Author/Authors :
Zhang، نويسنده , , Z.W. and Liu، نويسنده , , C.T. and Guo، نويسنده , , S. and Cheng، نويسنده , , J.L. and Chen، نويسنده , , G. and Fujita، نويسنده , , Takeshi and Chen، نويسنده , , M.W. and Chung، نويسنده , , Yip-Wah and Vaynman، نويسنده , , Semyon and Fine، نويسنده , , Morris E. and Chin، نويسنده , , Bryan A.، نويسنده ,
Abstract :
The mechanical properties of Cu-rich nano-cluster-strengthened ferritic steels with and without boron doping were investigated. Tensile tests at room temperature in air showed that the B-doped ferritic steel has similar yield strength but a larger elongation than that without boron doping after extended aging at 500 °C. There are three mechanisms affecting the ductility and fracture of these steels: brittle cleavage fracture, week grain boundaries, and moisture-induced hydrogen embrittlement. Our study reveals that boron strengthens the grain boundary and suppresses the intergranular fracture. Furthermore, the moisture-induced embrittlement can be alleviated by surface coating with vacuum oil.
Keywords :
Ferritic steel , Boron doping , ductility , Moisture-induced embrittlement , Nano-cluster
