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| 1 | Improvement of Toughness of Ultrahigh Strength Steel Aermet 100显示文摘The influence of double aging on the microstructure and mechanical properties of ultrahigh strength steel Aermet100 was analyzed. Under the double aging, there is no apparent decrease in the strength of steel. However, theimpact fatigue life can be prolonged by 35.5% and dynamic fracture toughness be raised by 22.6% respectively, ascompared with the normal aging. Based on the observation of microscopic structure, the physical mechanism ofthe prolongation of impact fatigue life and the enhancement of stability of the reverted austenite, AR, is analyzedfurther. The results show that this new technique is a breakthrough of combination optimization between strengthand toughness for Aermet 100 steel. In the light of the current understanding on this subject, the volume fractureof soften and tough AR formed in process of heat preservation at higher temperature of double aging increasesdrastically. Moreover, during the treatment of lower temperature of double aging, the carbon separating from themartensitic ferrite will diffuse into AR, resulting that the martensitic brittleness decreases and the stability of ARincreases. | Liuding WANG Laizhu JIANG Ming ZHU Xiao LIU Wangmin ZHOU | 2005 | Journal of Materials Science & Technology2005，21，5： | 15 |
| 2 | Study on the microstructure of 12%chromium low carbon stainless steel in a high temperature heat-affected zone显示文摘Coarsening,embrittlement and corrosion sensitization in a high temperature heat-affected zone(HTHAZ) are the major problems when 12%chromium low carbon stainless steel is being welded,which induce the deterioration of the impact toughness at a low temperature and intergranular corrosion resistance property.This study investigates the corresponding microstructures in HTHAZ with different chemical compositions and heat inputs through thermal simulation tests.The results show that the martensite content increases with the descending of ferrite factor(FF) when FF is below 9.0 and heat input influences the microstructure of high FF steel in HTHAZ.Martensite of 12%Cr stainless steel in HTHAZ with only Nb stabilization reticularly distributes at ferrite grain boundaries. | ZHENG Huaibei YE Xiaoning WANG Baosen JIANG Laizhu LIU Zhenyu WANG Guodong | 2010 | Baosteel Technical Research2010，4，1： | 4 |
| 3 | Effects of Nitrogen Concentration on Microstructure and Antibacterial Property of Copper-Bearing Austenite Stainless Steels显示文摘Austenite antibacterial stainless steels have been found to have wide applications in hospitals and food indus- tries.In recent years epsilon copper precipitation in antibacterial stainless steels has obtained much research interest due to its antibacterial action.The objective of this study was to determine the effects of nitro- gen concentration on the precipitation of epsilon copper and antibacterial property.Two kinds of austenite antibacterial stainless steels containing copper and different nitrogen concentration(0.02 and 0.08 wt pct,re- spectively)were prepared and the microstructures were characterized by a combination of electron microscopy and thermodynamic analysis.A mathematical expression was deduced to predict the effect of nitrogen con- centration on the activity coefficient of copper,In(f_(Cu)/f_(cu)~0=0.53524+4.11x_N-0.48x_N^2.Higher nitrogen was found to increase the free energy difference of copper concentration distribution between precipitation phase and austenite matrix,stimulate the aggregation of copper atoms from austenite,increase the precipitation amount and consequently enhance the antibacterial property of steel. | Zhixia ZHANG Laizhu JIANG Gang LIN Zhou XU | 2008 | Journal of Materials Science & Technology2008，24，5： | 4 |
| 4 | Effect of micro-alloying Nb and Ti on solidification structure in 430 ferritic stainless steel显示文摘With the increase in the content of carbon,nitrogen and titanium in 430 ferritic stainless steel,the refinement of the solidification structure is obvious and the proportion of equiaxed grain increases remarkably as well.This is attributed to the increasing role of the inhomogeneous nucleation by TiN particles during solidification.In addition, more fine precipitations of(Ti,Nb)N are found in steel with increased carbon and nitrogen content. | Du Wei Jiang Laizhu Sun Quanshe Liu Zhenyu | 2008 | Baosteel Technical Research2008，2，1： | 2 |
| 5 | Surface segregation of copper in antibacterial ferritic stainless steel显示文摘By using auger electron spectroscopy(AES)and diffusion theory to analyze the surface segregation of copper in antibacterial ferritic stainless steel,establishing a diffusion model,and calculating the activation energy of diffusion of the copper in ferrite,the affect of surface segregation on the antibacterial capabilities were researched.The results show that the concentration of the copper surface at 973 K and 1 073 K could be expressed asln (X_(Cu)~s)/(X_(Cu)~b)=k_0 ((Dt)^(1/2))/d((-ΔH_r^(Cu)+ΔH_r^(iron)+ΔH_s^(Cu))/(3RT)),with the parameters relating to the concentration of the diffusion layer,the coefficient of diffusion,the length of diffusion,the latent heat of evaporation and the latent heat of fusion.The activation energy of diffusion of copper in ferrite is approximately 221.688 kJ/mol.The antibacterial property of the steel is improved as the surface segregation of the copper is increased.At 1073 K for 60 min,the concentration of the surface copper is over three times higher than the basic concentration.The antibacterial property of the stainless steel can reach approximately 99.9%. | Zhang Zhixia Lin Gang Jiang Laizhu | 2008 | Baosteel Technical Research2008，2，2： | 2 |
