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首页> 外文会议>World conference on titanium >Effect of a Grain Size Gradient on the Profile and the Propagation of Short Surface Cracks in Titanium Grade 2
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Effect of a Grain Size Gradient on the Profile and the Propagation of Short Surface Cracks in Titanium Grade 2

机译：晶粒尺寸梯度对钛2级曲线裂缝的兴起及繁殖

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Titanium Grade 2 was used to study the influence of grain size gradients on the shape of short cracks originating from the sample surface. Round bars with a deformation gradient were used to produce microstructures with increasing and decreasing grain sizes in radial direction by suitable recrystallisation treatments. It is shown that the shape of an elliptical surface crack in a graded material depends strongly on the grain size distribution along the crack front. The ratio of the crack axes (depth/width) changes therefore during crack growth. Thus crack shape differs significantly from that in a homogeneous microstructure where the crack proceeds with a constant ellipticity. In order to avoid errors in the estimation of fatigue life times this change must be taken in consideration for the calculation of the crack propagation rates da/dN and for the cyclic stress intensity factor ΔK.
机译：钛等级2用于研究晶粒尺寸梯度对源自样品表面的短裂缝形状的影响。使用变形梯度的圆形条用于通过合适的重结晶处理产生微观结构，随着径向的增加和降低颗粒尺寸。结果表明，梯度材料中的椭圆形表面裂缝的形状在沿裂缝前沿的晶粒尺寸分布强烈取决于颗粒尺寸。因此，在裂纹生长期间，裂缝轴（深度/宽度）的比率变化。因此，在均匀的微观结构中，裂纹形状显着不同，其中裂缝以恒定的椭圆性进行。为了避免在估计疲劳寿命次数中的错误，考虑到计算裂缝传播速率DA / DN以及循环应力强度因子ΔK的计算必须考虑这种变化。

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