Calculation of transformation sequences in quenched steel components to help predict internal stress distribution

Gergely, M.; Somogyi, Sz.; Buza, Gábor

doi:10.1179/026708385790124107

Cited by 2 publications

(1 citation statement)

References 5 publications

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“…In Gas Carburizing and Induction hardening the heating and sudden cooling causes phase transformations on the surface layer and beneath the surface of the workpiece. Heat treatment temperature, Quenching Temperature, Type of Quenchant, Quenching period, heat treatment period are major variables, which influence the phase transformation [1].…”

Section: Introductionmentioning

confidence: 99%

Residual Stresses in Case Hardened Materials

Palaniradja¹,

Alagumurthi²,

Soundararajan³

2010

TOMSJ

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Fatigue behavior of case hardened parts depend to a great extent on the type of residual stresses developed in the components. Topography and metallurgical effects were the two elements which contribute much to surface integrity. Micro hardness of the gas carburized (EN 33 and EN 36) and Induction hardened (AISI 1040 and AISI 6150) specimens obtained during experiments, showed that there was gradual decrease of hardness from surface to sub-surface. Results also showed that more the hardness and case depth, the more was the residual stress. The optimum results gave the maximum compressive residual stress in both the gas carburizing and Induction hardening process irrespective of the mechanisms involved in the process. The X-ray diffraction test showed that the distribution of residual stress was uniform both on the surface and beneath the surface. The magnitude and distribution of residual stress obtained from the experiment agreed with the FEM results found in literatures.

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Section: Introductionmentioning

confidence: 99%

Residual Stresses in Case Hardened Materials

Palaniradja¹,

Alagumurthi²,

Soundararajan³

2010

TOMSJ

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Minimizing Stress and Distortion for Shafts and Discs by Controlled Quenching in a Field of Nozzles

Brzoza

Specht

Ohland

et al. 2006

Mat.-wiss. u. Werkstofftech.

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A coupled gas-dynamical and thermo-mechanical model for simulation of the gas flow, gas and specimen temperature, phase, stress, strain, and displacement transient-fields during quenching of cutting discs and shafts of steel is introduced. The material properties (e. g. density, conductivity, heat capacity, hardness) are obtained by homogenization procedures. The material behaviour is described as an extension of the classical J 2 -plasticity theory with the extension of temperature and phase fraction dependent yield criteria. The coupling effects such as dissipation, phase transformation enthalpy, and transformation induced plasticity (TRIP) are considered. Simulations were carried out for cutting discs of knives, and for shafts made of steel SAE 52100 with varying diameter. For the validation of the simulations, these work pieces were heated in a roller hearth kiln up to 850 C, and than quenched in a field of nozzles in which the heat transfer coefficient was known and could be locally adjusted by the volume flow of each nozzle. The phase fractions, surface hardness, distortion, and residual stresses were measured. The simulated and measured results fit quite well. According to optimization-simulations the shafts were quenched with a certain heat transfer coefficient distribution. The bigger diameter parts of the shaft were more intensively quenched by an increased gas flow so that the hardness profiles were equalized and the residual stresses at the edges were significantly reduced.Keywords

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Calculation of transformation sequences in quenched steel components to help predict internal stress distribution

Cited by 2 publications

References 5 publications

Residual Stresses in Case Hardened Materials

Residual Stresses in Case Hardened Materials

Minimizing Stress and Distortion for Shafts and Discs by Controlled Quenching in a Field of Nozzles

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