2・1/4Cr-1Mo 鋼の高温強度におよぼす焼もどしおよび応力除去焼なまし条件の影響(高温の組織と強度)(<特集>耐熱鋼・耐熱合金)

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To clarify the effects of tempering and stress relieving heat treatments on elevated temperature strength of 2・1/4Cr-1Mo steel, tensile test and creep rupture test were carried out. Specimens were normalized and tempered at 640°∿760℃ or normalized and tempered at 680℃ and subsequently stress relieved at 640°∿720℃. Change in the substructure of specimens during creep rupture test was examined through electron microscope using extracted replicas. Results obtained are as follows. 1) Elevated temperature tensile strength of stress relieved specimen decreases monotonously with the increase in the tempering parameter (T.P.) of the stress relief treatment. On the contrary, that of tempered specimen becomes independent of T.P. in the range of T.P. beyond about 19.5×10^3. 2) Larson-Miller's master rupture curves for stress relieved specimens and for tempered (680℃) specimen change monotonously, but those for normalized specimen and for tempered (640°, 720° and 760℃) specimens show a tendency to shift to higher stress in the range of the Larson-Miller's parameter (P_<L.M.>) below about 18.5×10^3. 3) In high P_<L.M.> range creep rupture stress decreases with the increase in the T.P. subjected to the specimen. At a critical P_<L.M.> which is roughly equal to the T.P. of that specimen master rupture curve converges into the curve for normalized specimen. 4) The change in the density of needle-like carbide during tempering or stress relieving heat treatments and also during creep rupture test roughly corresponds with the change in the master rupture strength of each specimen.
社団法人日本鉄鋼協会の論文
1979-06-01

2・1/4Cr-1Mo 鋼の高温強度におよぼす焼もどしおよび応力除去焼なまし条件の影響(高温の組織と強度)(<特集>耐熱鋼・耐熱合金)

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