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ANALYSIS OF RESIDUAL STRESSES IN MAIN CRANKSHAFT BEARINGS AFTER INDUCTION SURFACE HARDENING AND FINISH GRINDING

INDUCTION SURFACE HARDENING

ADVANTAGES

Short Heat Treatment Times

Good Repeatability

Hardened Layer Quality

Small or Negligible Subsequent Distortion

Minimum Subsequent Product Surface Oxidation

Good Possibilities for Automation

SURFACE INTEGRITY AND ITS LEVELS

Scientific discipline providing an integral assessment of the surface and surface layers
Measurement of Roughness and Analysis of Microstructure and Microhardness in the Thin Surface Layer
Studies of Residual Stresses in the Surface Layer and of the Mechanical Properties of the given material
Tests making clear the Behaviour of the given part under Operating Conditions

Important features on the curves are:

(a) the maximum value of the compressive residual stress in the hardened surface layer.

(b) the maximum value of the tensile residual stress in the hardened surface layer.

© the transition width from compressive to tensile residual stress in the hardened surface layer.

(d ) the transition steepness from a compressive to a tensile residual stress profile.

(e) the depth with a transition microstructure.

The last phase in the manufacturing of crankshafts is finish grinding in order to achieve the desirable condition at the surface and in the surface layer, i.e.:

1. The grinding residual stresses must be compressive or lowest tensile so that the favourable residual stress profile obtained by induction surface hardening of the surface layer is maintained.

2. There must be the smallest changes possible in the microstructure and thus also in the hardness and microhardness profiles in the heat-affected zone after finish grinding.

Microstructural changes depends on:

Contact zone

Temperature variation

The volume changes that may occur in the surface layer after steel grinding are thus as follows:

1. The formation of residual austenite contributes to the formation of tensile residual stresses due to finish grinding.

2. The lower content of cementite carbide phase results in the formation of ledeburite containing residual austenite, which contributes to the formation of tensile residual stresses due to finish grinding.

3. Tempering effects in the martensite microstructure also contribute to the formation of tensile residual stresses due to finish grinding.

4. Material plastic deformation due to finish grinding can produce compressive or tensile residual stresses depending on the type of grinding wheel and the grinding conditions.

Induction surface hardening creates a very desirable residual stress state at the surface and residual stress distribution below the surface

Residual stresses are always of a compressive nature and are usually present to the depth of the induction surface hardened layer

Additional grinding of the induction surface hardened surface has an adverse effect on the stress state in the surface layer, since grinding always induces tensile residual stresses

Correct selection of the machining conditions and the grinding wheel helps lessening the relative grinding tensile residual stress distributions which will help keep the favourable residual stress state after induction surface hardening
Abstract:
The exact pattern of residual stresses will depend on the heat treatment temperatures
employed, the depth of hardening and the type of quenchant. Process conditions that give rise to
compressive residual stresses on the surface of heat-treated components are favourable. This type of
residual stress delays the initiation of fatigue cracking in service, which typically occurs on the surface
of the part under the action of cyclic tensile stresses. The last phase in the manufacturing of crankshafts
is nish grinding in order to achieve the desirable condition of the surface and the subsurface layer,
i.e. suitable dimensions, suitable surface roughness and the corresponding distribution of relative
grinding residual stress in the subsurface have to be ensured. By correct selection of the grinding
wheel and grinding conditions, taking into account the physical and mechanical properties of the
workpiece material, the very favourable compressive residual stresses in the hardened surface layer
will be retained after grinding.

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to get information about the topic"ANALYSIS OF RESIDUAL STRESSES IN MAIN CRANKSHAFT BEARINGS AFTER INDUCTION SURFACE"refer the page link bellow

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sir i need this seminar report and ppt on thIs
"ANALYSIS OF RESIDUAL STRESSES IN MAIN CRANKSHAFT BEARINGS AFTER INDUCTION SURFACE" PLZ ITS VERY URGENT