Precipitation sequence and its effect on age hardening of alumina-forming austenitic stainless steel

被引：47
作者：
Moon, Joonoh [1 ]
Lee, Tae-Ho [1 ]
Heo, Yoon-Uk [2 ]
Han, Young-Soo [3 ]
Kang, Jun-Yun [1 ]
Ha, Heon-Young [1 ]
Suh, Dong-Woo [2 ]
机构：
[1] Korea Inst Mat Sci, Adv Metall Mat Div, Ferrous Alloy Dept, Chang Won 642831, Gyeongnam, South Korea
[2] Pohang Univ Sci & Technol, Grad Inst Ferrous Technol, Gyeongbuk 790784, South Korea
[3] Korea Atom Energy Res Inst, Div Neutron Sci, Taejon 305353, South Korea
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2015年 / 645卷
关键词：
Alumina-forming austenitic (AFA) steel; Ageing; Precipitation behavior; Gleeble hot tension test; MECHANICAL-PROPERTIES; MICROALLOYED STEEL; CREEP RESISTANCE; MICROSTRUCTURE; TEMPERATURE; BEHAVIOR; STRENGTH; ALLOYS; PHASE;
D O I：
10.1016/j.msea.2015.08.005
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The precipitation sequence during ageing of Fe-14Cr-20Ni-0.9Nb-2.5Al based alumina-forming austenitic (AFA) steel was explored through a transmission electron microscopy analysis and a small angle neutron scattering experiment. The samples were aged at 700 degrees C for up to 504 h. Particles of NbC, M23C6 and Ni3Al-type L1(2) were observed in the early stage of ageing. Metastable L1(2) particles were-formed both in grain interior and along grain boundary. M23C6 carbides precipitated along grain boundary accompanied with precipitation of L1(2) particles. After ageing for longer than 48 h, particles of B2-NiAl and Laves-Fe2Nb were newly formed. We suggest the possibility of phase transition from L1(2) to B2 with increase in ageing time. Finally, this study examined the change of mechanical properties during ageing through a Gleeble hot tension test and a Vickers hardness test, and then the relationship between precipitation behavior and mechanical properties was carefully investigated and discussed in terms of precipitation behavior. (C) 2015 Elsevier B.V. All rights reserved.
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页码：72 / 81
页数：10
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