Hohenwarter A, Pippan R
Department of Materials Physics, Montanuniversität Leoben, Jahnstr. 12, A-8700 Leoben, Austria.
Acta Mater. 2013 May;61(8):2973-2983. doi: 10.1016/j.actamat.2013.01.057.
The fracture behaviour of pure iron deformed by equal-channel angular pressing via route A was examined. The fracture toughness was determined for different specimen orientations and measured in terms of the critical plane strain fracture toughness, , the critical integral, , and the crack opening displacement for crack initiation, . The results demonstrate that the crack plane orientation has a pronounced effect on the fracture toughness. Different crack plane orientations lead to either crack deflection or delamination, resulting in increased fracture resistance in comparison to one remarkably weak specimen orientation. The relation between the microstructure typical for the applied deformation route and the enormous differences in the fracture toughness depending on the crack plane orientation will be analyzed in this paper.
研究了通过A路径等通道转角挤压变形的纯铁的断裂行为。针对不同的试样取向测定了断裂韧性，并以临界平面应变断裂韧性、临界积分和裂纹萌生时的裂纹张开位移来衡量。结果表明，裂纹平面取向对断裂韧性有显著影响。不同的裂纹平面取向会导致裂纹偏转或分层，与一种明显较弱的试样取向相比，从而提高了抗断裂能力。本文将分析所采用变形路径典型的微观结构与取决于裂纹平面取向的断裂韧性巨大差异之间的关系。
