The hot deformation behavior of the premium GH4738 alloy was investigated in the temperature range of 1313 to 1353 K at strain rates of 0.01 to 1 s^(−1)using the hot compression test.To accurately predict flow stress,...The hot deformation behavior of the premium GH4738 alloy was investigated in the temperature range of 1313 to 1353 K at strain rates of 0.01 to 1 s^(−1)using the hot compression test.To accurately predict flow stress,three novel strain compensation constitutive equations were developed and rigorously assessed.The results indicate that the power function model(correlation coefficients r=0.98544)demonstrates greater prediction accuracy compared to other functions,with a calculated average activation energy of 507.968 kJ mol−1.Additionally,electron backscattered diffraction technology and transmission electron microscopy were used to analyze the evolution of the alloy microstructure during dynamic recrystallization under different deformation conditions.The results show that under high-temperature and large deformation conditions,the dislocation density and the degree of grain rotation increase,which promotes the formation and growth of new recrystallized grains,so that recrystallization is completed when the deformation amount reaches 30%.Besides,the increase in the temperature not only enhances the thermal activation mechanism,but also improves the grain size uniformity and texture consistency.Meanwhile,the carbide inhibits grain overgrowth by pinning grain boundaries,maintaining a fine and uniform grain structure of the alloy,and thereby improving the plasticity of the material.展开更多
The 2025(15th)China Daily Chemical Industry Forum(CDCIF 2025)and its concurrent event,the 2025 China International Premium Exhibition for Personal Care Ingredients,Packaging&Machinery(IPE 2025)concluded successful...The 2025(15th)China Daily Chemical Industry Forum(CDCIF 2025)and its concurrent event,the 2025 China International Premium Exhibition for Personal Care Ingredients,Packaging&Machinery(IPE 2025)concluded successfully in Guangzhou from September 22nd to 24th.Hosted by the China Research Institute of Daily Chemical(RIDCI),and organized by the China Information Center of Daily Chemical Industry and Productivity Promotion Center of Surfactant and Detergent,the event gathered nearly 600 representatives from government departments,industry associations,and leading enterprises.展开更多
One of Cambodia’s leading rice exporters,Apsara Rice,is known for its flagship product Apsara fragrant rice.Nurtured by the country’s fertile red soil and ample sunlight and rainfall thanks to its tropical monsoon c...One of Cambodia’s leading rice exporters,Apsara Rice,is known for its flagship product Apsara fragrant rice.Nurtured by the country’s fertile red soil and ample sunlight and rainfall thanks to its tropical monsoon climate,this rice features plump,translucent grains with a rich aroma and a soft,sticky,and elastic texture.展开更多
In petroleum extraction,the sealing surfaces of bolted joints are susceptible to damage due to the high-temperature and high-pressure conditions in wellbores.This damage adversely affects sealing performance,consequen...In petroleum extraction,the sealing surfaces of bolted joints are susceptible to damage due to the high-temperature and high-pressure conditions in wellbores.This damage adversely affects sealing performance,consequently leading to the failure and damage of threaded connections.In severe cases,it can result in considerable economic losses and trigger safety accidents.The sealing performance of special bolted joints holds crucial importance for production efficiency,output,equipment lifespan,and cost control.Enhancing the sealing perfor-mance of threaded connections can have a positive impact on industrial production and environmental protection.The existing research on American Petroleum Institute threaded joints has been thorough and has obtained a series of excellent results.However,the research on the sealing damage mechanism of threaded connections under complex well conditions lacks sufficient depth and that on new sealing technology is scarce.This study proposes a half-size evaluation test to address the abovementioned problem.Based on this test,an investigation into the sealing performance of threaded connections under high-temperature,cyclic loading,and high-temperature creep conditions is conducted.This study uses a combined approach of finite element methods and experiments to investigate the impact of different makeup torques on the sealing performance of premium threaded connections(PTCs).The results of the half-size evaluation test indicate that temperature notably influences the sealing performance of threaded connections.The continuous action of high temperatures causes contact pressure and sealing performance to decrease,and sealing contact pressure increases after cooling.Finite element and test results show that for a certain joint A,the greater the torque,the higher the critical sealing pressure of the thread,and the better the sealing performance.The research on the sealing damage mechanism of PTCs provides a scientific basis and theoretical guidance for the further optimization and development of PTCs.展开更多
The 51st China Beijing International Gifts,Premium and Houseware Exhibition(hereinafter referred to as the Gifts Exhibition) officially opened the kaleidoscope of creative gifts at China International Exhibition Cente...The 51st China Beijing International Gifts,Premium and Houseware Exhibition(hereinafter referred to as the Gifts Exhibition) officially opened the kaleidoscope of creative gifts at China International Exhibition Center (Chaoyang Pavilion) on March 20th.More than 900 exhibitors built an aesthetic corridor of quality life with 200,000 gifts.展开更多
加拿大Premium砂业公司发布太阳能玻璃制造计划进展通报。美国项目进展目前,Premium持续推进其位于美国南部的压花太阳能玻璃制造工厂(“美国项目”)开发工作,该工厂预计年产相当于4GW的压花太阳能玻璃。公司已选定Toledo Engineering和...加拿大Premium砂业公司发布太阳能玻璃制造计划进展通报。美国项目进展目前,Premium持续推进其位于美国南部的压花太阳能玻璃制造工厂(“美国项目”)开发工作,该工厂预计年产相当于4GW的压花太阳能玻璃。公司已选定Toledo Engineering和Bottero公司开展施工前工程设计,并由Green City Glass公司担任业主工程师。此项工程将细化项目资本成本与施工进度,为公司的建设融资提供支持。展开更多
Myanmar has a long teagrowing tradition,with 800,000 acres of plantations in both northern and southern Shan State.Its unspoiled environment offers a unique natural advantage,providing top-quality tea leaves for makin...Myanmar has a long teagrowing tradition,with 800,000 acres of plantations in both northern and southern Shan State.Its unspoiled environment offers a unique natural advantage,providing top-quality tea leaves for making premium milk tea.Yoke The’Myanmar Milk Tea,a signature product from Taw Win Kanbawza Mountain Company(Myanmar),is a flagship of the country’s tea culture and reflects its distinctive flavors and local charm.展开更多
基金supported by the National Key R&D Program of China(No.2021YFB3700403).
