THE EFFECT OF TI CONTENTS ON THE AMOUNTS OF INCLUSIONS FORMATION AND MECHANICAL PROPERTIES OF C۳۰۰ HIGH STRENGTH STEEL

In this research the influence of Ti contents on the amounts of inclusions formation and mechanical properties of a high alloy high strength steel, C۳۰۰, has been investigated. For this purpose several bars were casted under the same solidification conditions, but different amounts of Ti element. All the seven casted bars were homogenized at ۱۲۰۰°C for a period of ۲ hours. Then, they were immediately hot rolled after homogenization so that the out rolling temperature was kept in the range of ۱۰۰۰-۱۲۰۰° C. The specimens were then solution annealed at ۸۲۰°C for hour and finally they were aged for a period of ۳ hours at ۵۰۰°C. The samples were subjected to tensile, impact and hardness tests in order to relate the variation in volume percent of inclusions due to different amount of Ti, to mechanical properties. The results showed that by increasing the amount of Ti a serious decline in toughness properties of the alloy due to increase in inclusion population occurred. So this research provides a very useful information about the relation between volume fraction of inclusions and mechanical properties of a C۳۰۰ high strength steel.

کلیدواژه ها:

HIGH STRENGTH STEEL ، INCLUSION ، TI CONTENTS ، CASTING ، MECHANICAL PROPERTIES ، MARAGING C۳۰۰۰