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首页> 外文期刊>ISIJ international >Intrinsic Factors that Trigger the Coaxing Effect in Binary Fe–C Ferritic Alloys with a Focus on Strain Aging
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Intrinsic Factors that Trigger the Coaxing Effect in Binary Fe–C Ferritic Alloys with a Focus on Strain Aging

机译：引发应变时效的二元Fe-C铁素体合金中引起同轴化作用的内在因素

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The coaxing effect has been recognized as a phenomenon that enhances the fatigue resistance associated with work hardening and strain-age hardening. To uncover the intrinsic factors that affect the degree of coaxing effect, rotating bending fatigue tests including a process of stepwise stress increases every 10~(7) cycles were carried out at ambient temperature in interstitial free steel and binary Fe–C ferritic alloys. The effects of the work hardening capacity, aging time, stress amplitude increment, and carbon concentration were examined in this simple alloy system. The work hardening capacity was changed by controlling carbon state in a Fe-0.017C (wt%) steel. However, the degree of coaxing effect did not show a significant correlation with work hardening capacity. For the effect of aging time, a fatigue test at a high stress amplitude was interrupted, aged for 2 weeks, and subsequently restarted. Although this process is sufficient to induce strain-age hardening in terms of aging time and plastic strain, a fatigue life of the aged steel was not comparable to that with the coaxing effect. Moreover, an increase in stress increment for each step deteriorated a degree of coaxing effect. It was concluded that the effect of work hardening is minor, and the other factors affecting strain-age hardening must be optimized simultaneously to show a coaxing effect. In addition, the degree of coaxing effect of smooth steel specimens was predominantly controlled by the intergranular fatigue crack initiation behavior. Consequently, a considerable amount of solute carbon and an alternate process for the stress amplitude increment and aging time are required for strain-age hardening that suppresses intergranular fatigue crack initiation.
机译：同轴作用被认为是一种增强了与加工硬化和应变时效硬化相关的抗疲劳性的现象。为了揭示影响同轴作用程度的内在因素，在室温下对间隙自由钢和二元铁碳铁素体合金进行了旋转弯曲疲劳试验，包括每10〜（7）个循环逐步增加应力的过程。在这种简单的合金体系中，研究了加工硬化能力，时效时间，应力幅度增加和碳浓度的影响。通过控制Fe-0.017C（wt％）钢中的碳态来改变加工硬化能力。但是，同轴效应的程度与工作硬化能力没有显着相关性。对于老化时间的影响，高应力振幅的疲劳试验被中断，老化了2周，然后重新开始。尽管此过程足以在时效时间和塑性应变方面引起应变时效硬化，但时效钢的疲劳寿命无法与同轴作用媲美。此外，每一步的应力增量的增加都会降低同轴作用的程度。结论是，加工硬化的影响很小，并且必须同时优化影响应变时效硬化的其他因素，以显示出同轴作用。另外，光滑钢试样的同轴作用程度主要受晶间疲劳裂纹萌生行为的控制。因此，为了抑制晶界疲劳裂纹的产生，需要进行大量的固溶碳和应力振幅增加和时效时间的交替处理。

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