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EFFECTS OF DEFORMATION ON MICROSTRUCTURE AND σ-PHASE FORMATION IN Cr_(25)Ni_(20) STAINLESS STEEL

GAO Yan LI Dejun CAO Zhiben Dalian University of Science and Technology , Dalian , Liaoning , China LI Dejun , Lecturer , Department of Materials Engineering , Dalian University of Science and Technology , Dalian , Liaoning , China

金属学报(英文版)

The microstructure of Cr_(25)Ni_(20)stainless steel under plastic deformation up to 50% has re- vealed an even distributed twins,micro-twins and deformation bands.The σ-phase formation in 800℃ aged specimens is accelerated by its nucleation at either deformation twins or recrystallized grain boundaries under less or more deformation respectively.In the recrystallized zone,the recrystallization is prior to the precipitation of σ-phase.Although recrystallization may accelerate the formation of σ-phase,it is not essential.The twins and micro-twins produced by deformation may also provide the additional nucleation sites.

关键词: plastic deformation , null , null

CORRELATION BETWEEN STRESS COMPONENTS AND STRESS CORROSION CRACKS IN BRASS Lecturer,Department of Materials Physics,University of Science and Technology Beijing,Beijing 100083,China

QIAO Lijie LIU Rui XIAO Jimei University of Science and Technology Beijing , Beijing , China

金属学报(英文版)

The effects of stress components on nucleation sites and propagation directions of stress cor- rosion cracks in brass were investigated with specimens under mode Ⅱ and mode Ⅲ loadings. The results indicated that under mode Ⅱ loading,stress corrosion cracks nucleated on the site with maximum normal stress component and propagated along the plane perpendieular to the maximum normal stress,under mode Ⅲ loading,the stress corrosion crack was not evident on the 45°plane due to the general corrosion in aqueous solution with high NH_4OH concentra- tion,while stress corroded in aqueous solution with low NH_4OH concentration, numerous cracks with spacings of 10—150μm were found on the 45°plane with maximum normal stress and no stress corrosion cracks was observed on the plane with maximum shear stress.

关键词: stress corrosion cracking , null , null , null

Li2O对CaO基钢包渣系脱磷能力影响的热力学研究

王宏明 , 李桂荣

上海金属 doi:10.3969/j.issn.1001-7208.2002.06.003

渣金平衡实验表明Li2O替代CaO基钢包渣系中等量CaO使渣系磷酸盐容量Cp提高.在此基础上进行钢液脱磷的工艺性实验,研究了Li2O含量、渣系碱度及氧化性对渣系脱磷能力的影响,并给出了控制转炉钢液在钢包中回磷及钢包渣脱磷的渣系.

关键词: CaO基渣系 , Li2O脱磷渣 , 脱磷 , 热力学

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