|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Oxidation,Mechanical and Tribological Behaviors of the Ni/cBN Abrasive Coating-Coated Titanium Alloys显示文摘In order to improve the oxidation and wear resistance of blades tip of titanium alloys as well as the sealing performance of the gas turbine engine,a Ni/cBN abrasive coating was prepared on titanium alloys through composite electroplating.Oxidation,mechanical and tribological properties of the abrasive coating were investigated.Furthermore,the effect of the oxidation on the mechanical and tribological properties was also evaluated.Oxidation results revealed that the abrasive coating underwent slight oxidation within 700℃.Meanwhile,some intermetallic compounds,Ni3Ti,NiTi and NiTi2,were formed at the coating/substrate interface during oxidation.Due to the pinning effect of cBN particles and the different thermal expansion coefficients of the coating and substrate,the coating/substrate interface was cracked after oxidation at 700℃.Tensile results showed that the presence of coating reduced the strength of the alloy significantly at room temperature,while only marginal variations of the strength of the coated and uncoated specimens at elevated temperatures.Besides,the wear tests indicated that the coating had the excellent cutting ability and wear resistance,which can effectively protect the blades tip of titanium alloys.As the temperature increased,the wear resistance decreased due to the decrease in the mechanical properties of the Ni/cBN coating. | Y.D.Liu J.H.Liu W.S.Gu H.L.Li W.H.Li Z.L.Pei J.Gong C.Sun | 2021 | Acta Metallurgica Sinica(English Letters)2021，34，7： | 4 |
| 2 | Study on the fatigue and wear characteristics of four wheel materials显示文摘The fatigue and wear characteristics of four different steel wheel materials are investigated in detail by using rolling contact fatigue and wear bench tests on a JD-1 apparatus,analyzing chemical composition and hardness,and performing profile analysis and micro-morphology analysis.The wear and fatigue behavior of one of the materials under different operation speeds is also investigated.The results show that the wear resistance of the materials has a positive correlation with their carbon content,while fatigue resistance has a negative correlation.Based on hardness analysis as a function of depth into the specimen,the thickness of layers with a steep hardness gradient has a negative correlation with the initial surface hardness in the tests using different materials.The hardness increments,however,have a positive correlation with initial surface hardness.The rolling tests on one material using different rotation speeds show that the hardness increments and the thickness of layers with a steep hardness gradient increase with the rotation speed.The analyses and experimental results demonstrate that two of the four materials exhibit good wear resistance and rolling contact fatigue resistance,making them suitable for either highspeed or heavy axle railroad operations. | G.Y.Zhou J.H.Liu W.J.Wang G.Wen Q.Y.Liu | 2013 | Journal of Modern Transportation2013，21，3： | 3 |
| 3 | 查看详情显示文摘 | Chen J Song J. L Sun X. W Deng W.Q.Jiang C.Y.Lei W.Huang J.H.Liu R.S | | 0，，15： | 1 |
| 4 | A new model and analytical solutions for borehole and pile ground heat exchangers显示文摘 | Y.Man H.X.Yang N.R.Diao J.H.Liu Z.H.Fang | | 0，，53： | 1 |
| 5 | 黄河上游盆地重组所导致的快速侵蚀下切显示文摘高起伏的造山高原边缘的快速剥蚀常被用来指代区域地表隆升^(1~3)。然而,诸如岩体隆升的空间差异~4,降雨的地形效应以及冰川~5、滑坡导致的河道堵塞^(6,7)等阻碍河流下切的因素,可能会使剥蚀作用严重滞后于地表抬升~8。本文中,我们通过研究青藏高原东北缘黄河沿岸沉积盆地的地层学、年代学和地貌学特征,重建黄河上游侵蚀下切的时间、速率以及模式。我们发现河流下切的起始时间明显晚于山体开始隆升的时间(14~8Ma)~9。高原边缘的河流下切始于1.8Ma^(10),然后以大约350km/Ma的速度向上游传递^(11)。我们认为该地区在气候驱动下的湖泊扩张并溢出作用是黄河上游快速下切的主要原因,并最终导致了现代黄河地貌的形成。 | W.H.Craddock E.Kirby N.W.Harkins H.P.Zhang X.H.Shi J.H.Liu 贾伟(译) 张波(译) 苏琦(校) | 2019 | 世界地震译丛2019，50，4： | 0 |
