The ductility map of 304HC stainless was determined by using the Gleeble-1500 dynamic thermal-mechanical simulator. The effect of Cu on the hot ductility of 304HC stainless steel was analyzed and the mathematical mode...The ductility map of 304HC stainless was determined by using the Gleeble-1500 dynamic thermal-mechanical simulator. The effect of Cu on the hot ductility of 304HC stainless steel was analyzed and the mathematical model of resistance to deformation was established. The microstructure, inclusion and fracture surface were studied by using the method of micro structure analysis, scanning, energy spectrum and electron microscope. The results show that Cu has effect on the hot ductility, and the hot ductility of 304HC stainless steel decrease with the increase of content of Cu. The deformation temperature also has much effect on the hot ductility, the suitable deformation temperature are 1100-1200℃. The reason of it is that the Cu rich chemical compounds were precipitated from austenite phase during cooling. The Cu rich chemical compounds are brittle substance such as Cu2S, Cu2O and ε-Cu etc.展开更多
The plasticity map of 304HC stainless steel was determined by using tensile and compressive test. The effect of Cu on the hot plasticity of 304HC stainless steel was analyzed. The microstructure, inclusion and fractur...The plasticity map of 304HC stainless steel was determined by using tensile and compressive test. The effect of Cu on the hot plasticity of 304HC stainless steel was analyzed. The microstructure, inclusion and fracture surface were studied by using the method of optical microscopy, SEM, EDS and EPMA. The results showed that Cu has effect on the hot plasticity and the hot plasticity of 304HC stainless steel decrease with the increase of Cu content. The deformation temperature also has much effect on the hot plasticity, the suitable deformation temperature are 1100-1200℃. The reason is that the brittle compounds were precipitated from austenite during cooling. These brittle compounds are Cu2S, Cu2O and PbCI etc.展开更多
Stainless steel is so different from aluminum alloys in physical and chemicalcharacters. When they are welded directly, there tend to be Al-Fe brittle compounds on the joint.This paper investigates the processing perf...Stainless steel is so different from aluminum alloys in physical and chemicalcharacters. When they are welded directly, there tend to be Al-Fe brittle compounds on the joint.This paper investigates the processing performance, interface microstructures and mechanicalproperties of aluminum alloys/stainless steel by way of brazing after brush plating a Ni/Cutransitional layer on stainless steel. After the joints are brazed with Al-Si-Cu-Mg-Zn foil brazingfiller metal on different brazing parameters, both the mechanical properties and the microstructuresare satisfactory for application. And the influence of the brazing parameters on bonding quality ofthe brazed joints is discussed in detail. The results reveal that no brittle Al-Fe intermetallicCompound is found in the interfaces. The Ni/Cu electroplating layer effectively hinders thediffusion of Fe atoms from SUS304 to 5A03. Though a little AlCu_3 brittle compound is produced, itsquantity is too small to affect the strength of the joint.展开更多
基金This study was financially supported by both the National Natural Science Founda- tion of China (Grant No.59995440)the Natural Science Foundation of Liaoning Province (Grant No.2001101021).
文摘The ductility map of 304HC stainless was determined by using the Gleeble-1500 dynamic thermal-mechanical simulator. The effect of Cu on the hot ductility of 304HC stainless steel was analyzed and the mathematical model of resistance to deformation was established. The microstructure, inclusion and fracture surface were studied by using the method of micro structure analysis, scanning, energy spectrum and electron microscope. The results show that Cu has effect on the hot ductility, and the hot ductility of 304HC stainless steel decrease with the increase of content of Cu. The deformation temperature also has much effect on the hot ductility, the suitable deformation temperature are 1100-1200℃. The reason of it is that the Cu rich chemical compounds were precipitated from austenite phase during cooling. The Cu rich chemical compounds are brittle substance such as Cu2S, Cu2O and ε-Cu etc.
基金This work was supported by the National Natural Science Foundation of China(No.59995440)Liaoning Provincial Natural Science Foundation of China(No.2001101021).
文摘The plasticity map of 304HC stainless steel was determined by using tensile and compressive test. The effect of Cu on the hot plasticity of 304HC stainless steel was analyzed. The microstructure, inclusion and fracture surface were studied by using the method of optical microscopy, SEM, EDS and EPMA. The results showed that Cu has effect on the hot plasticity and the hot plasticity of 304HC stainless steel decrease with the increase of Cu content. The deformation temperature also has much effect on the hot plasticity, the suitable deformation temperature are 1100-1200℃. The reason is that the brittle compounds were precipitated from austenite during cooling. These brittle compounds are Cu2S, Cu2O and PbCI etc.
文摘Stainless steel is so different from aluminum alloys in physical and chemicalcharacters. When they are welded directly, there tend to be Al-Fe brittle compounds on the joint.This paper investigates the processing performance, interface microstructures and mechanicalproperties of aluminum alloys/stainless steel by way of brazing after brush plating a Ni/Cutransitional layer on stainless steel. After the joints are brazed with Al-Si-Cu-Mg-Zn foil brazingfiller metal on different brazing parameters, both the mechanical properties and the microstructuresare satisfactory for application. And the influence of the brazing parameters on bonding quality ofthe brazed joints is discussed in detail. The results reveal that no brittle Al-Fe intermetallicCompound is found in the interfaces. The Ni/Cu electroplating layer effectively hinders thediffusion of Fe atoms from SUS304 to 5A03. Though a little AlCu_3 brittle compound is produced, itsquantity is too small to affect the strength of the joint.
