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首页> 美国卫生研究院文献>Scientific Reports >Effects of Mo addition on crack tip opening displacement (CTOD) in heat affected zones (HAZs) of high-strength low-alloy (HSLA) steels
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Effects of Mo addition on crack tip opening displacement (CTOD) in heat affected zones (HAZs) of high-strength low-alloy (HSLA) steels

机译：钼对高强度低合金（HSLA）钢热影响区（HAZs）的裂纹尖端开口位移（CTOD）的影响

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摘要

Effects of Mo addition on microstructures and crack tip opening displacement (CTOD) in heat affected zones (HAZs) of three high-strength low-alloy (HSLA) steels were investigated in this study, and the correlation between them was explained by fracture mechanisms related with martensite-austenite constituent (MA) characteristics. The coarse-grained HAZ (CGHAZ) consisted of acicular ferrite (AF), granular bainite (GB), and bainitic ferrite (BF), whereas the inter-critically heated HAZ (ICHAZ) consisted of quasi-polygonal ferrite (QPF), GB, and MA. Since Mo promoted the formation of GB, BF, and MA and prevented the formation of AF and QPF, the CTOD decreased in both HAZs with increasing Mo content. According to the interrupted three-point bending test results of the ICHAZ where many MAs were distributed in the QPF or GB matrix, many voids were observed mainly at MA/QPF interfaces, which implied that the void initiation at the interfaces was a major fracture mechanism. The atomic probe data of MAs indicated the segregation of C, Mn, Mo, and P at MA/QPF interfaces, which could result in the easy MA/matrix interfacial debonding to initiate voids. Thus, characteristics of MA/QPF interfaces might affect more importantly the CTOD than the MA volume fraction or size.
机译：研究了钼对三种高强度低合金（HSLA）钢热影响区（HAZs）的组织和裂纹尖端开口位移（CTOD）的影响，并通过相关的断裂机理解释了它们之间的相关性。具有马氏体-奥氏体成分（MA）的特征。粗晶粒热影响区（CGHAZ）由针状铁素体（AF），颗粒贝氏体（GB）和贝氏体铁素体（BF）组成，而临界间加热热影响区（ICHAZ）由准多边形铁素体（QPF），GB和MA。由于Mo促进了GB，BF和MA的形成，并阻止了AF和QPF的形成，因此，随着Mo含量的增加，两种热影响区的CTOD均降低。根据ICHAZ的中断三点弯曲测试结果，其中许多MA分布在QPF或GB矩阵中，主要在MA / QPF界面处观察到许多空隙，这表明界面处的空隙引发是主要的断裂机制。 。 MAs的原子探测数据表明，MA / QPF界面处的C，Mn，Mo和P偏析，这可能导致MA /矩阵界面容易剥离而引发空隙。因此，MA / QPF接口的特性可能比MA体积分数或大小更重要地影响CTOD。

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