발간논문

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Vol.19, No.3, 208 ~ 218, 1981
Title
The Effect of Thermal Cycling Treatments on the Microstructures and mechanical Properties of AISI 4330 Steel
김태일Tae Il Kim, 천성순Soung Soon Chun
Abstract
Thermal Cycling treatments have been applied to AISI 4330 steel for improving the strength and impact toughness. The constant and alternate cycling have been applied. Experimental results showed that a remarkable grain refinement can be obtained by thermal cycling treatments. The strength and impact value were increased by constant cycling, but the strength tended to decrease with increasing the impact value in alternate cycling. It was found that the best thermal cycling condition was the fourth cycle of constant cycling, and the grain size was reduced from about 15∼20㎛ mean grain diameter to 2∼3㎛, by this treatment. The grain refinement can be attributed to the low austenitizing temperature and short soaking time due to the rapid heating rate and the accumulation of residual stress during repeated thermal cycling. It is believed that the increase in strength is caused by the grain refinement and fine carbide precipitation, and increase in impact value is mainly due to the reduction of plate martensite which deteriorates the toughness.
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