The thermal fatigue property of Cr-W-Mo-Ni-Mn-RE ferric-base hardfacing layer was investigated. The results show that the generation and propagation of thermal fatigue cracks prefer the parts of oxidation and etching ...The thermal fatigue property of Cr-W-Mo-Ni-Mn-RE ferric-base hardfacing layer was investigated. The results show that the generation and propagation of thermal fatigue cracks prefer the parts of oxidation and etching of the grain boundary, the joint efforts of cycle stress and oxidation at high temperatures are the main factors in the generation and propagation of thermal fatigue cracks. When the temperatures is below 600 ℃, the Cr-W-Mo-Ni-Mn-RE ferric-base hardfacing layer has higher ability of thermal fatigue resistance. The function of the alloy and rare earth elements was discussed.展开更多
In this work,eight Mn-RE(RE=Ce,Pr,Sm,Tb,Er,Tm,Lu,and Y)binary systems were reassessed thermodynamically by the CALPHAD method based on the reported optimizations and experimental information.Self-consistent thermodyna...In this work,eight Mn-RE(RE=Ce,Pr,Sm,Tb,Er,Tm,Lu,and Y)binary systems were reassessed thermodynamically by the CALPHAD method based on the reported optimizations and experimental information.Self-consistent thermodynamic parameters to describe Gibbs energies of various phases in eight Mn-RE binary systems were obtained.The calculated phase equilibria and thermodynamic properties of eight Mn-RE binary systems are in good accor-dance with the experimental results.Furthermore,phase equilibria and ther-modynamic properties of 13 Mn-RE(RE=La,Ce,Pr,Nd,Sm,Gd,Tb,Dy,Ho,Er,Tm,Lu,and Y)binary systems were discussed systematically in combination with the present calculations and the reported optimizations.A trend was found for the variation of phase equilibria and thermodynamic properties of the Mn-RE binary systems.In general,as the RE atomic number increases,the enthalpies of mixing of liquid alloys as well as the enthalpies of formation of the intermetallic compounds become increasingly negative,and the formation temperatures of the intermetallic compounds become higher.The results provide a complete set of self-consistent thermodynamic parameters for the Mn-RE binary systems,and a thermodynamic database of 13 Mn-RE binary systems was finally achieved.展开更多
用氩弧将铁、镍、稀土、锰直接或间接熔入铝硅合金表面 ,研究这些元素对含铁量为1 0 3%～ 6 .92 %的焊缝中铁相形态的影响。研究发现 ,稀土含量低时可抑制针状铁相 ;稀土含量大于一定量就会生成针状的Al Si Re Ni Fe相 ,该针状相的长度...用氩弧将铁、镍、稀土、锰直接或间接熔入铝硅合金表面 ,研究这些元素对含铁量为1 0 3%～ 6 .92 %的焊缝中铁相形态的影响。研究发现 ,稀土含量低时可抑制针状铁相 ;稀土含量大于一定量就会生成针状的Al Si Re Ni Fe相 ,该针状相的长度随稀土含量的增加而增加。铝硅合金中加入铁、锰、稀土后 ,熔敷金属中出现四瓣状Al Si Mn Fe相。若加入等量的Fe、Ni,熔敷金属中会形成间断的Al Si Fe Ni网状组织 ;若同时加入锰 ,除了生成网状结构外 ,还会同时存在四瓣状Al Si Mn Fe相和三瓣状的Al Si Mn Fe Ni相。在铝硅合金中 ,单独加镍、同时加稀土和镍、同时加稀土和锰、同时加锰和镍均可很好地抑制针状铁相。锰、镍抑制针状铁相的效果明显优于稀土。展开更多
The effects of the addition of 0.6%Ca（mass fraction） on the as-cast microstructure and mechanical properties of the Mg-3Ce-1.2Mn-0.9Sc and Mg-4Y-1.2Mn-0.9Sc magnesium alloys were investigated and compared by optical...The effects of the addition of 0.6%Ca（mass fraction） on the as-cast microstructure and mechanical properties of the Mg-3Ce-1.2Mn-0.9Sc and Mg-4Y-1.2Mn-0.9Sc magnesium alloys were investigated and compared by optical microscopy and scanning electron microscopy,differential scanning calorimetry analysis,and tensile and creep tests.The results indicate that the addition of 0.6%Ca to the Mg-3Ce-1.2Mn-0.9Sc and Mg-4Y-1.2Mn-0.9Sc alloys can refine the grains of the two alloys.At the same time,the addition of 0.6%Ca to the Mg-3Ce-1.2Mn-0.9Sc and Mg-4Y-1.2Mn-0.9Sc alloys can effectively improve the tensile properties of the two alloys.In addition,the addition of 0.6%Ca can also improve the creep properties of the Mg-3Ce-1.2Mn-0.9Sc alloy but is not beneficial to the creep properties of the Mg-4Y-1.2Mn-0.9Sc alloy.The different effects of minor Ca on the creep properties of the Mg-3Ce-1.2Mn-0.9Sc and Mg-4Y-1.2Mn-0.9Sc alloys are possibly related to the difference in the solid solubilities of Ce and Y in Mg.展开更多
文摘The thermal fatigue property of Cr-W-Mo-Ni-Mn-RE ferric-base hardfacing layer was investigated. The results show that the generation and propagation of thermal fatigue cracks prefer the parts of oxidation and etching of the grain boundary, the joint efforts of cycle stress and oxidation at high temperatures are the main factors in the generation and propagation of thermal fatigue cracks. When the temperatures is below 600 ℃, the Cr-W-Mo-Ni-Mn-RE ferric-base hardfacing layer has higher ability of thermal fatigue resistance. The function of the alloy and rare earth elements was discussed.
