The pseudo-equilibrium phase diagram and continuous cooling transformation diagram of an N-containing 8％ Cr roller steel were investigated by using thermodynamic calculation,differential scanning calorimetry,Ⅹ-ray d...The pseudo-equilibrium phase diagram and continuous cooling transformation diagram of an N-containing 8％ Cr roller steel were investigated by using thermodynamic calculation,differential scanning calorimetry,Ⅹ-ray diffraction,expansion method,and so on.Under equilibrium conditions,the main carbonitrides are MX,M7C3,and M23C6 types.The measured Ac1,Ac3,start temperature of martensitic transformation,and M7C3 transformation temperatures are 811,855,324,and 1100 ℃,respectively.Bainite appears at cooling rates ranging from 0.5 to 5 ℃/s and ferrite forms at grain boundaries at a cooling rate lower than 0.5 ℃/s.Finally,the effects of adding N and lowering the C content on workability and mechanical properties of common 8％Cr steel were discussed.展开更多
A 2D plane coordination compound [Ag_2（Dpya）_2.（NO_3）_2]n was synthesized and characterized by FT-IR,elemental analysis and TG analysis.The red crystal was obtained via solvent diffusion method at room temperature...A 2D plane coordination compound [Ag_2（Dpya）_2.（NO_3）_2]n was synthesized and characterized by FT-IR,elemental analysis and TG analysis.The red crystal was obtained via solvent diffusion method at room temperature and is slightly soluble in organic solvents.Its structure was determined by single-crystal X-ray diffraction analysis.It crystallizes in monoclinic,space group P1 with a = 10.7995（13）,b = 7.4748（8）,c = 18.364（2） A,β = 98.916（4）o,V = 1464.5（3） A^3,Z = 2,C_（26）H_（28）Ag_2N_（10）O_6,M_r = 792.32,Dc = 1.302 Mg/m^3,F（000） = 792,μ（Mo Ka） = 1.356 mm^-1,R = 0.0575 and w R = 0.0826.The compound [Ag_2（Dpya）_2.（NO_3）_2]_n is a two-dimensional structure and there are two kinds of coordination configurations about the Ag atoms in the compound.The Ag（1） center is tetrahedrally coordinated with two O atoms of NO_3^-and two N atoms from the ligand Dpya.Meanwhile,the Ag（2） is five-coordinated by five O atoms from three NO_3^-anions.The Ag centers（Ag（1） and Ag（2）） connect to themselves as well as with each other by the bridging NO_3^-anions.And the coordination compound shows photoluminescence with an emission peak at 530 nm（λex = 450 nm） as the ligand Dpya.展开更多
基金Sponsored by the Natural Science Foundation of Hebei Province for Distinguished Young Scholars(Grant No.E2011203131)the Natural Science Foundation-Steel and Iron Foundation of Hebei Province(Grant No.E2013203110)
文摘The pseudo-equilibrium phase diagram and continuous cooling transformation diagram of an N-containing 8％ Cr roller steel were investigated by using thermodynamic calculation,differential scanning calorimetry,Ⅹ-ray diffraction,expansion method,and so on.Under equilibrium conditions,the main carbonitrides are MX,M7C3,and M23C6 types.The measured Ac1,Ac3,start temperature of martensitic transformation,and M7C3 transformation temperatures are 811,855,324,and 1100 ℃,respectively.Bainite appears at cooling rates ranging from 0.5 to 5 ℃/s and ferrite forms at grain boundaries at a cooling rate lower than 0.5 ℃/s.Finally,the effects of adding N and lowering the C content on workability and mechanical properties of common 8％Cr steel were discussed.
基金the sponsorship and financial support from the Key Laboratory of Organic Synthesis of Jiangsu Province
文摘A 2D plane coordination compound [Ag_2（Dpya）_2.（NO_3）_2]n was synthesized and characterized by FT-IR,elemental analysis and TG analysis.The red crystal was obtained via solvent diffusion method at room temperature and is slightly soluble in organic solvents.Its structure was determined by single-crystal X-ray diffraction analysis.It crystallizes in monoclinic,space group P1 with a = 10.7995（13）,b = 7.4748（8）,c = 18.364（2） A,β = 98.916（4）o,V = 1464.5（3） A^3,Z = 2,C_（26）H_（28）Ag_2N_（10）O_6,M_r = 792.32,Dc = 1.302 Mg/m^3,F（000） = 792,μ（Mo Ka） = 1.356 mm^-1,R = 0.0575 and w R = 0.0826.The compound [Ag_2（Dpya）_2.（NO_3）_2]_n is a two-dimensional structure and there are two kinds of coordination configurations about the Ag atoms in the compound.The Ag（1） center is tetrahedrally coordinated with two O atoms of NO_3^-and two N atoms from the ligand Dpya.Meanwhile,the Ag（2） is five-coordinated by five O atoms from three NO_3^-anions.The Ag centers（Ag（1） and Ag（2）） connect to themselves as well as with each other by the bridging NO_3^-anions.And the coordination compound shows photoluminescence with an emission peak at 530 nm（λex = 450 nm） as the ligand Dpya.
