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首页> 外文期刊>Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science >Correlation of Crack-Tip Opening Angle for Stable Crack Propagation with Charpy and Drop-Weight Tear Test Properties in High-Toughness API X70 Pipeline steels
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Correlation of Crack-Tip Opening Angle for Stable Crack Propagation with Charpy and Drop-Weight Tear Test Properties in High-Toughness API X70 Pipeline steels

机译：高韧性API X70管线钢中稳定裂纹扩展的裂纹尖端开口角度与夏比和落锤撕裂试验性能的关系

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摘要

Correlation between Charpy V-notch (CVN) impact properties, drop-weight tear test (DWTT) prop-erties, and crack-tip opening angles for stable crack propagation (CTOA_(sc) ) in high-toughness API X70 pipeline steels was investigated in this study. Two-specimen CTOA test (TSCT) was conducted on the rolled steel materials to measure the CTOA_(sc), and the test results were compared to the CVN and DWTT data to find correlations between them. The CVN total energy density showed an almost 1:1 linear correlation with the DWTT initiation energy density. The TSCT results indicated that the materials rolled in the single-phase region had the larger CTOA_(sc) as well as the higher CVN and DWTT energy density than those rolled in the two-phase region because their microstructures were composed of acicular ferrites and fine polygonal ferrites. The CTOA_(sc) had a better correlation with the DWTT propagation energy density or the CVN total energy density than the DWTT total energy density. In particular, the value of sin (2CT0A-(sc) ) reliably represented a linear proportional relation to the DWTT propagation energy density.
机译：研究了夏比V型缺口（CVN）冲击性能，落锤撕裂试验（DWTT）属性和高韧性API X70管线钢中稳定裂纹扩展的裂纹尖端张开角（CTOA_（sc））的相关性。在这个研究中。对轧制钢材进行了两个试样的CTOA测试（TSCT），以测量CTOA_（sc），并将测试结果与CVN和DWTT数据进行比较，以找出它们之间的相关性。 CVN总能量密度与DWTT起始能量密度显示出几乎1：1的线性关系。 TSCT结果表明，在单相区轧制的材料比在两相区轧制的材料具有更大的CTOA_（sc）以及更高的CVN和DWTT能量密度，因为它们的微观结构是由针状铁素体和细小的铁素体组成。多边形铁氧体。与DWTT总能量密度相比，CTOA_（sc）与DWTT传播能量密度或CVN总能量密度具有更好的相关性。特别地，sin的值（2CT0A-（sc））可靠地表示了与DWTT传播能量密度的线性比例关系。

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