基金supported financially by Guangxi Natural Science Foundation(2020GXNSFFA297004)National Natural Science Foundation of China(51971069,51461013,51761008)+1 种基金Guangxi Key Laboratory of Information Materials(211007-Z)Engineering Research Center of Electronic Information Materials and Devices(EIMDAA202004)。
文摘In this work,eight Mn-RE(RE=Ce,Pr,Sm,Tb,Er,Tm,Lu,and Y)binary systems were reassessed thermodynamically by the CALPHAD method based on the reported optimizations and experimental information.Self-consistent thermodynamic parameters to describe Gibbs energies of various phases in eight Mn-RE binary systems were obtained.The calculated phase equilibria and thermodynamic properties of eight Mn-RE binary systems are in good accor-dance with the experimental results.Furthermore,phase equilibria and ther-modynamic properties of 13 Mn-RE(RE=La,Ce,Pr,Nd,Sm,Gd,Tb,Dy,Ho,Er,Tm,Lu,and Y)binary systems were discussed systematically in combination with the present calculations and the reported optimizations.A trend was found for the variation of phase equilibria and thermodynamic properties of the Mn-RE binary systems.In general,as the RE atomic number increases,the enthalpies of mixing of liquid alloys as well as the enthalpies of formation of the intermetallic compounds become increasingly negative,and the formation temperatures of the intermetallic compounds become higher.The results provide a complete set of self-consistent thermodynamic parameters for the Mn-RE binary systems,and a thermodynamic database of 13 Mn-RE binary systems was finally achieved.
文摘用氩弧将铁、镍、稀土、锰直接或间接熔入铝硅合金表面 ,研究这些元素对含铁量为1 0 3%～ 6 .92 %的焊缝中铁相形态的影响。研究发现 ,稀土含量低时可抑制针状铁相 ;稀土含量大于一定量就会生成针状的Al Si Re Ni Fe相 ,该针状相的长度随稀土含量的增加而增加。铝硅合金中加入铁、锰、稀土后 ,熔敷金属中出现四瓣状Al Si Mn Fe相。若加入等量的Fe、Ni,熔敷金属中会形成间断的Al Si Fe Ni网状组织 ;若同时加入锰 ,除了生成网状结构外 ,还会同时存在四瓣状Al Si Mn Fe相和三瓣状的Al Si Mn Fe Ni相。在铝硅合金中 ,单独加镍、同时加稀土和镍、同时加稀土和锰、同时加锰和镍均可很好地抑制针状铁相。锰、镍抑制针状铁相的效果明显优于稀土。
基金Projects (CSTC2013jcyjC60001) supported by the Chongqing Science and Technology Commission of ChinaProject (KJ120834) supported by the Chongqing Education Commission of ChinaProject (CQUT1205) supported by the Open Funds from Key Laboratory of Manufacture and Test Techniques for Automobile Parts(Chongqing University of Technology),Ministry of Education,China
文摘The effects of the addition of 0.6%Ca（mass fraction） on the as-cast microstructure and mechanical properties of the Mg-3Ce-1.2Mn-0.9Sc and Mg-4Y-1.2Mn-0.9Sc magnesium alloys were investigated and compared by optical microscopy and scanning electron microscopy,differential scanning calorimetry analysis,and tensile and creep tests.The results indicate that the addition of 0.6%Ca to the Mg-3Ce-1.2Mn-0.9Sc and Mg-4Y-1.2Mn-0.9Sc alloys can refine the grains of the two alloys.At the same time,the addition of 0.6%Ca to the Mg-3Ce-1.2Mn-0.9Sc and Mg-4Y-1.2Mn-0.9Sc alloys can effectively improve the tensile properties of the two alloys.In addition,the addition of 0.6%Ca can also improve the creep properties of the Mg-3Ce-1.2Mn-0.9Sc alloy but is not beneficial to the creep properties of the Mg-4Y-1.2Mn-0.9Sc alloy.The different effects of minor Ca on the creep properties of the Mg-3Ce-1.2Mn-0.9Sc and Mg-4Y-1.2Mn-0.9Sc alloys are possibly related to the difference in the solid solubilities of Ce and Y in Mg.
