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首页> 外文期刊>MATEC Web of Conferences >Effects of mean strain and tensile pre-strain on torsional fatigue behaviours of duplex stainless steel SAF2205
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Effects of mean strain and tensile pre-strain on torsional fatigue behaviours of duplex stainless steel SAF2205

机译：平均应变和拉伸预应变对SAF2205双相不锈钢扭转疲劳行为的影响

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Effects of mean strain and tensile pre-strain were investigated on the torsional fatigue behaviours of duplex stainless steel SAF2205. Two equivalent strain amplitudes (0.5%,0.7 %), three strain ratios (-1, - 0.5, -0.25) and 5% tensile pre-strain were chosen. Results indicated that the mean strain had no distinct influences on the torsional fatigue behaviours in terms of cyclic stress reponse and fatigue life while tensile pre-straining made a significant increase in cyclic stress response which was mainly attributed to the cross hardening derived from the loading sequence of monotonic tension preceding to cyclic torsion and led to a reduction in fatigue life. The failure mechanisms were revealed by scanning electron microscope characterized by microcracks initiation at the extrusions in ferrite and phase boundary inhibited further propagation. Additionally, the fractography of all fatigued specimens revealed a quasi-cleavage brittle mode with features of distinct tearing ridges and cleavage facets.
机译：研究了平均应变和拉伸预应变对双相不锈钢SAF2205扭转疲劳行为的影响。选择了两个等效应变幅度（0.5％，0.7％），三个应变比率（-1，-0.5，-0.25）和5％拉伸预应变。结果表明，平均应变在循环应力响应和疲劳寿命方面对扭转疲劳行为没有明显影响，而拉伸预应变使循环应力响应显着增加，这主要归因于加载顺序产生的交叉硬化循环扭转之前的单调张力降低，导致疲劳寿命降低。通过扫描电子显微镜揭示了失效机理，其特征在于在铁素体中的挤压处出现微裂纹，并且相界抑制了进一步的传播。此外，所有疲劳标本的形貌均显示出准解理脆性模式，具有明显的撕裂脊和解理面。

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