Straining-temperature dependence of vacancy behavior in hydrogen-charged austenitic stainless steel 316L

Straining-temperature dependence of vacancy behavior in hydrogen-charged austenitic stainless steel 316L
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充氢奥氏体不锈钢 316L 中空位行为的应变-温度依赖性

DOI:
10.1016/j.ijhydene.2020.11.148
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发表时间:
2021
影响因子:
7.2
通讯作者:
Chiari Luca
Chiari Luca
中科院分区:
工程技术2区
文献类型:
--
作者:
Komatsu Akari;Fujinami Masanori;Hatano Masaharu;Matsumoto Kazuhisa;Sugeoi Mitsuki;Chiari Luca

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研究了高γ相稳定性奥氏体不锈钢316L在氢环境中的空位行为,以阐明氢脆的临界缺陷。通过高压气体法在试样中引入氢气,并在可变的低温下进行拉伸应变。应变分布和空位缺陷的表征进行了SEM-KAM和低温正电子湮没寿命谱测量,分别。在低温(<-70 °C)下应变时,局部诱导高应变区域,其中高浓度的空位积累。这些空位聚集成大的团簇,被认为发展成导致裂纹的较大空隙的胚胎。这些结果表明,在高应变区氢致空位的局部形成是奥氏体不锈钢316L氢脆的决定因素。
The vacancy behavior in austenitic stainless steel 316L with highγ-phase stability in a hydrogen environment was investigated to clarify the critical defects of hydrogen embrittlement. Hydrogen was introduced in the samples by the high-pressure gas method and tensile straining was conducted at variable low temperatures. Characterization of the strain distribution and vacancy defects was performed by SEM-KAM and low-temperature positron annihilation lifetime spectroscopy measurements, respectively. Upon straining at low temperatures (<-70 °C), high-strain regions were induced locally where a high concentration of vacancies accumulated. These vacancies agglomerated into large clusters that are thought to develop into the embryos of larger voids leading to cracks. These results show that the local formation of hydrogen-induced vacancies in high-strain regions is the determining factor of hydrogen embrittlement in austenitic stainless steel 316L.
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发表时间: 2006
期刊: Zairyo-to-kankyo
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