The role of alloying elements in NiAl and Ni3Ti strengthened Co-free maraging steels

被引：10
|
作者：
Zeisl, S. [1 ]
Landefeld, A. [1 ]
Van Steenberge, N. [2 ]
Chang, Y. [3 ]
Schnitzer, R. [1 ]
机构：
[1] Univ Leoben, Dept Mat Sci, Franz Josef Str 18, Leoben, Austria
[2] OnderzoeksCentrum Aanwending Staal, Technol Pk Techlane A4C, B-9052 Zwijnaarde, Belgium
[3] Rhein Westfal TH Aachen, Steel Inst, Intzestr 1, D-52072 Aachen, Germany
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2022年 / 861卷
关键词：
Maraging steels; Atom probe tomography; Alloy design; X-ray diffraction; Intermetallic precipitates; MECHANICAL-PROPERTIES; AGING TEMPERATURE; PRECIPITATION BEHAVIOR; AUSTENITE REVERSION; REVERTED AUSTENITE; MARTENSITE; MICROSTRUCTURE;
D O I：
10.1016/j.msea.2022.144313
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Some precipitation hardened steels use a combination of the intermetallic eta-NiAl and beta-Ni3Ti phases to achieve a beneficial combination of ultra-high strength and toughness. The age-hardening in such steels is a complex process that includes the simultaneous formation of precipitates and reverted austenite. The phase constitution and volume fraction of the precipitates strongly depends on the content of the alloying elements, such as Ti, Al, Cr and Mo. By using a step-wise alloy design scheme and high-resolution characterization methods this study seeks to reveal the influence of Ti and Al variations as well as of Cr and Mo on the precipitation hardening and austenite reversion for Co-free maraging steels based on the Fe-12Ni alloy system. It was found that Cr plays a major role in promoting the precipitation of the eta-Ni3Ti phase and simultaneously increases strength and toughness, Ti and Al variations can change the balance between. eta-Ni3Ti and beta-NiAl precipitates and Mo significantly promotes austenite reversion.
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页数：9
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