In the ironmaking process,the addition of an organic binder to replace a portion of bentonite has the potential to improve the per-formance of pellets.The interaction between original bentonite(OB)and organic binder w...In the ironmaking process,the addition of an organic binder to replace a portion of bentonite has the potential to improve the per-formance of pellets.The interaction between original bentonite(OB)and organic binder was investigated.Results indicated that the micromor-phology of organic composite bentonite(OCB)became porous and the infrared difference spectrum exhibited a curved shape.In addition,the residual burning rates of OB and organic binder were determined to be 82.72%and 2.30%,respectively.Finally,the influence of OCB on the properties of pellets was investigated.The compressive strength of OCB-added green pellets(14.7 N per pellet)was better than that of OB-ad-ded pellets(10.3 N per pellet).Moreover,the range of melting temperature of OCB-added green pellets(173℃)was narrower than that of OB-added pellets(198℃).The compressive strength of OCB-added green pellets increased from 2156 to 3156 N per pellet with the increase in roasting temperature from 1200 to 1250℃.展开更多
With the extensively wide application of advanced high strength steels(AHSS) in various fields for the excellent mechanical properties,the industrial interest on the damage of AHSS is increasing in the recent years.Fo...With the extensively wide application of advanced high strength steels(AHSS) in various fields for the excellent mechanical properties,the industrial interest on the damage of AHSS is increasing in the recent years.For these modern steels,due to the complex microstructure and the relevant deformation mechanisms,the damage concept needs to be reexamined.In this paper,the definition,length scale and different mechanisms of damage are introduced.Both experimental evaluation of damage and the numerical damage models are briefly viewed and compared.The approaches to improve the damage tolerance are given in the framework of damage tolerance design principle.展开更多
Microalloyed steels for forging applications have been newly developed in order to increase strength and toughness properties which thereby give the possibility for light weight constructions.The properties of these s...Microalloyed steels for forging applications have been newly developed in order to increase strength and toughness properties which thereby give the possibility for light weight constructions.The properties of these steels are set up by a controlled cooling directly from the forging heat without an additional heat treatment.This aim can be achieved on the one hand by a further development of precipitation hardening ferritic pearlitic steels (AFP-steel) due to an extended use of microalloying elements (AFP-M steel) and on the other hand by microalloyed steels which employ a bainitic microstructure (HDB steel).To adjust the targeted microstructure the temperature control has to be assured down to approx.500℃ for the AFP-M steels and down to approx.300℃ for the HDB steels.展开更多
基金This work was financially supported by the National Nat-ural Science Foundation of China(No.51874025)the Na-tional Key R&D Program of China(No.2017YFB0304302-01)the Fundamental Research Funds for the Central Universities,China(No.FRF-NP-19-004).
文摘In the ironmaking process,the addition of an organic binder to replace a portion of bentonite has the potential to improve the per-formance of pellets.The interaction between original bentonite(OB)and organic binder was investigated.Results indicated that the micromor-phology of organic composite bentonite(OCB)became porous and the infrared difference spectrum exhibited a curved shape.In addition,the residual burning rates of OB and organic binder were determined to be 82.72%and 2.30%,respectively.Finally,the influence of OCB on the properties of pellets was investigated.The compressive strength of OCB-added green pellets(14.7 N per pellet)was better than that of OB-ad-ded pellets(10.3 N per pellet).Moreover,the range of melting temperature of OCB-added green pellets(173℃)was narrower than that of OB-added pellets(198℃).The compressive strength of OCB-added green pellets increased from 2156 to 3156 N per pellet with the increase in roasting temperature from 1200 to 1250℃.
文摘With the extensively wide application of advanced high strength steels(AHSS) in various fields for the excellent mechanical properties,the industrial interest on the damage of AHSS is increasing in the recent years.For these modern steels,due to the complex microstructure and the relevant deformation mechanisms,the damage concept needs to be reexamined.In this paper,the definition,length scale and different mechanisms of damage are introduced.Both experimental evaluation of damage and the numerical damage models are briefly viewed and compared.The approaches to improve the damage tolerance are given in the framework of damage tolerance design principle.
基金supported by the "Stiftung Stahlanwendungsforschung im Stifterverband für die Deutsche Wissenschaft e.V." (project no. AVIF A 228)the "Industrielle Gemeinschafts for schung (IGF)" (project no. IGF 260 ZN) upon the "Wirtschaftsverband Stahlund Metallverarbeitung e.V. (WSM)" for the "Industrieverband Massivumformung e. V (IMU)"
文摘Microalloyed steels for forging applications have been newly developed in order to increase strength and toughness properties which thereby give the possibility for light weight constructions.The properties of these steels are set up by a controlled cooling directly from the forging heat without an additional heat treatment.This aim can be achieved on the one hand by a further development of precipitation hardening ferritic pearlitic steels (AFP-steel) due to an extended use of microalloying elements (AFP-M steel) and on the other hand by microalloyed steels which employ a bainitic microstructure (HDB steel).To adjust the targeted microstructure the temperature control has to be assured down to approx.500℃ for the AFP-M steels and down to approx.300℃ for the HDB steels.
