Assessment of white layer in hardened AISI 52100 steel and its prediction using grinding power

2017 ◽  
Vol 22 (2) ◽  
pp. 299-319 ◽  
Author(s):  
Umamaheswari Madopothula ◽  
Ramesh Babu Nimmagadda ◽  
Vijayaraghavan Lakshmanan
Keyword(s):  
White Layer ◽  
Aisi 52100 ◽  
Aisi 52100 Steel ◽  
Grinding Power

scholarly journals Plastic Strain Threshold Determination for White Layer Formation in Hard Turning of AISI 52100 Steel Using Micro-Grid Technique and Finite Element Simulations

2020 ◽  
Vol 142 (3) ◽  
Author(s):  
Guang-Chao Nie ◽  
Ke Zhang ◽  
Jose Outeiro ◽  
Serafino Caruso ◽  
Domenico Umbrello ◽  
...  
Keyword(s):  
Plastic Strain ◽  
Hard Turning ◽  
White Layer ◽  
Cryogenic Cooling ◽  
Cooling Conditions ◽  
Aisi 52100 ◽  
Aisi 52100 Steel ◽  
Grid Technique ◽  
Micro Grid ◽  
Strain Threshold

Abstract White layer (WL) formation in metal cutting is generally found to have negative effects on the corrosion and fatigue life of machined components. Nowadays, the mechanism of the WL formation has not been understood very well, especially about the contribution of the thermal and mechanical loadings generated by the cutting process on WL formation. The relationship between subsurface plastic strain caused by mechanical loadings and the formation of WLs is of our concern. To address this issue, WL formation in hard turning of AISI 52100 under dry and cryogenic cooling conditions is investigated by subsurface plastic strain measurement using the micro-grid technique, observed by scanning electron microscope (SEM). Due to the considerable low temperature, WL is mainly generated by the mechanical effect rather than the thermal one, and this hypothesis is supported by physically based finite element method (FEM) simulations. From the investigations, we discover the existing plastic strain threshold, which governs the occurrence of WL in hard turning of AISI 52100 steel under cryogenic cooling conditions.

scholarly journals Surface Integrity of AISI 52100 Steel during Hard Turning in Different Near-Dry Environments

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Ajay Chavan ◽  
Vikas Sargade
Keyword(s):  
Surface Roughness ◽  
Surface Integrity ◽  
Hard Turning ◽  
Vortex Tube ◽  
White Layer ◽  
Bearing Steel ◽  
Hybrid Nanofluid ◽  
Aisi 52100 ◽  
Aisi 52100 Steel ◽  
Cooling And Lubrication

AISI 52100 hardened bearing steel is popular in many industrial applications due to its excellent wear resistance and high strength. Therefore, a high level of surface integrity of the same is the utmost important requirement to enhance fatigue life. Machining of hardened AISI 52100 steel is difficult because severe plastic deformation and generation of high temperature alter the surface metallurgy of the machined component and hamper the tool life. The present investigation includes a comparative analysis of surface integrity of AISI 52100 bearing steel during hard turning under different near-dry environments, namely, dry, Minimum Quantity Cooling and Lubrication (MQCL), Compressed Chilled Air by Vortex Tube (CCAVT), and Hybrid Nanofluid Minimum Quantity Cooling and Lubrication (Hybrid NF-MQCL). Soyabean (a vegetable) oil is used as cutting fluid in MQCL and base fluid in Hybrid NF-MQCL environments. To prepare hybrid nanofluid, two different nanoparticles Al2O3 and MWCNT, are used. The chilled air is generated through a vortex tube. The surface integrity of AISI 52100 steel was studied in terms of microhardness, the thickness of the white layer, surface roughness (Ra), and residual stresses. Higher cutting speed and feed show positive and negative correlation on surface integrity of AISI 52100 steel, respectively. Hybrid nanofluid MQCL exhibits the lowest surface roughness (0.34 μm), microhardness (625 Hv0.1), compressive residual stresses (−168 MPa), and thin white layer (0.9 μm) in contrast, and dry machining shows higher surface roughness, microhardness, tensile residual stress, and thick white layer. In comparison, MQCL and CCAVT are found to be intermediate. It is found that hybrid nanofluid MQCL enhances the overall performance of the machined surface as compared to other near-dry techniques.

Microstructural Changes and Contact Temperatures During Fretting in Steel-Steel Contact

2000 ◽  
Vol 123 (4) ◽  
pp. 670-675 ◽  
Author(s):  
B. Podgornik ◽  
M. Kalin ◽  
J. Vizˇintin ◽  
F. Vodopivec
Keyword(s):  
White Layer ◽  
Subsurface Layer ◽  
Fretting Wear ◽  
Test Time ◽  
Large Area ◽  
Microstructural Changes ◽  
Aisi 52100 ◽  
Aisi 52100 Steel ◽  
Grinding Technique ◽  
Individual Contact

In fretting wear, the microstructure and the mechanical properties of the surface and subsurface layer depend significantly on the temperature field produced in the fretting zone. Information reported in the literature indicate contradictory values for the temperature produced at the interface under fretting conditions. In the present study, a successive grinding technique was used to examine the microstructural changes generated by fretting of AISI 52100 steel and the results were compared to the mathematically calculated contact temperatures using different models. Results of this investigation indicate that white layer starts to form under individual contact spots as a result of high flash temperatures and then over the test time it grows by coalescence to a single large area.

scholarly journals Residual Stresses in Machining of AISI 52100 Steel under Dry and Cryogenic Conditions: A Brief Summary

2014 ◽  
Vol 611-612 ◽  
pp. 1236-1242 ◽  
Author(s):  
Serafino Caruso ◽  
J.C. Outeiro ◽  
Domenico Umbrello ◽  
António Castanhola Batista
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
White Layer ◽  
Contact Fatigue ◽  
Cutting Speed ◽  
X Ray Diffraction ◽  
Machined Surface ◽  
Aisi 52100 ◽  
Aisi 52100 Steel ◽  
Tool Cutting

Residual stress is one of the most important surface integrity parameter that can significantly affect the service performance of a mechanical component, such as: contact fatigue, corrosion resistance and part distortion. For this reason the mechanical state of both the machined surface and subsurface needs to be investigated. Residual stress induced by dry and cryogenic machining of hardened AISI 52100 steel was determined by using the X-ray diffraction technique. The objective was to evaluate the influence of the tool cutting edge geometry, workpiece hardness, cutting speed, microstructural changes and cooling conditions on the distribution of the residual stresses in the machined surface layers. The results are analysed in function of the thermal and mechanical phenomena generated during machining and their consequences on the white layer formation.

Sign in / Sign up

Export Citation Format

Share Document