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首页> 外文会议>Asian Pacific conference for fracture and strength'99 (APCFS'99) >HIGH CYCLES FATIGUE PROPERTIES OF EXTRA-LOW CARBON STEELS WITH 0.50 Mn
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HIGH CYCLES FATIGUE PROPERTIES OF EXTRA-LOW CARBON STEELS WITH 0.50 Mn

机译：0.50％Mn超低碳钢的高循环疲劳性能

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摘要

The effect of both ferrite work-hardening and low carbonrncontent on fatigue crack initiation and non-propagatingrnmicro-cracks have been investigated on three kinds of lowrncarbon steels containing 0.5% Mn. The fatigue tests wererncarried out using the Ono-type rotating bending fatigue testingrnmachine of uniform distributed load. The investigatedrnmaterials in this study were A, B and C with carbon contentsrn0.0014, 0.0100, and 0.062% respectively, was produced byrnthermo-mechanically controlled rolling process. A vacuumrnannealing treatment at 900oC was performed to unify grainrnsize to be about 100 μm. It is concluded that, the as-rolledrnfatigue limit by 1x10~7 cycles of materials A_1, B_1, and C_1 is 170,rn170, and 160 Mpa, respectively. While, the as-annealedrnfatigue limit of materials A_2, B_2, and C_2 is 140, 130, and 150rnMpa, respectively. The as-annealed fatigue limit decreasesrndue to enhancing the existence of slip bands by highlyrnannihilated structure. Severe hot rolling conditions increasernthe fatigue limit due to suppressing the slip bands by highlyrnwork-hardened structure. Successive micro-crackrnobservations of material A_1 under fatigue limit by 1x107rncycles show an existence of micro-cracks among slip bands.rnFurthermore, micro-crack observations of material A1 at stressrnamplitude 140 Mpa, by 1x10~7 cycles, show that thernnon-propagating micro-cracks with slip bands exist. Onrncontrary, after removing all wok-hardened layer, thernnon-propagating micro-cracks do not exist. On the other hand,rnthe other materials show an existence of slip bands underrnfatigue limit by 1x10~7 cycles except material C_2,rnnon-propagating micro-cracks were observed.
机译：研究了三种含0.5％Mn的低碳钢的铁素体加工硬化和低碳含量对疲劳裂纹萌生和非扩展微裂纹的影响。使用均匀分布载荷的小野式旋转弯曲疲劳试验机进行疲劳试验。通过热机械控制轧制工艺生产的碳，碳含量分别为0.0014、0.0100和0.062％的材料为A，B和C。进行900oC的真空退火处理以将晶粒尺寸统一为约100μm。得出的结论是，材料A_1，B_1和C_1的1x10〜7个循环的疲劳极限分别为170，rn170和160 Mpa。而材料A_2，B_2和C_2的退火疲劳极限分别为140、130和150rnMpa。退火后的疲劳极限由于高度enhancing灭的结构增加了滑带的存在而降低。严酷的热轧条件由于通过高度加工硬化的结构抑制了滑移带而增加了疲劳极限。在疲劳极限下以1x107rncycles对材料A_1进行的连续微裂纹观察表明，滑移带之间存在微裂纹.rn此外，在140mpa应力幅值下通过1x10〜7个周期对材料A1的微裂纹观察表明，非传播的微裂纹存在带滑的裂缝。相反，在去除所有的铁锅硬化层之后，不存在非蔓延的微裂纹。另一方面，除C_2材料外，其他材料均在疲劳极限下存在1×10〜7个循环的滑移带，观察到非扩展性微裂纹。

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