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CSP流程Ti微合金化高強鋼的疲勞性能

Fatigue properties of Ti microalloyed high-strength steel by CSP process

  • 摘要: 采用升降法對CSP工藝生產的2mm厚Ti微合金化高強鋼的疲勞性能進行研究.結果發現:高強鋼的抗拉強度為830 MPa;疲勞強度為685 MPa,約為抗拉強度的0.83倍;伸長率為18.8%.繪制了高強鋼的S-N曲線,并擬合出疲勞壽命與最大應力的關系.通過掃描電鏡對疲勞斷裂機理進行了分析.宏觀疲勞斷口可見明顯的裂紋源區、擴展區和瞬斷區形貌.疲勞裂紋起始于帶鋼表面微裂紋;疲勞擴展區存在微觀疲勞輝紋、二次裂紋和宏觀疲勞貝紋線;瞬斷區出現撕裂棱,兼有韌窩存在.

     

    Abstract: The fatigue properties of 2 mm-thick Ti-microalloyed high-strength steel produced in a CSP line was studied by the up-down method. It is found that the tensile strength of the steel is 830 MPa, the fatigue strength is 685 MPa, about 0. 83 times as large as the tensile strength, and the elongation is 18. 8%. The S-N curve of the steel was drawn out and the relationship between the maximum stress and fatigue life was fitted. The cracking mechanism was analyzed by scanning electron microscopy. The crack source, expansion region, and eventual failure region appears significantly in the microscopic structure. Fatigue cracks initiate from microcracks on the strip surface. Microcosmic fatigue striations, secondary cracks, and macroscopic fatigue bay ridges are observed in the fatigue extension region. The eventual failure region meets the characteristics of tear edge morphology along with dimples.

     

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