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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >Creep plastic zone and crack initiation in double edge notched specimens of 304 stainless steel at 650 ℃
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Creep plastic zone and crack initiation in double edge notched specimens of 304 stainless steel at 650 ℃

机译：650℃304不锈钢双边缺口试样的蠕变塑性区和裂纹萌生。

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Creep tests of 304 stainless steel using double edge notched specimens (6 mm thickness, 8 mm net width, 0.3 mm notch width, notch depth a = 0.5, 1 and 2 mm) were carried out in air at 650 ℃ at a net stress of 88 MPa till crack initiation on the notch root surface. Creep crack initiation time: the time when ～0.5 mm long crack is formed on the notch root surface, increased with increasing notch depth, i.e. from ～3200 h for a = 0.5 mm, to ～4000 h for a = 1 mm and to ～5000 h for a = 2 mm. The creep crack initiation site was the notch root of near mid-thickness for a = 2 mm, while it was the notch root of near surface thickness for a = 0.5 mm. Development of the creep plastic zone was observed by the subsequent recrystallization thermal etching technique using multiple specimens which were crept to various times up to crack initiation. It is shown that the difference of the crack initiation site is related whether creep plastic zone is subjected to gross yielding or not.
机译：在650℃的空气中，在650℃的空气中，使用双边缺口试样（6mm厚度，8mm净宽度，0.3mm缺口宽度，缺口深度a = 0.5,1和2mm）对304不锈钢进行蠕变试验。 88 MPa，直到切口根部表面开始产生裂纹。蠕变开裂开始时间：在槽口根部表面形成〜0.5 mm长裂纹的时间，随着开槽深度的增加而增加，即从a = 0.5 mm的〜3200 h，到a = 1 mm的〜4000 h到〜 5000 h for a = 2毫米蠕变裂纹的起始部位是a = 2 mm时，接近中厚的缺口根，而a = 0.5 mm是接近表面厚度时的缺口。通过随后的重结晶热蚀刻技术，使用多个样品蠕变塑性区的发展，这些样品在不同时间蠕变直至裂纹萌生。结果表明，裂纹起始点的不同与蠕变塑性区是否经历总屈服有关。

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