Shengwei Qin , Guangrui Wang , Qihui Tian , Zhihua Liu , Minghao Zhao
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引用次数: 0
Abstract
In order to expand the application scope of the quenching-partitioning-tempering (Q-P-T) steel in the industrial field, ultrasonic rolling treatment (USRP) is carried out, and the influence of USRP on the fatigue properties of the Q-P-T steel is elucidated. Compared with the Q-P-T specimen (580 MPa), the fatigue limit of the USRP3 specimen increases to 620 MPa, and the crack initiation location is transferred from the surface to the core. The primary reasons for this fatigue strength incensement are as follows: a higher surface hardness effectively inhibits surface fatigue crack initiation; residual compressive stress reduces the driving force at crack tips and impedes crack propagation. Moreover, there is a continuous increase in hardness for the USRP3 specimen during cyclic loading due to dominant phase transformation strengthening effect caused by transformation from austenite to martensite. On the other hand, the USRP6 specimen possesses a gradient grain size structure with higher hardness and deeper range, which can decelerate crack propagation rate. However, surface damage caused by excessive ultrasonic rolling as well as the cyclic softening effect of the surface during fatigue ultimately counterbalance the positive influence of surface strengthening on fatigue properties.
期刊介绍：
Typical subjects discussed in International Journal of Fatigue address:
Novel fatigue testing and characterization methods (new kinds of fatigue tests, critical evaluation of existing methods, in situ measurement of fatigue degradation, non-contact field measurements)
Multiaxial fatigue and complex loading effects of materials and structures, exploring state-of-the-art concepts in degradation under cyclic loading
Fatigue in the very high cycle regime, including failure mode transitions from surface to subsurface, effects of surface treatment, processing, and loading conditions
Modeling (including degradation processes and related driving forces, multiscale/multi-resolution methods, computational hierarchical and concurrent methods for coupled component and material responses, novel methods for notch root analysis, fracture mechanics, damage mechanics, crack growth kinetics, life prediction and durability, and prediction of stochastic fatigue behavior reflecting microstructure and service conditions)
Models for early stages of fatigue crack formation and growth that explicitly consider microstructure and relevant materials science aspects
Understanding the influence or manufacturing and processing route on fatigue degradation, and embedding this understanding in more predictive schemes for mitigation and design against fatigue
Prognosis and damage state awareness (including sensors, monitoring, methodology, interactive control, accelerated methods, data interpretation)
Applications of technologies associated with fatigue and their implications for structural integrity and reliability. This includes issues related to design, operation and maintenance, i.e., life cycle engineering
Smart materials and structures that can sense and mitigate fatigue degradation
Fatigue of devices and structures at small scales, including effects of process route and surfaces/interfaces.
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