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OUT OF PILE CORROSION RESISTANCE OF NEW ZIRCONIUM ALLOYS IN 500 ℃/10 3MPa STEAM

Z.K. Li 1 , 2) , L.Zhou 1 , 2) , J.Z. Liu 1) , P.Z. Li 1) and W.J. Zhao 3) 1) Northwest Institute for Nonferrous Metal Research , Xi'an 710016 , China 2) Xi'an Jiaotong University , Xi'an 710049 , China 3) Nuclear Power Institute of China , Chengdu 610041 , China M

金属学报(英文版)

he out of pile corrosion resistance of new Zirconium alloys in 500℃/10 3MPa steam has been investigated and the effect of alloying elements, Sn,Nb,Fe,Cr on the property has been analyzed. The results show that the new alloys have better corrosion resistance than Zircaloy 4. That no nodular corrosion is found during test cycles shows the nodular corrosion resistance can be dramatically improved by addition of alloying elements Nb. The Fe/Cr ratio should be properly controlled if there is Cr addition in the alloys when developing new alloys.

关键词: zirconium alloy , null , null , null

Microstructures and Tensile Properties of Isothermally-forged Ti-47Al-2Nb-1Cr-1V and Ti-47Al-2V-1Cr Alloys

Gaowu QIN and Shiming HAO(Dept. of Materials Science and Engineering , Northeastern University , Shenyang 110006 , China)Chuanxi HAN(Northwest Institute for Nonferrous Metal Research , Xi'an 710016 , China)

材料科学技术（英文）

Microstructures and room-temperature tensile properties of isothermally-forged γ-base (γ + α2)alloys in Ti-Al-Nb-Cr-V system with different heat treatments were investigated. The results show that the microstructures of Ti-47Al-2Nb-1Cr-1V and Ti-47Al-2V-1Cr (at. pct) alloys are mainly determined by heat treating temperature in the (cr + 7) tWo-phase field, and the joint additions of Nb, Cr and V in the Ti-47Al alloy afFect Ta significantIy. The microstructure of Ti-47Al alloy with additions of Nb, Cr and V (1~2 at. pct) can be dupIex or nearly-lamellar by a suitable heat treatment after isothermal forging at 1000℃ for over 50% plastic strains.Therefore its tensile properties can be improved at room temperature.

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