OALib Journal期刊
氢对纯镍多晶体循环形变行为的影响
, PP. 36-44
Abstract:
对充分退火的、晶粒尺寸约30—40μm的工业纯镍试样,分别在未充氢、电解充氢和充氢-驱氢情况下进行了恒应变幅对称拉-压低循环疲劳试验,应变幅范围从2.7×10~(-3)到4.9×10~(-3).记录了一定循环周数后的塑性滞后回线,由此测量了循环应力峰值σ_p,摩擦应力σ_F和反向应力σ_B实验表明,该镍试样充氢后,除疲劳至断裂的总寿命有明显降低外,循环硬化速率、达到饱和时的应力峰值σ_p和摩擦应力σ_F均有降低,并随应变幅的增加越趋明显,而反向应力σ_B则不因充氢而有明显变化.结合扫描电镜观察的结果进行了分析讨论.
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