Effect of secondary banded structure on the fatigue properties of non-quenched and tempered micro-alloyed steel
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摘要: 采用應力比為0.1的軸向拉伸疲勞試驗分別研究了低合金鋼DG20Mn和35CrMo鋼的疲勞性能與帶狀組織的關系.結果表明:帶狀組織對試驗材料的軸向拉伸性能沒有明顯影響,對35CrMo鋼的軸向拉伸疲勞性能影響較小,但嚴重減弱DG20Mn鋼的軸向疲勞性能.帶狀組織對疲勞性能的影響主要是由于在高的疲勞拉應力下,帶狀組織引發疲勞微裂紋、微空洞等疲勞損傷,導致疲勞裂紋萌生及擴展模式發生變化,從而影響疲勞性能.Abstract: The effect of banded structure on the fatigue properties of DG20 Mn and 35 Cr Mo micro-alloyed steels was investigated by using axial tensile fatigue tests at a stress ratio of 0.1. The results show that secondary banded structure has no significant effect on the axial tensile properties of the tested steels and the axial tensile fatigue performance of 35 CrMo steel,but decreases the axial tensile fatigue performance of DG20 Mn steel. Under the high cyclic tensile stress,multi-source damage cracks in the steels initiated by secondary banded structure,which changes the fracture mode,is the major factor of the decrease in fatigue life of the steels.
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Key words:
- low alloyed steels /
- banded structure /
- fatigue properties /
- tensile fatigue tests
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