Microstructure and mechanical properties of a 2000 MPa Co-free maraging steel after aging at 753 K

被引：26
作者：
He, Y [1 ]
Yang, K
Sha, W
Cleland, DJ
机构：
[1] Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
[2] Delft Univ Technol, Mat Sci Lab, NL-2628 AL Delft, Netherlands
[3] Queens Univ Belfast, Met Res Grp, Sch Civil Engn, Belfast BT7 1NN, Antrim, North Ireland
来源：
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2004年 / 35A卷 / 09期
关键词：
D O I：
10.1007/s11661-004-0221-6
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The precipitation kinetics at the aging temperature of 753 K in a 2000 MPa grade Co-free maraging steel (Fe-18.9Ni-4.1Mo-1.9Ti, wt pet) has been studied. Under the peak-aged condition at 753 K, Ni3Ti precipitates of moderate size were uniformly distributed in the martensite matrix, leading to optimal combination of strength (2000 MPa of yield strength) and fracture toughness (70 MParootm). The ultra-high strength of the maraging steel subjected to long time aging at 753 K is attributed to the high resistance to coarsening of precipitates. The orientation relationship between martensite and Ni3Ti was observed as (011)(M)//(0001)(eta-Ni3Ti) and [111]M//[1120](eta-Ni3Ti). The Orowan mechanism is the dominant strengthening mechanism.
引用
收藏
页码：2747 / 2755
页数：9
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