COMPOSITION DESIGN OF HIGH–STRENGTH MARTENSITIC PRECIPITATION HARDENING STAINLESS STEELS BASED ON A CLUSTER MODEL
WANG Qing 1,2, ZHA Qianfeng 1,2, LIU Enxue 1,2, DONG Chuang 1,2, WANG Xuejun 3,TAN Chaoxin 3, JI Chunjun 4
1. Key Laboratory of Materials Modification of Ministry of Education, Dalian University of Technology, Dalian 116024
2. School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024
3. Shenyang Blower Works Group Corporation, Shenyang 110869
4. School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024
Cite this article:
WANG Qing ZHA Qianfeng LIU Enxue DONG Chuang WANG Xuejun TAN Chaoxin JI Chunjun. COMPOSITION DESIGN OF HIGH–STRENGTH MARTENSITIC PRECIPITATION HARDENING STAINLESS STEELS BASED ON A CLUSTER MODEL. Acta Metall Sin, 2012, 48(10): 1201-1206.
The present work investigates composition characteristics of martensitic precipitation hardening stainless steels using a cluster–plus–glue–atom model. In this kind of steels based on the basic ternary Fe–Ni–Cr, the lowest solubility limit of high–temperature austenite corresponds to the cluster formula [NiFe12]Cr3, where NiFe12 is a cuboctahedron centered by Ni and surrounded by 12 Fe atoms in fcc structure and Cr serves as glue atoms. New multi–component alloys were designed by adding C, Mo, Nb and Cu into the basic [NiFe12]Cr3 with self–magnification of cluster formula and similar element substitution. These alloys were prepared by copper mould suction casting method, then solid–solution treated at 1323 K for 2 h followed by water–quenching, and finally aged 753 K for 4 h. The experimental results show that the microstructures and properties of the serial solid–solution treated and aged alloys vary with alloying elements and their contents. Among them, the {[(Ni13Cu3)Fe192](Cr45Mo2.5Nb0.5)}C1 alloy has higher microhardness and tensile strengths, the hardness is 397 HV, yield strength is 971 MPa and ultra strength is 1093 MPa after aging treatment. {[(Ni13Cu3)Fe192](Cr45Mo2.5Nb0.5)}C1 exhibits good corrosion–resistance in 3.5%NaCl solution.
[1] Zhao X C, Song W S, Yang Z Y, Liang J X, Li W H. High Strength and Super–high Strength Stainless Steels. Beijing: Metallurgical Industry Press, 2008: 244
