Along with strict environmental regulation, new-energy vehicles are becoming increasingly popular due to their low emissions, and they will inevitably replace existing fossil-fuel-based buses in China. To achieve a li...Along with strict environmental regulation, new-energy vehicles are becoming increasingly popular due to their low emissions, and they will inevitably replace existing fossil-fuel-based buses in China. To achieve a lightweight bus body ,high-strength steels are commonly used for the bus frame,but these grades are susceptible to corrosion. From the perspective of ＂lower life-cycle cost＂, high-strength stainless steel is a better bus structure choice than high-strength carbon steels, since stainless steel bus frames last 10-15 years without requiring any maintenance. The low-cost high-strength stainless steels developed by Baosteel are introduced,the yield and tensile strengths of which can be controlled to within the range of 350-700 MPa and 900-1 200 MPa,respectively, and the elongation values are above 30%. Measurements of the toughness and fatigue resistance of these high-strength stainless steels and their joints indicate that the structural integrity requirements for bus frames can be met. The results of salt spray corrosion studies indicate that stainless steels will substantially increase the service life of bus frames in wet and icy winter conditions where deicing with CaC12 is necessary for road safety. The results of our investigation clearly indicate that high-strength stainless steel is a potential bus-frame material that makes it possible to achieve substantial weight savings, excellent corrosion resistance, and prolonged operational life.展开更多
Mn is a weak element for austenite formation and its effect on martensitic stainless steel is seldom researched. The microstructure and property of 13Cr martensitic stainless steel with varied Mn content and low carbo...Mn is a weak element for austenite formation and its effect on martensitic stainless steel is seldom researched. The microstructure and property of 13Cr martensitic stainless steel with varied Mn content and low carbon content were studied. The research demonstrates that Mn enlarges the austenitic zone at a high temperature and increases the strength and hardness of martensitic stainless steel. Following the addition of Mn,the corrosion resistance property of low carbon 13Cr stainless steel only decreases slightly. The strength and hardness of low carbon 13Cr stainless steel containing Mn is similar to that of high carbon 13Cr stainless steel.展开更多
In this work,the effects of temperature and cooling rate on the precipitation of carbides in nickel-saving metastable austenitic stainless steel were studied.The test results show that the temperature range of carbide...In this work,the effects of temperature and cooling rate on the precipitation of carbides in nickel-saving metastable austenitic stainless steel were studied.The test results show that the temperature range of carbide precipitation in the test steel was 500-950℃,and 750℃was the most sensitive temperature.However,when completely solution treated samples were cooled from high to room temperature at a cooling rate of more than 50 K/s,no carbides precipitated.The carbide precipitates increased the yield strength but decreased the corrosion resistance of the steel,with little impact on toughness.展开更多
智能制造的蓬勃发展奠定了新一代工业革命的基石,而智能化生产需要实时采集现场工业数据,并通过大数据分析和计算,实现智能决策与控制。特别是随着视觉技术的迅猛发展,大量的视觉数据回传,对工业网络提出巨大的挑战。从工业场景入手,分...智能制造的蓬勃发展奠定了新一代工业革命的基石,而智能化生产需要实时采集现场工业数据,并通过大数据分析和计算,实现智能决策与控制。特别是随着视觉技术的迅猛发展,大量的视觉数据回传,对工业网络提出巨大的挑战。从工业场景入手,分析智能制造对工业网络,特别是吞吐量方面的性能需求,进而提出基于第五代移动通信技术(5th generation mobile communication technology,5G)高频系统的无线解决方案,并完成5G高频网络的性能测试。测试结果表明,5G高频解决方案满足智能制造上行高吞吐量的需求。展开更多
基金sponsored by Shanghai Committee of Science and Technology with the project No.15XD1520100
文摘Along with strict environmental regulation, new-energy vehicles are becoming increasingly popular due to their low emissions, and they will inevitably replace existing fossil-fuel-based buses in China. To achieve a lightweight bus body ,high-strength steels are commonly used for the bus frame,but these grades are susceptible to corrosion. From the perspective of ＂lower life-cycle cost＂, high-strength stainless steel is a better bus structure choice than high-strength carbon steels, since stainless steel bus frames last 10-15 years without requiring any maintenance. The low-cost high-strength stainless steels developed by Baosteel are introduced,the yield and tensile strengths of which can be controlled to within the range of 350-700 MPa and 900-1 200 MPa,respectively, and the elongation values are above 30%. Measurements of the toughness and fatigue resistance of these high-strength stainless steels and their joints indicate that the structural integrity requirements for bus frames can be met. The results of salt spray corrosion studies indicate that stainless steels will substantially increase the service life of bus frames in wet and icy winter conditions where deicing with CaC12 is necessary for road safety. The results of our investigation clearly indicate that high-strength stainless steel is a potential bus-frame material that makes it possible to achieve substantial weight savings, excellent corrosion resistance, and prolonged operational life.
文摘Mn is a weak element for austenite formation and its effect on martensitic stainless steel is seldom researched. The microstructure and property of 13Cr martensitic stainless steel with varied Mn content and low carbon content were studied. The research demonstrates that Mn enlarges the austenitic zone at a high temperature and increases the strength and hardness of martensitic stainless steel. Following the addition of Mn,the corrosion resistance property of low carbon 13Cr stainless steel only decreases slightly. The strength and hardness of low carbon 13Cr stainless steel containing Mn is similar to that of high carbon 13Cr stainless steel.
文摘In this work,the effects of temperature and cooling rate on the precipitation of carbides in nickel-saving metastable austenitic stainless steel were studied.The test results show that the temperature range of carbide precipitation in the test steel was 500-950℃,and 750℃was the most sensitive temperature.However,when completely solution treated samples were cooled from high to room temperature at a cooling rate of more than 50 K/s,no carbides precipitated.The carbide precipitates increased the yield strength but decreased the corrosion resistance of the steel,with little impact on toughness.
文摘智能制造的蓬勃发展奠定了新一代工业革命的基石,而智能化生产需要实时采集现场工业数据,并通过大数据分析和计算,实现智能决策与控制。特别是随着视觉技术的迅猛发展,大量的视觉数据回传,对工业网络提出巨大的挑战。从工业场景入手,分析智能制造对工业网络,特别是吞吐量方面的性能需求,进而提出基于第五代移动通信技术(5th generation mobile communication technology,5G)高频系统的无线解决方案,并完成5G高频网络的性能测试。测试结果表明,5G高频解决方案满足智能制造上行高吞吐量的需求。
