Low-cycle fatigue properties of 800 MPa-grade ultrafine-grained steel
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摘要: 對利用馳豫-析出-控制相變(TMCP+RPC工藝)技術獲得的800MPa級超細晶粒低合金高強度鋼的低周疲勞性能進行了測試,并對其循環特性和疲勞斷口進行了觀察和分析,發現該材料為循環軟化,而且隨著應變幅的提高,材料的軟化速率逐漸增大.對材料的疲勞斷口觀察表明,疲勞裂紋起始于試樣表面,沿斷口周邊分布,呈多源性特征.Abstract: The low-cycle fatigue test of 800 MPa-grade ultrafine-grained HSLA was done. The result showed that the low-cycle fatigue cycle characteristic of the material is cyclic softening under the experimental condition and the softening velocity increases with the increasing of strain amplitude. Observations of the fatigue fractography revealed that fatigue cracks start from the material surface and distribute along the fracture border, which have multi-fatigue origins.
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Key words:
- ultra fine-grade steel /
- low-cycle fatigue /
- cycle characteristic /
- HSLA
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