18Ni マルエージ鋼の引張特性におよぼす時効中の組織変化とオーステナイト結晶粒度の影響

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A study has been made of the effects of structural change during aging, the prior austenitic grain size and titanium addition on the tensile properties with special reference to tensile ductility of 18Ni maraging steel. The precipitation process from lath-martensitic structure to maraged structure of several stages up to overaged structure has been analyzed by using Arrhenius plots of aging hardness. The relationships between the aged structure and tensile properties have been determined. The results are summarized as follows : 1) Uniform elongation increases markedly at an early stage of aging and also in overaged stage. This phenomenon is attributable to the increase of work hardening caused by the change of deformation made at former stage and γ precipitation at later stage respectively. Uniform elongation is almost independent on the prior austenite grain size. 2) Local elongation and reduction of area decrease monotonously with increasing aging time, and show a marked decrease in overaged structure. These detrimental effects are more pronounced when the prior austenite grain size is larger and no titanium is added. 3) The detrimental effects exhibited in overaged stage are due to the increase of void nucleation sites and increase of tendency to rupture along the prior austenite grain boundaries. 4) The improvement of local elongation and reduction of area by titanium addition is due to the suppression of the rupture at the prior austenite grain boundaries.
社団法人日本鉄鋼協会の論文
1973-09-01

18Ni マルエージ鋼の引張特性におよぼす時効中の組織変化とオーステナイト結晶粒度の影響

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