出 处:《Rare Metals》2014年第6期761-766,共6页稀有金属(英文版)
基 金:financially supported by the Fundamental Research Funds for the Central Universities (No. N100602011);the National Natural Science Foundation of China (No. 51104039);the National Key Basic Research Program of China (No. 2012CB626812);the Program for New Century Excellent Talents in University (No. NCET-11-0077);Liaoning Provincial Natural Science Foundation of China (No. 201102062);Liaoning Provincial Science and Technology Plan (No. 2012221013);the National Innovation Experiment Program for University Students
摘 要:As the raw materials in the post process of rolling and heat treatment, ingots have great effects on the properties of the final products. Inclusions and solidification structures are the most important aspects of the quality of ingots. Niobium and titanium are usually used to react with carbon and nitrogen to improve the properties of ferritic stainless steels. In this research, combined with thermodynamic calculation, effects of niobium and titanium on the inclusions and solidification structures in three kinds of high pure ferritic stainless steels with different titanium additions were investigated by optical microscope(OM), scanning electron microscope(SEM), transmission electron microscope(TEM), and energy disperse spectrometer(EDS). Results show that Al2O3 and a few(Nb,Ti)N particles form when titanium addition is 0.01 %.Furthermore, inclusions are mainly Ti N and Al2O3–Ti Ox–Ti N duplex inclusions when titanium addition is more than0.10 %. Those two types of inclusions are in well distribution, and can afford nuclei to the solidification process.Therefore, the ratio of equiaxed zone increases with the increase of titanium addition. The ratio increases from42.1 % to 64.0 % with the titanium addition increasing from 0.01 % to 0.10 %, and it increases to 85.7 % when the titanium addition reaches 0.34 %.As the raw materials in the post process of rolling and heat treatment, ingots have great effects on the properties of the final products. Inclusions and solidification structures are the most important aspects of the quality of ingots. Niobium and titanium are usually used to react with carbon and nitrogen to improve the properties of ferritic stainless steels. In this research, combined with thermodynamic calculation, effects of niobium and titanium on the inclusions and solidification structures in three kinds of high pure ferritic stainless steels with different titanium additions were investigated by optical microscope(OM), scanning electron microscope(SEM), transmission electron microscope(TEM), and energy disperse spectrometer(EDS). Results show that Al2O3 and a few(Nb,Ti)N particles form when titanium addition is 0.01 %.Furthermore, inclusions are mainly Ti N and Al2O3–Ti Ox–Ti N duplex inclusions when titanium addition is more than0.10 %. Those two types of inclusions are in well distribution, and can afford nuclei to the solidification process.Therefore, the ratio of equiaxed zone increases with the increase of titanium addition. The ratio increases from42.1 % to 64.0 % with the titanium addition increasing from 0.01 % to 0.10 %, and it increases to 85.7 % when the titanium addition reaches 0.34 %.
关 键 词:High pure ferritic stainless steel Inclusion Solidification structure Equiaxed zone Stabilization element
分 类 号:TG142.71[一般工业技术—材料科学与工程] TG146.21[金属学及工艺—金属材料]
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...