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《金属学报(英文版)》 2014-03
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Effect of Mo on High-Temperature Fatigue Behavior of 15CrNbTi Ferritic Stainless Steel

Tianlong Liu;Lijia Chen;Hongyun Bi;Xin Che;School of Materials Science & Engineering, Shenyang University of Technology;State Key Laboratory of Development and Application Technology of Automobile Steels, Baosteel Group;  
In order to understand the effect of Mo element on the high-temperature fatigue behavior of 15 CrNbTi ferritic stainless steel, the stress-controlled fatigue tests have been performed for both 15 CrNbTi and 15Cr0.5MoNbTi ferritic stainless steels at 800 °C in laboratory air. The fatigue test results indicate that the fatigue resistance of 15Cr0.5MoNbTi steel is manifestly higher than that of 15 CrNbTi steel at the maximum stress below 57 MPa; the 15Cr0.5MoNbTi steel possesses a fatigue limit of 35 MPa, which is higher than that of 15 CrNbTi steel. The TEM observations reveal that the Mo element can suppress the formation of coarsened Fe3Nb3 C precipitates and result in the fatigue resistance enhancement.The dislocation networks formed during the cyclic load favor to improve the fatigue resistance of 15Cr0.5MoNbTi steel at800 °C.
【Fund】: supported by the National Natural Science Foundation of China (No. 51134010)
【CateGory Index】: TG142.71
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