| 6 | Design and optimization of the composition and mechanical properties for non-equiatomic CoCrNi medium-entropy alloys显示文摘The development of multi-principal element alloys(MPEAs,also called as high-or medium-entropy al-loys,HEAs/MEAs)provides tremendous possibilities for materials innovation.However,designing MPEAs with desirable mechanical properties confronts great challenges due to their vast composition space.In this work,we provide an essential criterion to efficiently screen the CoCrNi MEAs with outstanding strength-ductility combinations.The negative Gibbs free energy difference△E_(FCC-BCC)between the face-centered cubic(FCC)and body-centered cubic(BCC)phases,the enhancement of shear modulus G and the decline of stacking fault energy(SFE)γ_(isf)are combined as three requisites to improve the FCC phase stability,yield strength,deformation mechanisms,work-hardening ability and ductility in the criterion.The effects of chemical composition on△E_(FCC-BCC),G andγisf were investigated with the first principles calculations for Co_(x)Cr_(33)Ni_(67-x),Co_(33)Cr_(y)Ni_(67-y)and Co_(z)Cr_(66-z)Ni_(34)(0≤x,y≤67 and 0≤z≤66)alloys.Based on the essential criterion and the calculation results,the composition space that displays the neg-ative Gibbs free energy difference△E_(FCC-BCC),highest shear modulus G and lowest SFEγ_(isf)was screened with the target on the combination of high strength and excellent ductility.In this context,the optimal composition space of Co-Cr-Ni alloys was predicted as 60 at.%-67 at.%Co,30 at.%-35 at.%Cr and 0 at.%-6 at.%Ni,which coincides well with the previous experimental evidence for Co_(55)Cr_(40)Ni_(5)alloys.The valid-ity of essential criterion is further proved after systematic comparison with numerous experimental data,which demonstrates that the essential criterion can provide significant guidance for the quick exploitation of strong and ductile MEAs and promote the development and application of MPEAs. | J.X.Yan Z.J.Zhang P.Zhang J.H.Liu H.Yu Q.M.Hu J.B.Yang Z.F.Zhang | 2023 | Journal of Materials Science & Technology2023，，8： | 0 |
| 7 | INFLUENCE OF TOP- TEMPERATURE OF THERMAL CYCLE ON THERMAL STRESS/STRAIN AND THERMAL FATIGUE BEHAVIOR OF PURE IRON显示文摘By using a self-made thermal fatigue test machine of outer-constraint mode, the influence of top-temperature of thermal cycle T t on thermal stress-strain and thermal fatigue behavior of an industrial pure iron was investigated. The T t was varied from stress/strain 773K to 1073K. The results show that, increasing of T t , the thermal stress-strain cycles can be classified into four types, they are: compressive stress cycle; compressive strain-tensile stress cycle; compressive strain-tensile stress cycle than changing to compressive tensile plastic strain cycle; and finally, compressive tensile plastic strain cycle. It is also revealed that certain relationship does exist between thermal fatigue life and characteristics of thermal stress/strain cycle. When compressive tensile plastic strain cycle were appear by increasing of T t , thermal fatigue life decreasing rapidly. The concept of thermal fatigue transition temperature, and determining method were put up in this thesis. | J.H.Liu 1) and S.H.Jiang 1) and M.Yao 2) 1) Department of mechanical Engineering, Engineering college, Yangzhou University, Yangzhou 225009, China 2) Department of Material Science, Yanshan University, Qinhuangdao 066000, China | 1999 | Acta Metallurgica Sinica(English Letters)1999，12，5： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员