蒸気タービン軸用Cr-Mo-V鋼の熱処理とクリープ破断強度について : 高温強度特集号

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Cr-Mo-V steel is widely used for h-p and i-p steam turbine shafts among many high temperature low alloy steels. And it has been recognized by our creep rupture test results of a number of steam turbine shafts that the creep rupture properties of large-sized Cr-Mo-V steam turbine shafts cover a considerably wide range. It is considered that this variance of the creep rupture properties is caused by the variance of the steel making procedures in a limited sense, that is the imperceptible differences of the melting practice, chemical composition, and heat treatment. To make clear the roles of these variables, a test program has been putting forword. The effects of tempering temperature on the creep rupture strength of a Cr-Mo-V steel is presented here. A Cr-Mo-V steel was austenitized at 950℃ for 2 h and cooled in a furnace at a rate of 100℃/h, followed by the tempering at 650℃, 675℃ and 700℃ for 3 h. The micro structures were tempered bainite containing a little fraction of ferrite precipitates instead of the fully bainitic structure of actual shafts. The experiments were consisted of the creep rupture test, tensile test and V-notch Charpy impact test for the estimation of the fracture transition temperature. The creep rupture test was conducted with plain and notched bar specimen and the test results were arranged with Larson-Miller's parameter. The tensile test was conducted at room temperature and 538℃.
社団法人日本材料学会の論文
1962-03-15

蒸気タービン軸用Cr-Mo-V鋼の熱処理とクリープ破断強度について : 高温強度特集号

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