...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Corrosion >Formation of Cavities Prior to Crack Initiation and Growth on Cold-Worked Carbon Steel in High-Temperature Water
【24h】

Formation of Cavities Prior to Crack Initiation and Growth on Cold-Worked Carbon Steel in High-Temperature Water

机译：高温水中冷作碳钢在裂纹萌生和扩展之前的空洞形成

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The rate of growth of stress corrosion cracking (SCC) was measured for cold-worked carbon steel (ASTM A106 [UNS K03006]) in hydrogenated pure water under static load condition. Four important patterns were observed. First, intergranular stress corrosion cracking (IGSCC) was observed even in the static load condition in case that material was cold-worked. Second, to assess the role of creep, rates of creep crack growth were measured in air, argon, and hydrogen gas environments using cold-worked carbon steel in the range of temperatures between 270° C and 475° C: intergranular creep cracking was observed in gas environments. Similar 1/T temperature dependencies for IGSCC and intergranular creep crack growth were observed for cold-worked carbon steel. Similar fracture morphologies and 1/T dependencies suggest that creep is important in the growth of IGSCC of cold-worked carbon steel in high-temperature water. Third, cavities were recognized at the grain boundaries on the periphery of both the SCC and creep crack tips. The cavities seem to play a role as crack embryos before cracks advance. Fourth, the initiation of cracks was examined on cold-worked carbon steel in water and in air at 360° C using specimens of blunt-notched compact tension-type specimen. Cavities were observed at grain boundaries after 8,082 h exposure in water and 8,033 h exposure in air at the bottom of the notch before crack initiation. Cavities observed in specimens exposed to pure water were more numerous than that in air at the same temperature and time of exposure. This result suggests that diffusion and condensation of vacancies in high stress fields occurs during the incubation period in high-temperature water. Finally, to assess the mechanism of IGSCC initiation and growth in high-temperature water, the diffusion of vacancies driven by stress gradients was studied using a specially designed CT specimen. As a model for IGSCC in cold-worked materials in high-temperature water, the formation of cavities from the collapse of vacancies seems to be the best interpretation of the present data. [PUBLICATION ABSTRACT]
机译：在静态载荷条件下，在氢化纯水中测量了冷加工碳钢（ASTM A106 [UNS K03006]）的应力腐蚀开裂（SCC）的生长速率。观察到四个重要模式。首先，即使在静态负载条件下对材料进行冷加工，也观察到晶间应力腐蚀开裂（IGSCC）。其次，为评估蠕变的作用，在270°C至475°C的温度范围内，使用冷加工碳钢在空气，氩气和氢气环境中测量了蠕变裂纹扩展的速率：观察到晶间蠕变裂纹在气体环境中。对于冷加工碳钢，IGSCC和晶间蠕变裂纹扩展具有相似的1 / T温度依赖性。类似的断裂形态和1 / T相关性表明，蠕变对于高温水中冷加工碳钢的IGSCC的生长很重要。第三，在SCC和蠕变裂纹尖端的外围的晶界处识别出空洞。在裂纹发展之前，空洞似乎起着裂纹胚的作用。第四，使用钝口致密的紧凑型拉伸试样在冷加工碳钢在360°C的水中和空气中检查裂纹的产生。裂纹开始前，在凹口底部的水中暴露8082小时和暴露在空气中8033小时后，在晶界处观察到空洞。在相同温度和暴露时间下，暴露于纯水的样品中观察到的空腔要比空气中的空腔多。该结果表明，在高温水中的潜伏期中，空位在高应力场中扩散和凝结。最后，为评估IGSCC在高温水中引发和生长的机理，使用专门设计的CT样品研究了应力梯度驱动的空位扩散。作为高温水中冷加工材料中IGSCC的模型，空位崩溃形成的空洞似乎是对当前数据的最佳解释。 [出版物摘要]

著录项

  • 来源
    《Corrosion》 |2010年第1期|p.1-14|共14页
  • 作者

    K Arioka T Miyamoto T Yamada T Terachi;

  • 作者单位

    K. Arioka,[double dagger],* T. Miyamoto,** T. Yamada,* and T. Terachi*Submitted for publication May 2009, in revised form, September 2009.[double dagger] Corresponding author. E-mail: arioka@inss.co.Jp.* INSS, 64 Sata, Mihama-cho Mikata-gun, Fukui-Ken 919-205, Japan.** Kobe Material Testing Co., Ltd., Niijima, Harima-cho, Kako-gun, Hyogo, 675-0155, Japan.,;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号