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THEORETICAL CALCULATION OF SPECIFIC INTERFACIALENERGY OF SEMICOHERENT INTERFACE BETWEEN MICROALLOY CARBONITRIDES AND AUSTENITE

YONG Qilong LI Yongfu Yunnan Institute of Technology , Kunming , ChinaSUN Zhenbao WU Baorong Central Iron and Steel Research Institute , Ministry of Metallurgical Industry , Beiiing , China YONG Qilong , Department of Mechanical Engineering , Yunnan Institute of Technology , Kunming , China

金属学报(英文版)

According to the misfitting dislocation theory,a method of theoretical calculation was devel- oped for the specific energy of the semicoherent interface between microalloy carbonitrides and austenite matrix.The calculating formulae were derived and the results were satisfactorily applied on the research works.

关键词: specific interfacial energy , null , null , null

MECHANICAL BEHAVIOUR OF GRAPHITE AND ITS ADJACENT ZONE TO MATRIX INTERFACE IN CAST IRON

HE Zerong JI Song LIN Guoxiong Fuzhou University , Fuzhou , China professor , Department of Mechanical Engineering , Fuzhou University , Fuzhou , 350002 , China

金属学报(英文版)

The micro-processes on tensile deformation and fracture of graphite-matrix interface in cast iron with ferrite matrix under SEM have been observed in situ.It was revealed that the graphite in cast iron would not be regarded as a cavity and not formed yet notch stress concentration.A new explanation on the effect of graphite on strength of cast iron was suggested.

关键词: cast iron , null , null

OXIDATION BEHAVIOUR OF HIGH Cr CAST IRON

ZHANG Anfeng Xinjiang Engineering College , Urumqi , ChinaXING Jiandong LU Wenhua Xi'an Jiaotong University , Xi'an , China associate professor , Department of Mechanical Engineering , Xi'an Jiaotong University , Xi'an 710049 , China

金属学报(英文版)

The oxidation behaviour of high Cr Cast iron was investigated at 950 and 800℃ in terms of Cr content in matrix and the amount of carbide.The morphology and types of oxide films and the microstructure of subsurface were also examined.The main conclusions are:1)The original chromium content in the matrix determines the type of oxide film and it is an important factor for the oxidation resistance of high chromium cast iron;2) The oxidation resistance improves with increasing carbide content at 950℃ because of the decomposition of the carbide,while the decompsition of the carbide do not take place at 800℃ so the oxidation resisteance do not improve with increasing carbide volume.

关键词: high chromium cast iron , null , null

EFFECT OF DYNAMIC STRAIN AGING ON LOW CYCLE FATIGUE BEHAVIOUR OF 18-8 AUSTENITIC STAINLESS STEEL

PENG Kaiping CHEN Wenzhe OIAN Kuangwu Fuzhou University , Fuzhou , China teaching assistant , Department of Mechanical Engineering , Fuzhou University , Fuzhou 350002 , China

金属学报(英文版)

Studies were made of the symmetric tensile-compressive low cycle fatigue behaviour and the influence of dynamic strain aging(DSA)pre-treatment of 18-8 austenitic stainless steel. Within the testing amplitude range of strain.±0.5 % to±1.5 %,the three processes of cyclic hardening,cyclic saturation and cyclic softening were observed.In the same amplitude of strain,the peak stress of the samples pre-treated by DSA is higher than that of solid-solu- tion and cold working pre-treatment,but no remarkable differences of the fatigue lives of them were found.TEM observation shows that the uniform and stable dislocation networks with high density form after DSA pre-treatment,which increases the cyclic peak stress.The cyclic softening results from the low dislocation density and elongated cell structure with low energy.

关键词: 18-8 austenitic stainless steel , null , null

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