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首页> 外文期刊>Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science >Crack-Initiation Toughness and Crack-Arrest Toughness in Advanced 9 Pct Ni Steel Welds Containing Local Brittle Zones
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Crack-Initiation Toughness and Crack-Arrest Toughness in Advanced 9 Pct Ni Steel Welds Containing Local Brittle Zones

机译：包含局部脆性区的高级9 Pct镍钢焊缝的裂纹萌生韧性和阻滞韧性

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摘要

The present study investigates the influence of local brittle zones (LBZs) on the fracture resistance of the heat-affected zones (HAZs) in quenched. lamellarized, and tempered (QLT) 9 pct Ni steel weld joints. The results of Charpy impact tests using simulated coarse-grained, heat-affected zone (CGHAZ) specimens show that the intercritically reheated (IC) CGHAZ and unaltered (UA) CGHAZ are the primary and secondary LBZs, respectively, of the steel at cryogenic temperature. Compact crack arrest (CCA) tests and crack-tip opening displacement (CTOD) tests were conducted at a liquefied natural gas (LNG) temperature to measure the variations in crack-arrest toughness and crack-initiation toughness along the distance from the fusion line (FL) within the actual HAZ. While CTOD tests show a decrease in toughness when approaching the FL, i.e., the regions containing LBZs, the crack-arrest-toughness values are found to be higher than those in the regions near the base materials. This is due to the fact that the crack-arrest toughness is governed by the fraction of microstructures surrounding LBZs instead of the LBZs themselves. By direct comparison of the brittle-crack-arrest toughness (K_a) with the brittle-crack-initiation toughness (K_c), this investigation has determined that, with regard to crack-arrest behavior, the LBZs of QLT-9 pct Ni steel do not limit the practical safety performance of the weld joints in LNG storage tanks.
机译：本研究调查了局部脆性区（LBZs）对淬火后热影响区（HAZs）的抗断裂性能的影响。层状和回火（QLT）9 pct镍钢焊接接头。使用模拟的粗粒热影响区（CGHAZ）样品进行的夏比冲击试验的结果表明，在低温下，临界再热（IC）CGHAZ和未改变（UA）CGHAZ分别是钢的主要和次要LBZ。 。在液化天然气（LNG）温度下进行了紧凑型裂纹止裂（CCA）测试和裂纹尖端开口位移（CTOD）测试，以测量沿距熔合线的距离的裂纹保持韧度和裂纹起始韧度的变化（ FL）在实际的危险区域内。 CTOD试验表明，当接近FL时，即含有LBZs的区域，韧性降低了，但发现裂纹-断裂-韧性值高于基材附近的那些。这是由于这样的事实，即抗裂纹韧性是由围绕LBZ的微结构的比例而不是LBZ本身所决定的。通过直接比较脆裂-裂纹韧性（K_a）和脆裂-起始韧性（K_c），这项研究已经确定，就裂纹阻止行为而言，QLT-9 pct Ni钢的LBZ确实不限制液化天然气储罐焊接接头的实际安全性能。

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