| 6 | Comparative research on the mechanical property and precipitation of the 2101 and 2205 duplex stainless steels显示文摘The mechanical property and precipitation of the 2101 and 2205 duplex stainless steels were investigated.The results show that with nitrogen-content increasing from 0.12% to 0.26% to partly replace nickel,the yield strength of the 2101 steel gains an increase of 80 MPa whilst its elongation proportion keeps unchanged.The impact energy at a low temperature is obviously reduced.The temperature at which the impact energy starts decreasing is lower than 20℃,-20℃ and-40℃ for the 2101 steels containing 0.5%Ni,1.5%Ni and 2.5%Ni respectively,whereas it is-70℃ for the 5%Ni-containing 2205 steel.The nose temperature of precipitation is 700℃ for the 2101 steel and 850℃ for the 2205 steel.The scanning electronic microscope(SEM),the transmission electron microscope(TEM)and the X-ray diffraction(XRD)analyses show that the drop in the impact energy of the 2101 steel can be mainly attributed to the precipitation of Cr2N upon ageing while it is attributed to the sigma phase for the 2205 steel. | ZHANG Wei JIANG Laizhu SONG Hongmei HU Jincheng WANG Zhiyu | 2010 | Baosteel Technical Research2010，4，2： | 2 |
| 7 | Effects of the composition, shape factor and area fraction of sulfide inclusions on the machinability of re-sulfurized freemachining steel显示文摘 | Jiang Laizhu Cui Kun | 1996 | Materials Processing Technology1996，56，： | 1 |
| 8 | Study on microstructure of low carbon 12% chromium stainless steel in high temperature heat-affected zone 显示文摘 | Zheng Huaibei Ye Xiaoning Jiang Laizhu | 2010 | Materials and Design2010，31，10： | 1 |
| 9 | Study on microstructure of low carbon 12% chromium stainless steel in high temperature heat-affected zone显示文摘 | Zheng Huaibei Ye Xiaoning Jiang Laizhu | 2010 | Materials and Design2010，31，10： | 1 |
| 10 | Effect of ageing on precipitation amiimpact energy of 2101 economical duplex stainless steel 显示文摘 | Zhang Wei Jiang Laizhu | 2009 | Materials characterization2009，60，： | 1 |
| 11 | Research on the SUS304 hot-rolled austenitic stainless steel strip by TMCP显示文摘To avoid intergranular corrosion and obtain microstructural homogenization,the conventional SUS304 austenitic stainless steel needs to be solution annealed after hot rolling.This study investigates the thermal-mechanical controlled process (TMCP) of SUS304 steel,especially the controlled rolling and online accelerated cooling procedures.The objective of this research is to reduce or even prevent carbide precipitation based on the description of the time-temperature-precipitation (TTP) curve.The dynamic and post-dynamic recrystallization behaviors of this steel ensured the homogenization of grains in this process due to,which was studied by the hot compression tests.The microstructure and the properties of the TMCP-produced SUS304 steel strip were compared with the conventional method of solution annealing.Based on the above results,the newly developed TMCP-produced SUS304 hot-rolled austenitic stainless steel strip has been successfully produced and it can be directly utilized in the cold rolling process without solution annealing. | HAN Jian HE Shen WANG Zhiyu JIANG Laizhu | 2009 | Baosteel Technical Research2009，3，2： | 1 |
| 12 | Effect of ageing on precipitation and impact energy of 2101 economical duplex stainless steel显示文摘 | ZHANG Wei JIANG Laizhu | 2009 | Materials Characterization2009，60，1： | 1 |
| 13 | Effect of ageing on precipitation and impact energy of 2101 economical duplex stainless steel 显示文摘 | Zhang Wei Jiang Laizhu | 2009 | Materials Characterization2009，60，1： | 1 |
| 14 | Effect of ageing on the precipitation and impact energy of 2101 economical duplex stainless steel显示文摘 | Zhang Wei Jiang Laizhu and Hu Jincheng | 2009 | Mater Char2009，，： | 1 |
| 15 | Effect of ageing on precipitation and impact energy of 210l economical duaplex stainless steel显示文摘 | Zhang Wei Jiang Laizhu Hu Jinchenga Song Hongneia | 2009 | Materials Characterization2009，60，： | 1 |
| 16 | Effect of ageing on precipitation and impact energy of 2101 economical duplex stainless steel显示文摘 | Zhang Wei Jiang Laizhu Hu Jincheng Song Hongmei | 2008 | Materials Characterization2008，，1： | 1 |
| 17 | Annealing temperature effect on the pitting corrosion resistance of plasma arc welded joints of duplex stainless steel UNS S32304 in 1.0<ce:hsp sp='0.25'/>M NaCl显示文摘 | Hua Tan Zhiyu Wang Yiming Jiang Dong Han Jufeng Hong Lindou Chen Laizhu Jiang Jin Li | 2011 | Corrosion Science2011，，6： | 1 |
| 18 | Effects of the composition, shape factor and area fraction of sulfide inclusiona on the machinability of re - sttlfurized free - machining steel 显示文摘 | Jiang Laizhu Kun U Hannu F | 1996 | Materials Process Technology1996，58，： | 1 |
| 19 | Effect of ageing on precipitation and impact energy of 2101 economical duplex stainless steel显示文摘 | Zhang Wei Jiang Laizhu Hu Jincheng | 2009 | Mater Char2009，60，： | 1 |
| 20 | Effect of ageing on precipitation and impact energy of 2101 economical duplex stainless steel显示文摘 | Zhang Wei Jiang Laizhu Hu Jincheng | 2009 | Material Characterization2009，60，： | 1 |
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