Effect of microstructure on charpy impact properties and LBB assessment of SCM435 steel for storage cylinders of 35MPa hydrogen stations
Effect of microstructure on charpy impact properties and LBB assessment of SCM435 steel for storage cylinders of 35MPa hydrogen stations
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35MPa加氢站储气瓶用SCM435钢显微组织对简支梁冲击性能的影响及LBB评定
DOI：
10.2472/jsms.59.924
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
Y. Murakami
中科院分区：
文献类型：
--
作者：
T. Matsuo;J. Yamabe;Y. Fukushima;S. Matsuoka;Y. Murakami
研究了氢对调质低合金钢SCM435s的拉伸和夏比冲击性能的影响。将拉伸和夏比冲击试件暴露在100 MPa和85°C的氢气中后，在室温下以1 mm/min的十字头速度在空气中进行拉伸试验，并在-100℃和100°C的空气中进行夏比冲击试验。用热脱附分析法(TDA)测定了样品的残氢含量。残余氢含量在0.29~0.44质量ppm范围内的氢暴露试件的抗拉强度与未暴露试件基本相同，而试件的面积缩小率比未暴露试件低约10%。氢暴露试件的夏比冲击性能与未暴露试件基本一致。用电子背散射衍射仪(EBSD)观察了材料的微观结构。EBSD分析表明，马氏体块晶尺寸越小，断口转变温度越低。随着块体颗粒尺寸的减小，上陆架吸收的能量增加。根据上搁板吸收的能量估算出材料的断裂韧度值，并对35 Mpa储氢钢瓶进行了断裂前泄漏(LBB)评价。
Influence of hydrogen on tensile and Charpy impact properties of quench-tempered low-alloy steels, SCM435s for four types of storage cylinders in 35MPa hydrogen stations, was investigated. After tensile and Charpy impact specimens were exposed to hydrogen gas at 100MPa and 85°C, tensile tests were conducted at room temperature in air under a cross-head speed of 1mm/min, and Charpy impact tests were conducted at temperatures from -100 and 100°C in air. Residual hydrogen contents of these specimens were also measured by TDA (Thermal Desorption Analysis). The tensile strength of hydrogen-exposed specimens, whose residual hydrogen contents ranged from 0.29 to 0.44 mass ppm, were nearly equal to that of unexposed specimens, while the reduction of area of hydrogen-exposed specimens were about 10% lower than that of unexposed specimens. The Charpy impact properties of hydrogen-exposed specimens were consistent with those of unexposed specimens. Microstructures of these materials were observed by EBSD (Electron Back Scatter Diffraction). EBSD analysis clarified that the fracture appearance transition temperature became lower, when the block grain size of martensite became smaller. The upper-shelf absorbed energy increased with decreasing the block grain size. Fracture thoughness values of the materials were estimated from the upper-shelf absorbed energy ; then, evaluation of LBB (Leak-before-break) of 35MPa hydrogen storage cylinders was conducted.
氢对900 MPa级低合金钢SCM435拉伸性能的影响
DOI：
--
发表时间：
2006
期刊：
日本金属学会誌 70-12
影响因子：
--
作者：
松岡三郎;本間紳浩;田中裕之;福島良博;村上敬宜
通讯作者：
村上敬宜