Visualization of hydrogen gas evolution during deformation and fracture in SCM440 steel with different tempering conditions
Visualization of hydrogen gas evolution during deformation and fracture in SCM440 steel with different tempering conditions
复制标题
不同回火条件下SCM440钢变形和断裂过程中氢气析出的可视化
DOI：
10.1016/j.msea.2011.11.098
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Hidetoshi Kobayashi
中科院分区：
文献类型：
--
作者：
Keitaro Horikawa;Nobuaki Ando;Wataru Urushihara;Hidetoshi Kobayashi
In the present study, the hydrogen gas evolution behavior was investigated in SCM 440 steel by using a hydrogen microprint technique (HMT) and a testing machine equipped with a quadrupole mass spectrometer (QMS) in a ultrahigh vacuum (UHV) atmosphere. SCM 440 steels prepared by varying the tempering temperature over the range 200–700°C were evaluated in order to elucidate the relationship between the hydrogen gas evolution and the tempered microstructures in the deformation. Cathodic hydrogen charging was carried out with a current density of 100A/m2for 1h at room temperature. For comparison, a tensile specimen was prepared without hydrogen charging. The HMT showed that silver particles, which are indicative of the hydrogen emission sites, were present mainly in the matrix as well as on the slip lines after the deformation. It is believed that the silver particles on the slip lines represent the effect of hydrogen transportation due to mobile dislocations. In addition, accumulation of silver particles around non-metallic inclusions such as Al2O3was also identified. This tendency was observed for different tempering conditions. From the relationship between the stress–strain curves and the hydrogen evolution, determined by using QMS under a UHV atmosphere, it was found that the hydrogen gas evolution behavior varied with the deformation stage.
