The current status of nitrogen containing stainless steels at home and aboard has been introduced. The function and existing forms of nitrogen in the stainless steels, influence of nitrogen on mechanical properties an...The current status of nitrogen containing stainless steels at home and aboard has been introduced. The function and existing forms of nitrogen in the stainless steels, influence of nitrogen on mechanical properties and anti-corrosion properties as well as the application of nitrogen containing cast stainless steels were discussed in this paper. It is clear that nitrogen will be a potential and important alloying element in stainless steels. And Argon Oxygen Decarbonization (AOD) refining can provide an advanced manufacture process for nitrogen containing stainless steels with ultra-low- carbon and high cleanliness.展开更多
In this article, the microstructure, hardness, and corrosion resistance of the Al0.3CrFe1.5MnNi0.5Tixand Al0.3CrFe1.5MnNi0.5Six（x = 0, 0.2, 0.5, 1.0） high-entropy alloys were investigated via X-ray diffraction（XRD...In this article, the microstructure, hardness, and corrosion resistance of the Al0.3CrFe1.5MnNi0.5Tixand Al0.3CrFe1.5MnNi0.5Six（x = 0, 0.2, 0.5, 1.0） high-entropy alloys were investigated via X-ray diffraction（XRD）scanning electron microscopy（SEM）, digital display Vickers hardness tester, and electrochemical technique These alloys are mainly composed of BCC solid-solution structure. When adding high content of Ti or Si elemen（x C 0.5）, some intermetallic compounds are found in the microstructure, which makes the alloys have a high hardness, high brittleness, and easy cracking. While the alloys with low content of Ti or Si（x = 0.2） have a hardness of HV 420–HV 430, and its hardness increases about 14 %compared with that of Al0.3CrFe1.5MnNi0.5. Electrochemical results in 3.5 % NaCl solution show that the alloying elements Ti and Si have a negative influence on the corrosion resistance of the Al0.3CrFe1.5MnNi0.5alloys.展开更多
镁是密排六方结构金属,滑移系较少,其基面滑移阻力比柱面和锥面滑移阻力低很多,基面滑移启动后其他滑移系很难启动,导致镁合金室温和低温的塑性变形能力较差。重庆大学等单位研究发现某些特定原子固溶在镁中既能阻碍基面位错滑移提高强...镁是密排六方结构金属,滑移系较少,其基面滑移阻力比柱面和锥面滑移阻力低很多,基面滑移启动后其他滑移系很难启动,导致镁合金室温和低温的塑性变形能力较差。重庆大学等单位研究发现某些特定原子固溶在镁中既能阻碍基面位错滑移提高强度,又能通过缩小基面与非基面滑移阻力差距促进非基面滑移开启而改善塑性,达到同时提高镁合金强度和塑性的目的。重庆大学镁合金科研团队把这一结果发展为"镁合金固溶强化增塑"合金设计理论(Solid solution strengthening and ductilizing,SSSD)。这一合金设计理论在过去十几年中已成为解决镁合金强度和塑性平衡优化的一条新途径。重庆大学应用该理论开发了多种新型高性能镁合金,其中10多个新合金已批准为国家标准牌号合金和国际标准牌号合金。展开更多
文摘The current status of nitrogen containing stainless steels at home and aboard has been introduced. The function and existing forms of nitrogen in the stainless steels, influence of nitrogen on mechanical properties and anti-corrosion properties as well as the application of nitrogen containing cast stainless steels were discussed in this paper. It is clear that nitrogen will be a potential and important alloying element in stainless steels. And Argon Oxygen Decarbonization (AOD) refining can provide an advanced manufacture process for nitrogen containing stainless steels with ultra-low- carbon and high cleanliness.
基金financially supported by the Post-doctoral Scientific Research Foundation of Zhengzhou UniversityPost-doctoral Scientific Research Foundation of China(No.2013M541986)
文摘In this article, the microstructure, hardness, and corrosion resistance of the Al0.3CrFe1.5MnNi0.5Tixand Al0.3CrFe1.5MnNi0.5Six（x = 0, 0.2, 0.5, 1.0） high-entropy alloys were investigated via X-ray diffraction（XRD）scanning electron microscopy（SEM）, digital display Vickers hardness tester, and electrochemical technique These alloys are mainly composed of BCC solid-solution structure. When adding high content of Ti or Si elemen（x C 0.5）, some intermetallic compounds are found in the microstructure, which makes the alloys have a high hardness, high brittleness, and easy cracking. While the alloys with low content of Ti or Si（x = 0.2） have a hardness of HV 420–HV 430, and its hardness increases about 14 %compared with that of Al0.3CrFe1.5MnNi0.5. Electrochemical results in 3.5 % NaCl solution show that the alloying elements Ti and Si have a negative influence on the corrosion resistance of the Al0.3CrFe1.5MnNi0.5alloys.
文摘镁是密排六方结构金属,滑移系较少,其基面滑移阻力比柱面和锥面滑移阻力低很多,基面滑移启动后其他滑移系很难启动,导致镁合金室温和低温的塑性变形能力较差。重庆大学等单位研究发现某些特定原子固溶在镁中既能阻碍基面位错滑移提高强度,又能通过缩小基面与非基面滑移阻力差距促进非基面滑移开启而改善塑性,达到同时提高镁合金强度和塑性的目的。重庆大学镁合金科研团队把这一结果发展为"镁合金固溶强化增塑"合金设计理论(Solid solution strengthening and ductilizing,SSSD)。这一合金设计理论在过去十几年中已成为解决镁合金强度和塑性平衡优化的一条新途径。重庆大学应用该理论开发了多种新型高性能镁合金,其中10多个新合金已批准为国家标准牌号合金和国际标准牌号合金。
