Fe-Ni-Co-Ti合金中弥散析出的γ′粒子对马氏体形态的影响

INFLUENCE OF DISPERSED γ′ ECIPITATEDPARTICLES ON MARTENSITE MORPHOLOGY IN Fe-Ni Co-Ti ALLOYS

Fe-Ni-Co-Ti合金中弥散析出的γ′粒子,当直径在20—50nm时,低温下生成的马氏体具有薄片状马氏体特征;由于γ′粒子的钉扎作用,马氏体界面不光滑.当γ′粒子直径小于5nm时,低温下生成具有良好热弹性的薄片状马氏体;当γ′粒子直径大于5nm,出现断续状马氏体,而且随γ′粒子的长大,断续状马氏体变大,数量增多.当γ′粒子直径为10—15nm时,低温下生成透镜状或蝶状马氏体。

The martensite is featured as thin plate when the γ′dispersed precipi- tated particles are the size of about 20--50 nm formed at low temperature in Fe- iN-Oo-Ti alloys. The interface of martensite plate is not smooth. If the γ′particles are sized less than 5 nm, the thin plate martensite with thermoelasticity may be found at low temperature, while greater than 5 nm, the intermittent martensite may occur, and increase both in size and quantity with the coarsening of the γ′parti- cles. The lenticular or butterfly martensite is formed at low temperature until the γ′particles up to 10--15 nm.