Jiaqiang Dang , Yugang Li , Xunxun Zhang , Jingwei Zhang , Qi Wang , Qinglong An , Weiwei Ming , Haowei Wang , Ming Chen
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引用次数: 0
摘要
表面层疲劳寿命（FSL）是一种创新性的表征，可准确捕捉表面完整性对部件疲劳行为的影响。从工程断裂力学的角度，通过分析建模和疲劳试验，分析了 300 M 超高强度钢的 FSL 对代表性制造工艺引起的表面完整性指标的敏感性。引入超声波表面滚压工艺（USRP）优化了 300 M 钢的疲劳极限，并通过实验量化了疲劳寿命的提高。此外，还进行了断裂分析，以提供 USRP 可改善 300 M 钢疲劳行为的原因。结果表明，FSL 在整个疲劳寿命中占绝大多数，比例超过 95%，且与加工表面缺陷，尤其是表面加工痕迹有很大关系。工程 USRP 卓越的表面精加工效果和诱导的高压缩残余应力可将裂纹源从表面加工痕迹转移到表面下夹杂物中，从而大大延长疲劳裂纹起始寿命，进而延长整个疲劳寿命。具体而言，经过 USRP 处理后，受测 300 M 钢的疲劳寿命提高了 40 多倍，疲劳强度提高了 34.7%。
Surface fatigue characterization and its enhancement by the engineered ultrasonic rolling process for 300 M ultrahigh strength steel
The fatigue life of surface layer (FSL) is innovatively characterized to accurately capture the effect of surface integrity on the fatigue behavior of the components. The sensitivity of FSL of 300 M ultrahigh strength steel to the surface integrity indexes induced by representative manufacturing processes was analyzed by analytical modeling and fatigue tests from the perspective of engineering fracture mechanics. The ultrasonic surface rolling process (USRP) was introduced to optimize the fatigue limit of 300 M steel, and the improvement in fatigue life was experimentally quantified. Besides, the fracture analysis was conducted to provide the reason why USRP can enhance the fatigue behavior of 300 M steel. The results show that FSL occupies a majority with percentage of over 95 % in the entire fatigue life and a strong relation with the machined surface defects, especially the surface machining marks. The excellent surface finishing effect and high compressive residual stresses induced by engineered USRP could transfer the crack source from surface machining marks into subsurface inclusions, which greatly prolongs the fatigue crack initiation life and thereby the entire fatigue life. To be specific, the fatigue life was elevated by more than 40 times and the fatigue strength was increased by 34.7 % after USRP for the tested 300 M steel.
期刊介绍：
Theoretical and Applied Fracture Mechanics'' aims & scopes have been re-designed to cover both the theoretical, applied, and numerical aspects associated with those cracking related phenomena taking place, at a micro-, meso-, and macroscopic level, in materials/components/structures of any kind.
The journal aims to cover the cracking/mechanical behaviour of materials/components/structures in those situations involving both time-independent and time-dependent system of external forces/moments (such as, for instance, quasi-static, impulsive, impact, blasting, creep, contact, and fatigue loading). Since, under the above circumstances, the mechanical behaviour of cracked materials/components/structures is also affected by the environmental conditions, the journal would consider also those theoretical/experimental research works investigating the effect of external variables such as, for instance, the effect of corrosive environments as well as of high/low-temperature.
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