COMPOSITION DESIGN OF HIGH-STRENGTH MARTENSITIC PRECIPITATION HARDENING STAINLESS STEELS BASED ON A CLUSTER MODEL
COMPOSITION DESIGN OF HIGH-STRENGTH MARTENSITIC PRECIPITATION HARDENING STAINLESS STEELS BASED ON A CLUSTER MODEL
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DOI：
10.3724/sp.j.1037.2012.00053
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发表时间：
2012-10-11
影响因子：
2.3
通讯作者：
Ji Chunjun
中科院分区：
文献类型：
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作者：
Wang Qing;Zha Qianfeng;Ji Chunjun
采用原子团加胶原子模型研究了马氏体沉淀硬化不锈钢的成分特征。在这类以Fe-Ni-Cr为基本三元组元的钢中，高温奥氏体的最低固溶极限对应于原子簇式[NiFe 12]Cr-3，其中NiFe 12是一个以Ni为中心，由12个Fe原子包围的立方八面体，呈面心立方结构，Cr是粘结原子。通过在[NiFe 12]Cr-3基合金中添加C、Mo、Nb和Cu，利用原子簇自放大公式和相似元素替代设计了新型多元合金。采用铜模吸铸法制备合金，在1323 K固溶2 h后水淬，最后在753 K时效4 h。实验结果表明，固溶时效系列合金的组织和性能随合金元素及其含量的变化而变化。其中，{[（Ni 13 Cu 3）Fe-192]（Cr45MO2.5Nb0.5）}C-1合金具有较高的显微硬度和抗拉强度，时效后硬度为397 RV，屈服强度为971 MPa，超强度为1093 MPa。{[（Ni 13 Cu 3）Fe-192]（Cr45Mo2.5Nb0.5）}C-1在3.5%NaCl溶液中具有良好的耐蚀性。
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]Cr-3, 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]Cr-3 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)Fe-192](Cr45MO2.5Nb0.5)}C-1 alloy has higher microhardness and tensile strengths, the hardness is 397 RV, yield strength is 971 MPa and ultra strength is 1093 MPa after aging treatment. {[(Ni13Cu3)Fe-192](Cr45Mo2.5Nb0.5)}C-1 exhibits good corrosion-resistance in 3.5%NaCl solution.