文摘The hot deformation behavior of the premium GH4738 alloy was investigated in the temperature range of 1313 to 1353 K at strain rates of 0.01 to 1 s^(−1)using the hot compression test.To accurately predict flow stress,three novel strain compensation constitutive equations were developed and rigorously assessed.The results indicate that the power function model(correlation coefficients r=0.98544)demonstrates greater prediction accuracy compared to other functions,with a calculated average activation energy of 507.968 kJ mol−1.Additionally,electron backscattered diffraction technology and transmission electron microscopy were used to analyze the evolution of the alloy microstructure during dynamic recrystallization under different deformation conditions.The results show that under high-temperature and large deformation conditions,the dislocation density and the degree of grain rotation increase,which promotes the formation and growth of new recrystallized grains,so that recrystallization is completed when the deformation amount reaches 30%.Besides,the increase in the temperature not only enhances the thermal activation mechanism,but also improves the grain size uniformity and texture consistency.Meanwhile,the carbide inhibits grain overgrowth by pinning grain boundaries,maintaining a fine and uniform grain structure of the alloy,and thereby improving the plasticity of the material.
文摘The 2025(15th)China Daily Chemical Industry Forum(CDCIF 2025)and its concurrent event,the 2025 China International Premium Exhibition for Personal Care Ingredients,Packaging&Machinery(IPE 2025)concluded successfully in Guangzhou from September 22nd to 24th.Hosted by the China Research Institute of Daily Chemical(RIDCI),and organized by the China Information Center of Daily Chemical Industry and Productivity Promotion Center of Surfactant and Detergent,the event gathered nearly 600 representatives from government departments,industry associations,and leading enterprises.
文摘One of Cambodia’s leading rice exporters,Apsara Rice,is known for its flagship product Apsara fragrant rice.Nurtured by the country’s fertile red soil and ample sunlight and rainfall thanks to its tropical monsoon climate,this rice features plump,translucent grains with a rich aroma and a soft,sticky,and elastic texture.
文摘In petroleum extraction,the sealing surfaces of bolted joints are susceptible to damage due to the high-temperature and high-pressure conditions in wellbores.This damage adversely affects sealing performance,consequently leading to the failure and damage of threaded connections.In severe cases,it can result in considerable economic losses and trigger safety accidents.The sealing performance of special bolted joints holds crucial importance for production efficiency,output,equipment lifespan,and cost control.Enhancing the sealing perfor-mance of threaded connections can have a positive impact on industrial production and environmental protection.The existing research on American Petroleum Institute threaded joints has been thorough and has obtained a series of excellent results.However,the research on the sealing damage mechanism of threaded connections under complex well conditions lacks sufficient depth and that on new sealing technology is scarce.This study proposes a half-size evaluation test to address the abovementioned problem.Based on this test,an investigation into the sealing performance of threaded connections under high-temperature,cyclic loading,and high-temperature creep conditions is conducted.This study uses a combined approach of finite element methods and experiments to investigate the impact of different makeup torques on the sealing performance of premium threaded connections(PTCs).The results of the half-size evaluation test indicate that temperature notably influences the sealing performance of threaded connections.The continuous action of high temperatures causes contact pressure and sealing performance to decrease,and sealing contact pressure increases after cooling.Finite element and test results show that for a certain joint A,the greater the torque,the higher the critical sealing pressure of the thread,and the better the sealing performance.The research on the sealing damage mechanism of PTCs provides a scientific basis and theoretical guidance for the further optimization and development of PTCs.
文摘The 51st China Beijing International Gifts,Premium and Houseware Exhibition(hereinafter referred to as the Gifts Exhibition) officially opened the kaleidoscope of creative gifts at China International Exhibition Center (Chaoyang Pavilion) on March 20th.More than 900 exhibitors built an aesthetic corridor of quality life with 200,000 gifts.
文摘加拿大Premium砂业公司发布太阳能玻璃制造计划进展通报。美国项目进展目前,Premium持续推进其位于美国南部的压花太阳能玻璃制造工厂(“美国项目”)开发工作,该工厂预计年产相当于4GW的压花太阳能玻璃。公司已选定Toledo Engineering和Bottero公司开展施工前工程设计,并由Green City Glass公司担任业主工程师。此项工程将细化项目资本成本与施工进度,为公司的建设融资提供支持。
文摘Myanmar has a long teagrowing tradition,with 800,000 acres of plantations in both northern and southern Shan State.Its unspoiled environment offers a unique natural advantage,providing top-quality tea leaves for making premium milk tea.Yoke The’Myanmar Milk Tea,a signature product from Taw Win Kanbawza Mountain Company(Myanmar),is a flagship of the country’s tea culture and reflects its distinctive flavors and local charm.
