21/4 Cr-1Mo 鋼溶接部の静的, 動的破壊靭性値に及ぼす熱処理の影響

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Dynamic fracture toughness K_<Id> is generally considered as one of the most important mechanical properties, but it is not so easy to obtain K_<Id>. While statical fracture toughness is easily obtained comparatively. If the relation between K_<Ic> and K_<Id> can be cleared, it may be very useful for engineering. In this paper, the temperature dependence of K_<Ic> and K_<Id> of 2 1/4 Cr-1Mo steel weld joint were investigated at both states of as weld and as heat treated. Furthermore, the correlations between Charpy impact value C_v and K_<Ic>, K_<Id> were studied. Main results obtained are as follows. (1) K_<Ic> and K_<Id> values as weld state are considerably low, and their increasing ratios as temperature rise are little. But by heat treatment, the former are improved remarkably and the latter are increased. (2) The temperature dependence curves of K_<Id> are located at the temperatures which shifted parallelly those of K_<Ic> to their higher sides. The amounts of shifts determined by the section transition temperatures of C_v tests are over a range of 74∿84℃. (3) The temperature dependence curves of K_<Ic>, K_<Id> and C_v are shifted to lower sides by heat treatment. The amounts of shifts determined by the transition temperatures show some differences between the locations of weld joint, but coincide considerably well so far as any one location concerns. (4) The formula representing the correlation between C_v and K_<Ic>, K_<Id> are presented.
社団法人溶接学会の論文
1979-11-05

21/4 Cr-1Mo 鋼溶接部の静的, 動的破壊靭性値に及ぼす熱処理の影響

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