0.1MPa水素ガスパイプライン用炭素鋼SGP (0.078C-0.012 Si-0.35Mn, mass%) の引張特性に及ぼす水素と予ひずみの影響
0.1MPa水素ガスパイプライン用炭素鋼SGP (0.078C-0.012 Si-0.35Mn, mass%) の引張特性に及ぼす水素と予ひずみの影響
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氢气和预应变对0.1 MPa氢气管道用碳钢SGP（0.078C-0.012 Si-0.35Mn，mass%）拉伸性能的影响
DOI：
10.1299/kikaia.74.1164
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
敬宜 村上
中科院分区：
文献类型：
--
作者：
尚樹 松尾;紳浩 本間;三郎 松岡;敬宜 村上
研究了氢和预应变对低碳钢板 JIS-SGP (0.078 C-0.012 Si-0.35 Mn) 拉伸性能的影响。钢制燃气管道材料JIS-SGP是氢气管道候选材料之一，由低碳钢板通过塑性加工和焊接制成。为了充氢，将由低碳钢板加工而成的用于拉伸试验和氢含量测量的原始样品以及 10% 和 20% 预应变样品在 313 K 下浸入 20 质量% 硫氰酸铵水溶液中 48 小时。预应变后通过充氢使氢含量增加。热解吸光谱显示，原始充氢样品的扩散氢含量为 0.38 ppm，10% 和 20% 预应变充氢样品的扩散氢含量分别为 0.43 和 0.71 ppm。面积的减少不受不带电样品中预应变的影响，但受到充氢样品中预应变的影响。充氢样品中的面积减少量低于未充氢样品中的面积减少量。充氢样品在拉伸试验后的残余扩散氢含量在0.38至0.71 ppm之间。随着充氢样品中氢含量的增加，面积减少呈线性下降。扫描电子显微镜显示，未充电和充氢的样品均发生杯锥断裂，且断裂表面被韧窝覆盖。在不带电的样品中，凹坑的直径小且深，而在充氢的样品中，凹坑又大又浅。拉伸断裂试样的纵截面上观察到许多空洞。在不带电的样品中，空隙沿着拉伸轴拉长。另一方面，在充氢样品中，空隙在垂直于拉伸轴的方向上被拉长。可以得出结论，氢增强了赤道平面处空隙边缘前方的滑移变形，并在垂直于拉伸轴的方向上产生平坦的椭球体空隙。为了了解氢脆的基本机制，应注意充氢样品中形成凹痕和空隙的独特机制。
The effects of hydrogen and prestrain on the tensile properties of a low carbon steel plate JIS-SGP (0.078 C-0.012 Si-0.35 Mn) were investigated. The steel gas pipeline material JIS-SGP, which is one of candidates for hydrogen gas pipelines, is produced from the low carbon steel plate by plastic working and welding. In order to charge hydrogen, the virgin, and 10 and 20% prestrained specimens for tensile tests and hydrogen content measurements, machined from the low carbon steel plates, were immersed in a 20 mass% aqueous solution of ammonium thiocyanate at 313 K for 48 h. The hydrogen content increased by hydrogen charge after prestraining. Thermal desorption spectroscopy showed that the diffusible hydrogen contents are 0.38 ppm for the virgin hydrogen charged specimen, and 0.43 and 0.71 ppm for the 10 and 20% prestrained hydrogen charged specimens, respectively. The reduction of area was not affected by prestraining in the uncharged specimens, but it was affected by prestraining in the hydrogen charged specimens. The reduction of area was lower in the hydrogen charged specimens than in the uncharged specimens. The residual diffusible hydrogen contents after tensile test in the hydrogen charged specimens were between 0.38 and 0.71 ppm. The reduction of area decreased linearly with increasing hydrogen content in the hydrogen charged specimens. Scanning electron microscopy showed that cup-and-cone fracture occurred in both the uncharged and hydrogen charged specimens, and that the fracture surfaces were covered by dimples. Dimples were small in diameter and deep in the uncharged specimens, while they were large and shallow in the hydrogen charged specimens. Many voids were observed on the longitudinal section of tensile fracture specimen. The voids were elongated along the tensile axis in the uncharged specimens. On the other hand, the voids were elongated in the direction perpendicular to the tensile axis in the hydrogen charged specimens. It can be concluded that hydrogen enhanced slip deformation ahead of the void edge at the equatorial plane and results in a flat ellipsoidal void in the direction perpendicular to the tensile axis. This unique mechanism of development of dimples and voids in the hydrogen charged specimens should be noted to understand the basic mechanism of hydrogen embrittlement.
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DOI：
--
发表时间：
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期刊：
日本金属学会誌 70-12
影响因子：
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DOI：
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发表时间：
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期刊：
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影响因子：
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作者：
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