9Cr-1Mo-V-Nb 鋼の機械的性質に及ぼす加工熱処理の影響(<特集>新しい耐熱鋼)

概要

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An extensive study has been made on the effect of rolling condition on recrystallization of austenite, dissolution behavior of alloying elements and mechanical properties of 9Cr-1Mo-V-Nb steel. Thereafter, metallurgical factors for improving mechanical properties have been investigated and a suitable rolling condition for thermo-mechanical control process was determined. The results obtained are as follows. 1) In the higher slab reheating temperature, especially above 1200℃, dissolution of Nb is accelerated and creep rupture strength increases. 2) The recrystallization in hot working occurs above 1000℃, and makes fine grain structure, thereby improves toughness of the steel. 3) Recovery is mostly completed in the steel rolled at the non-recrystallizing region above 900℃. The steel shows higher resistance to the softening by tempering. 4) However, in the steel rolled at non-recrystallizing region below 900℃, there is a fear of decrease in tensile and creep rupture strength. 5) Suitable mechanical properties according to the required material specification can be obtained by thermo-mechanical control process through controlling precipitation behavior.
社団法人日本鉄鋼協会の論文
1990-07-01