Experimental study on surface integrity and fatigue life of an ultra-high strength steel by the composite strengthening process of pre-torsion and ultrasonic rolling

Liang, Zhiqiang; Li, Zekun; Li, Xuezhi; Li, Hongwei; Cai, Zhipeng; Liu, Xinli; Chen, Yifan; Xie, Lijing; Zhou, Tianfeng; Wang, Xibin

doi:10.1016/j.engfailanal.2023.107333

Cited by 9 publications

(3 citation statements)

References 49 publications

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“…It is also easier to obtain a large residual compressive stress by increasing the static preload compared with increasing impact rounds [20]. The maximum residual compressive stress reached 1195 MPa after six impact rounds with a static preload of 1500 N. A large residual compressive stress can effectively suppress the initiation and expansion of cracks [21].…”

Section: Surface Residual Compressive Stress Fieldmentioning

confidence: 99%

The Effects of Ultrasonic Impact Modification on the Surface Quality of 20CrNiMo Carburized Steel

Jiang,

Zhu,

Chen

et al. 2023

Coatings

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Ultra-high residual compressive stress can be introduced via the ultrasonic impact on the basis of transformation hardening, and further enhance the overall performance of 20CrNiMo carburized steel. In order to achieve the best surface quality of 20CrNiMo carburized steel, ultrasonic impact modification testing with varying static loads (900 N, 1200 N, and 1500 N) and rounds (1, 3, and 6) was conducted. By characterizing microhardness, microstructure, the surface roughness and residual compressive stress, the influence of ultrasonic impact modification parameters on its surface quality were analyzed. The experimental results indicated that the static loads and rounds of ultrasonic impact modification had a significant impact on the surface quality. The best surface quality could be obtained after six rounds of ultrasonic impact modification under a static load of 1200 N. In addition, the surface roughness decreased from 0.40 μm to 0.04 μm, the surface microhardness increased from 679 HV0.1 to 1086 HV0.1, and the maximum residual compressive stress of 1195.36 MPa was formed. Furthermore, the surface quality would deteriorate when the static load and ultrasonic impact rounds were increased.

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Section: Surface Residual Compressive Stress Fieldmentioning

confidence: 99%

The Effects of Ultrasonic Impact Modification on the Surface Quality of 20CrNiMo Carburized Steel

Jiang,

Zhu,

Chen

et al. 2023

Coatings

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“…Many studies have demonstrated that higher surface residual compressive stresses inhibit microscopic crack growth [ 7 , 8 ]. Because the initiation and growth of microscopic cracks eventually lead to fatigue fracture failure [ 9 , 10 ], the fatigue lives of key components can be effectively enhanced by reducing the surface roughness and increasing the surface hardness and residual compressive stress values, i.e., improving the surface integrity [ 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Multi-Objective Process Parameter Optimization of Ultrasonic Rolling Combining Machine Learning and Non-Dominated Sorting Genetic Algorithm-II

Chen,

Yang,

Chen

et al. 2024

Materials

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Ultrasonic rolling is an effective technique for enhancing surface integrity, and surface integrity is closely related to fatigue performance. The process parameters of ultrasonic rolling critically affect the improvement of surface integrity. This study proposes an optimization method for process parameters by combining machine learning (ML) with the NSGA-II. Five ML models were trained to establish relationships between process parameters and surface residual stress, hardness, and surface roughness by incorporating feature augmentation and physical information. The best-performing model was selected and integrated with NSGA-II for multi-objective optimization. Ultrasonic rolling tests based on a uniform design were performed, and a dataset was established. The objective was to maximize surface residual stress and hardness while minimizing surface roughness. For test specimens with an initial surface roughness of 0.54 µm, the optimized process parameters were a static pressure of 900 N, a spindle speed of 75 rpm, a feed rate of 0.19 mm/r, and rolling once. Using optimized parameters, the surface residual stress reached −920.60 MPa, surface hardness achieved 958.23 HV, surface roughness reduced to 0.32 µm, and contact fatigue life extended to 3.02 × 107 cycles, representing a 52.5% improvement compared to untreated specimens and an even more significant improvement over without parameter optimization.

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“…Furthermore, the microhardness of the treated surface was elevated via ultrasonic treatment, causing a decrease in the weld's bending performance. ZhiQiang Liang et al [33] made use of ultrasonic rolling to harden the surface of ultra-high-strength steel (45CrNiMoVA) while also investigating the progression of fatigue life on the surface of ultra-high-strength steel. The results show that ultrasonic rolling increased the residual compressive stress amplitude on the surface of ultra-high-strength steel, affecting the depth of the hardness layer and ultimately improving the material's mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ultrasonic Treatment on Microstructure and Properties of 2000 MPa Ultra-High-Strength Steel-Welded Joints

Chu,

Wang,

Yuan

et al. 2023

Coatings

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The microstructure and mechanical properties of ultra-high-strength steel weld joints were examined for the effect of ultrasonic treatment. ER120S-G welding wire is necessary for welding 4 mm thick ultra-high-strength steel. After that, the weld toe region underwent different parameters of the ultrasonic stress relief process. As a means of surface treatment for weld seams, noticeable grain refinement and the formation of a fine-grained layer were observed in the weld toe region after ultrasonic treatment. The blind hole method was used to measure residual stresses in the weld seam, which indicated a transition from tensile stress to compressive stress in the treated portion of the joint. Different ultrasonic treatment processes resulted in a significant increase in hardness values near the weld toe region during hardness testing. The hardness of the weld joint that was treated with ultrasound increased initially but then stabilized after increasing the frequency. The ultrasound-treated joints showed a significant improvement in both tensile strength and fracture elongation, as demonstrated in the tensile tests.

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Experimental study on surface integrity and fatigue life of an ultra-high strength steel by the composite strengthening process of pre-torsion and ultrasonic rolling

Cited by 9 publications

References 49 publications

The Effects of Ultrasonic Impact Modification on the Surface Quality of 20CrNiMo Carburized Steel

The Effects of Ultrasonic Impact Modification on the Surface Quality of 20CrNiMo Carburized Steel

Multi-Objective Process Parameter Optimization of Ultrasonic Rolling Combining Machine Learning and Non-Dominated Sorting Genetic Algorithm-II

Effect of Ultrasonic Treatment on Microstructure and Properties of 2000 MPa Ultra-High-Strength Steel-Welded Joints

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