Mechanical Properties and Microstructures of Warm-Extruded 0.43% Carbon Steels

The purpose of this study is to clarify the optimum approach to obtain high tensile strength after warm working, without increasing warm deformation resistance during warm working of medium carbon steel. Increase in warm deformation resistance during warm working by addition of Cr is small. On the other hand, Cr has the effect of suppressing the annihilation of dislocations in the air cooling process after warm working. Thus, by adding Cr, the tensile strength after warm working is effectively improved, without increasing warm deformation resistance during warm working. Increasing of Si is effective as a method to obtain high tensile strength after warm working, without increasing warm deformation resistance during warm working, too. Si has an effect of the solid solution hardening. This effect by increasing Si is due to the large temperature dependence of solid solution hardening effect. The control of microstructural factors, that are pearlite fraction and cementite spacing, is not effective as a method to obtain high tensile strength after warm working, without increasing warm deformation resistance during warm working.

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Effects of Strengthening Factors on Tensile Strength of Warm-Worked Middle Carbon Steels

Ochi¹,

Yamasaki²,

Monden³

et al. 2012

Tetsu-to-Hagane

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緒言The purpose of this research is to clarify the effects of strengthening factors on tensile strength of warm-worked middle carbon steels. The increase in the tensile strength of warm-worked products is realizable by increasing tensile strength of steel before warm-working and work hardening by warm-working. As a strengthening method of warm-worked products by material strengthening, solid solution hardening is effective. Specifically, addition of Si is effective. As a strengthening method of warm-worked products by work hardening, low-temperature working is effective. Also the addition of elements such as Cr which inhibits the annihilation of dislocations can strengthen warm-worked products through increasing work hardening. Material strengthening by decreasing cementite spacing, etc. is less effective in strengthening of warm-worked products. This is by that plate-like cementites are changed to granular ones by warm-working.

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Mechanical Properties and Microstructures of Warm-Extruded 0.43% Carbon Steels

Cited by 4 publications

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Microstructures of deformation and fracture of cementite in pearlitic carbon steels strained at various temperatures

Microstructures of deformation and fracture of cementite in pearlitic carbon steels strained at various temperatures

Deformation Resistance during Warm Working and Strength of Warm-Worked Products of Middle Carbon Steels

Effects of Strengthening Factors on Tensile Strength of Warm-Worked Middle Carbon Steels

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