کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1448059 | 988663 | 2009 | 10 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Grain-boundary engineering markedly reduces susceptibility to intergranular hydrogen embrittlement in metallic materials Grain-boundary engineering markedly reduces susceptibility to intergranular hydrogen embrittlement in metallic materials](/preview/png/1448059.png)
The feasibility of using “grain-boundary engineering” techniques to reduce the susceptibility of a metallic material to intergranular embrittlement in the presence of hydrogen is examined. Using thermomechanical processing, the fraction of “special” grain boundaries was increased from 46% to 75% (by length) in commercially pure nickel samples. In the presence of hydrogen concentrations between 1200 and 3400 appm, the high special fraction microstructure showed almost double the tensile ductility; also, the proportion of intergranular fracture was significantly lower and the Jc fracture toughness values were some 20–30% higher in comparison with the low special fraction microstructure. We attribute the reduction in the severity of hydrogen-induced intergranular embrittlement to the higher fraction of special grain boundaries, where the degree of hydrogen segregation at these boundaries is reduced.
Journal: Acta Materialia - Volume 57, Issue 14, August 2009, Pages 4148–4157