Influence of stress distribution on adhesion strength of sputtered hard coatings
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Machinability
Surface Integrity
Machinability
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We investigated the residual stress depth profile near the surface of steel treated by laser peening without coating using X‐ray diffraction at SPring‐8. This investigation was carried out using a constant penetration depth sin2ψ method. In this method, the sin2ψ diagram is measured controlling both the ψ angle and the X‐ray penetration depth simultaneously with a combination of the ω and χ axes of the 4‐circle goniometer. This method makes it possible to evaluate the residual stress and its depth profile in material with a stress gradient precisely and non‐destructively. As a result, we confirmed that a compressive residual stress was successfully formed all over the range of the depth profile in the steel treated properly by laser peening without coating.
Spring steel
Penetration (warfare)
Laser peening
Goniometer
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This paper is focused on analysis of residual stress of functional surfaces and subsurface layers created by precision technologies of hard machining for progressive constructional materials of forging tools. Methods of experiments are oriented on monitoring of residual stress in surface which is created by hard turning (roughing and finishing operations). Subsequently these surfaces were etched in thin layers by electro-chemical polishing. The residual stress was monitored in each etched layer. The measuring was executed by portable X-ray diffractometer for detection of residual stress and structural phases. The results significantly indicate rise and distribution of residual stress in surface and subsurface layers and their impact on functional properties of surface integrity.
Surface Integrity
Diffractometer
Surface layer
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Surface Integrity
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An optimum grinding condition was found by making clear the relation among the grinding performance of CBN grinding wheel, the grinding mechanism and the ground surface integrity. Following results are obtained : (1) The ground surface integrity observed through grinding chips, ground surface state, residual stress, crystallinity, structure and hardness distribution take a turn for the worse in slipping area. (2) The degree of worse depends on the load rate put on cutting edges. (3) The condition which wheel life is the longest, i.e., (g/a)-2.29 l1.76 = 1.98 × 109 is an optimum grinding condition including the ground surface integrity.
Surface Integrity
Slipping
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Machinability
Surface Integrity
Inconel
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Various methods exist for determining the qualitative and quantatiye integrity of a diamond-turned surface. Particularly, the micro-roughness and residual stress of surfaces are used for preliminary evaluation of surface integrity. That is to say, the availability of reflectors, capacity of disc-memory and other capabilities of diamond-turned surfaces are dependent on the surface integrity. The amount of micro-roughness and residual stress depend on the conditions of the machining process, in this case, on the single crystal diamond turning conditions. Especially, the residual stress are affected by the manufacturing (heat treatment and each machinig) of Al alloys. From these points, the paper describes the phenomena of micro-roughness and residual stress of the surface region caused by various machining coditions.
Surface Integrity
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Machinability
Surface Integrity
Titanium alloy
Characterization
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Surface Integrity
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Various methods exist for determining the qualitative and quantatiye integrity of a diamond-turned surface. Particularly, the micro-roughness and residual stress of surfaces are used for preliminary evaluation of surface integrity. That is to say, the availability of reflectors, capacity of disc-memory and other capabilities of diamond-turned surfaces are dependent on the surface integrity. The amount of micro-roughness and residual stress depend on the conditions of the machining process, in this case, on the single crystal diamond turning conditions. Especially, the residual stress are affected by the manufacturing (heat treatment and each machinig) of Al alloys. From these points, the paper describes the phenomena of micro-roughness and residual stress of the surface region caused by various machining coditions.
Surface Integrity
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