Shot Peening Effects on Subsurface Layer Properties and Fatigue Performance of Case‐Hardened 18CrNiMo7‐6 Steel

Ho, Hsin Shen; Li, D. L.; Zhang, E.; Niu, PengHui

doi:10.1155/2018/3795798

Cited by 13 publications

(7 citation statements)

References 28 publications

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“…AWJP treatments can improve the mechanical properties of the surface of 18CrNiMo7-6 steel, as the retained austenite contents decrease near the surface region. These similar results could be found in SP treatments [5,21].…”

Section: Residual Stress Analysessupporting

confidence: 89%

“…Firstly, the cross-sectional microstructure of the sample S2 displays a typical carburized steel. The casehardened zone consists of an almost martensite microstructure with a very small quantity of retained austenite and finely dispersed undissolved spherical carbide particles [5]. Secondly, it can be found that the plastic deformation layer is built on the surface of sample S2.…”

Section: Microstructurementioning

confidence: 95%

“…In addition, key components require hard surface layers and good surface quality. Surface deformation strengthening methods, such as shot peening (SP) [5,6], laser shot peening (LSP) [7,8], surface mechanical grinding treatment (SMGT) [9,10] and surface mechanical attrition treatment (SMAT) [11,12] can generate a beneficial microstructure and compressive residual stress to induce property enhancements. The surface deformation strengthening technology means to make the surface produce a certain degree of plastic deformation led to the forming of a certain depth of the deformation layer, which can improve the material properties [13].…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Surface Integrity in 18CrNiMo7-6 Steel after Multiple Abrasive Waterjet Peening Process

Zou

et al. 2020

Metals

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Abrasive waterjet peening (AWJP) as an important surface strengthening method can effectively improve surface properties. In this study, after multiple AWJP, the distribution of compressive residual stress and roughness on the surface of 18CrNiMo7-6 steel has been evaluated by an X-ray diffraction (XRD) method and a 3D surface topography system, respectively. Compared with the single AWJP, multiple AWJP can obviously increase the surface residual stresses (−1024 MPa to −1455 MPa) and the depth of maximum compressive residual stress (100 μm to 120 μm), as well as make the stress distribution more uniform. In terms of the surface roughness, multiple AWJP influences its uniform distribution and reduces the surface roughness (Sa = 0.69 μm), compared with a single AWJP (Sa = 2.96 μm), due to the smaller shot balls and a uniform deformation during multiple AWJP. In addition, we have studied the effects of multiple AWJP on the hardness of the surface layer. The results show that multiple AWJP increases the hardness by up to 15.9%, compared to the single AWJP. These studies provide useful insight into improving the surface properties of 18CrNiMo7-6 steel by multiple AWJP.

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Section: Residual Stress Analysessupporting

confidence: 89%

Section: Microstructurementioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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Evaluation of Surface Integrity in 18CrNiMo7-6 Steel after Multiple Abrasive Waterjet Peening Process

Zou

et al. 2020

Metals

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“…Especially beyond the coverage of 1000%, no obvious changes occur with increasing coverage. This phenomenon indicates that the plastic deformation of the material has reached its limit, and the high dislocation density and carbon content prevent the further accumulation of local plastic strain near the surface [36]. Therefore, it can also be concluded that there exists a saturation value of hardness for shot peened gears under different coverage.…”

Section: Microhardnessmentioning

confidence: 93%

Determination of the optimal coverage for heavy-duty-axle gears in shot peening

Yan

Zhu

Chen

et al. 2021

Int J Adv Manuf Technol

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Pitting and wear often appear on heavy-duty-axle gears due to their harsh working conditions, such as high torques, high loads and poor lubrication. Shot peening is a popular surface strengthening method for gears. In order to ensure complete coverage during shot peening, 100%~200% coverage is usually prescribed for most gears. However, it is difficult to effectively improve the contact fatigue and wear resistance of heavy-duty-axle gears. Generally, increasing shot peening coverage can heighten the compressive residual stress for prolonging the service lifetime of gears. Whereas, high coverage levels may cause the deterioration of surface roughness, thus increase the noise and vibration of gears. To address this issue, this paper deals with the determination of optimal coverage for heavy-duty-axle gears by experimental tests. The influence of shot peening coverage on the surface integrity of gears is analyzed in terms of residual stress, microhardness, surface morphology and dislocation density. The results show that the maximum compressive residual stress increases first and then keeps stable with the increase of coverage, and the maximum value is −1172.10 MPa. The microhardness peak increases obviously in the beginning and then slowly rises with the increase of coverage, and the maximum value is 747.5 HV1.0. The surface roughness (Ra) decreases initially and then enhances with the increase of coverage, and the minimum value is 0.99 μm under the coverage of 1000%. The dislocation density increases with the increase of coverage, and the maximum value is 3.70×10 16 m -2 . Numerous damages (microscalings, spallings) occur on the treated gear tooth flank affecting the residual stress distribution and roughness under high coverage levels. Taking into consideration of service lifetime, working noise and economic efficiency, the coverage of 1000% is the optimal coverage for heavy-duty-axle gears in shot peening.

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“…18CrNiMo7-6 steel is widely used in aviation, automobile, electric power, and other industrial fields [24,25]. The technologies for the surface-strengthening treatment of 18CrNiMo7-6 steel include carburizing [26][27][28], shot peening [29,30], waterjet peening, surface rolling, etc. These surface-strengthening treatment methods can induce microstructural changes, produce compressive residual stress, and improve fatigue properties.…”

Section: Introductionmentioning

confidence: 99%

Dry Hard Turning versus Grinding—The Influence of Machining-Induced Surface Integrity on Fatigue Performance

et al. 2023

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Dry hard turning (DHT) provides an effective process for finishing high-hardness materials. Machining-induced surface integrity has a direct impact on functional performance. This study compares the effects of the DHT and grinding processes on machining-induced surface integrity and fatigue performance of 18CrNiMo7-6 steel. The DHT and grinding experiment were carried out by using a polycrystalline cubic boron nitride tool and corundum wheel, respectively. The 3D surface morphology, surface roughness, surface residual stress, and machining accuracy of the hourglass-shaped specimen were measured. The fatigue fracture was characterized by scanning electron microscopy. The experimental results show that compared to grinding, DHT has obtained a larger surface compressive residual stress (the maximum axial and tangent residual stresses are −762.6 MPa and −442.8 MPa, respectively) and a lower surface roughness (the minimum Ra and Rq are 0.172 μm and 0.230 μm, respectively). This study is an attempt to use DHT instead of a grinding process to finish 18CrNiMo7-6 steel, providing a reference for high-quality and sustainable manufacturing of hardened steel.

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Shot Peening Effects on Subsurface Layer Properties and Fatigue Performance of Case‐Hardened 18CrNiMo7‐6 Steel

Cited by 13 publications

References 28 publications

Evaluation of Surface Integrity in 18CrNiMo7-6 Steel after Multiple Abrasive Waterjet Peening Process

Evaluation of Surface Integrity in 18CrNiMo7-6 Steel after Multiple Abrasive Waterjet Peening Process

Determination of the optimal coverage for heavy-duty-axle gears in shot peening

Dry Hard Turning versus Grinding—The Influence of Machining-Induced Surface Integrity on Fatigue Performance

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