材料期刊网

IMPROVEMENT OF DUCTILITY AND TOUGHNESS OF Ni-RICH NiAl AT ROOM TEMPERATURE

CHENG Tianyi Beijing Institute of Technology , Beijing , ChinaCANTORB University of Oxford , UKMcLEANM FLOWERHM Imperial College , UK CHENG Tianyi , associate professor , Faculty of Metallography , Beijing Institute of Technology , Beijing 100081 , China

金属学报(英文版)

In rapidly solidified Ni-34.6 at-% Al alloy,when the cooling the rate during solidification reached the order of 10~6 K/s,the size of the microstructures,such as the grains and substructure of the martensite,decreased dramatically.The various kinds of interfaces with high density and homogeneous distribution resisted effectively the propagation of the cracks and resulted in localized plastic deformation ahead of the tips of microcracks.The ductility and toughness at room temperature of the Ni-rich NiAl may be improved considerably.

关键词: NiAl , null , null , null

FLOW STRESS OF STEEL 55SiMnVB AT HIGH TEMPERATURES AND HIGH STRAIN RATES

ZHAO Jiarong YANG Jie Wuhan Iron and Steel University , Wuhan , China ZHAO Jiarong , associate professor , Faculty of Rolling , Wuhan Iron and Steel University , Wuhan 430081 , China

金属学报(英文版)

Based on the analyses of hot-deformation mechanism of the steel,a new constitutive equation describing the flow stress of steels was derived.The flow stress data of steel 55SiMnVB have been determined at 900—1200℃,strain rates of 1—100s~(-1)and true-strain of 0.08—0.8.An available evaluated formula on the flows tress has been obtained by means of non-linear regression.It can express clearly the physical process of hot-deformation.

关键词: flow stress , null , null

ATOMIC DIFFUSION CONTROL DURING TEMPERING OF STEEL 20Cr11MoVNbNB

FU Changpu HAN Yong Shaanxi Mechanical Engineering Institute , Xi'an , China FU Changpu , associate professor , Department of Materials Engineering , Shaanxi Mechanical Engineering Institute , Xi'an 710048 , China

金属学报(英文版)

Studies were made of the effect of tempering at temperatures from 25 to 750℃ for 0.5 to 100 h on changes of hardness,precipitated phase and its alloying element content as well as activation energy of tempering for quenched steel 20Cr11MoVNbNB.Tempering of the steel at temperatures below 400℃ may be controlled by the diffusion of C atoms in α-Fe,and above 400℃,by diffusion of Cr,also Mo or V,in α-Fe.

关键词: steel 20Cr11MoVNbNB , null , null , null

EFFECTS OF SLIP MODE ON CYCLIC BEHAVIOR OF PRESTRAINED MATERIALS

CHAI Huifen RUAN Zheng FAN Quncheng (Xi'an Jiaotong University , Xi'an , China CHAI Huifen , associate professor , Department of Materials , Xi'an Jiaotong University , Xi'an 710049 , China

金属学报(英文版)

The cyclic behaviours of two prestrained materials with different slip modes have been com- pared.From the analysis of hysterisis loops,it is suggested that the decrease in back stress dominates the cyclic process of Cu-Zn alloy with planar slip mode,while the decrease in frictional stress is the main factor affecting the behaviour of Cu with wavy slip mode.The re- lation between the dislocation configuration and internal stress has been also discussed.By means of the relation just mentioned,the variations of dislocation configuration before and after fatigue of the two materials,the differences in their softening mechanism and mechani- cal behaviour could be interpreted.

关键词: slip mode , null , null , null

FATIGUE BEHAVIOUR OF M/B DUPLEX STRUCTURE IN A HIGH CARBON Cr-Mo-W STEEL

TIAN Baohong ZHENG Shi'an WU Lei Luoyang Institute of Technology , Luoyang , China ZHENG Shi'an , associate professor , Department of Materials Engineering , Luoyang Institute of Technology , Luoyang 471039 , China

金属学报(英文版)

Determination was carried out of fatigue crack propagation rate of steel 65Cr5Mo3W2VSiTi (LM2)with various bainite contents and M/B duplex structure tempered at various tempera- tures.The threshold value of fatigue for each processing was estimated by experimental data. The mechanism for fatigue crack propagation of M/B duplex structure in steel LM2 seems to be non-continuous.The calculated fatigue crack micro-propagation rates are found to agree with the experimental data.

关键词: duplex structure , null , null , null

稀土对工业纯铁中温内耗的影响

戢景文 , 赖祖涵 , 吴玉琴 , 张国福 , 李广义

金属学报

研究了稀土对工业纯铁中温内耗的影响.结果表明:其影响程度和热处理过程密切相关,铁中稀土有合金化作用.炉冷后变形铁在600℃时效,仍存在Snoek Ke-Koster(以下简称SKK)峰;随时效温度升高,SKK峰温度T_p不是单一下降,在600℃时效出现明显回升。

关键词: 内耗 , associate professor , Department of Physics

An Example of the Scientists—Congratulate Professor SHI Changxu on His Seventyth Birthday

DirectorsBoardofInstituteofMetalResearch , AcademiaSinica

金属学报(英文版)

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Professor XU Zhong-yu and his research activities

新型炭材料

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Preface to Special Issue on Photocatalysis for celebrating the 20th anniversary of Professor Jimmy C. Yu’s return to Hong Kong and leading photocatalytic research there

催化学报 doi:10.1016/S1872-2067(15)61006-3

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SUBSTRUCTURE ALTERATION OF STAINLESS STEEL DURING CONSTANT STRAIN FATIGUE

WANG Jingyi Xi'an Institute of Technology , Xi'an , ChinaTAN Yuxu MA Zenghai Xi'an Jiaotong University , Xi'an , China Institute of Mealic Materials and Strength , Xi'an Jiaotong University , Xi'an 710049 , China

金属学报(英文版)

The alteration of substructure of an austenitic stainless steel has been investigated during con- stant strain fatigue.No plateau stage on the cyclic stress-strain curve was observed for the stainless steel in contrast with a monocrystalline pure copper specimen.This may relate to its low stacking fault energy.During strain fatigue under various amplitudes the substructure of dislocation in austenite alterates correspondingly.It revealed to associate with the appearance change of the cyclic stress-strain curve.

关键词: austenitic strainless steel , null , null