http://scholars.ntou.edu.tw/handle/123456789/4696
標題: | Hydrogen embrittlement susceptibility of laser-hardened 4140 steel | 作者: | L.W Tsay Z.W Lin R.K Shiue C Chen |
關鍵字: | Slow strain rate tensile test;Laser hardening;AISI 4140 steel;Hydrogen embrittlement;Intergranular fracture | 公開日期: | 十月-2000 | 卷: | 290 | 期: | 1-2 | 起(迄)頁: | 46-54 | 來源出版物: | Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing | 摘要: | Slow strain rate tensile (SSRT) tests were performed to investigate the susceptibility to hydrogen embrittlement of laser-hardened AISI 4140 specimens in air, gaseous hydrogen and saturated H2S solution. Experimental results indicated that round bar specimens with two parallel hardened bands on opposite sides along the loading axis (i.e. the PH specimens), exhibited a huge reduction in tensile ductility for all test environments. While circular-hardened (CH) specimens with 1 mm hardened depth and 6 mm wide within the gauge length were resistant to gaseous hydrogen embrittlement. However, fully hardened CH specimens became susceptible to hydrogen embrittlement for testing in air at a lower strain rate. The strength of CH specimens increased with decreasing the depth of hardened zones in a saturated H2S solution. The premature failure of hardened zones in a susceptible environment caused the formation of brittle intergranular fracture and the decrease in tensile ductility. |
URI: | http://scholars.ntou.edu.tw/handle/123456789/4696 | ISSN: | 0921-5093 | DOI: | 10.1016/s0921-5093(00)00950-3 |
顯示於: | 光電與材料科技學系 |
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