裂敏感性。通过断裂表面研究和电子背散射衍射分析,对深冲Swift杯中的断裂进行了宏观分析。使用铁素体镜通过X射线衍射和α'-马氏体含量测量杯中的残余应力。使用两种不同的方法估算材料的断裂韧性:测量剪切唇的宽度并将其与塑性区大小相关联,以及测量裂纹尖端的开口角度CTOA。根据结果​​,等级301的断裂韧性最高,而等级204Cu的断裂韧性最低。材料的韧性似乎与其镍含量有关。考虑到延迟开裂的敏感性,研究材料之间的顺序相似。

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