Improving fatigue strength of bainite/martensite dual-phase steels in very high cycle fatigue regime by refining microstructures

Very high cycle fatigue behaviors of two bainite/martensite dual-phase steels were investigated. One of the steels was cyclic rapid heat treated and its microstructures were refined. Fatigue strength of the steel is 225 MPa higher than that without refining. Observation of fracture surfaces show tha...

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Published inTheoretical and applied mechanics letters Vol. 2; no. 3; pp. 15 - 18
Main Authors Liu, Yangbo, Li, Shouxin, Yang, Zhengou, Cui, Jingyu, Gu, Jialin, Bai, Bingzhe
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.01.2012
The Chinese Society of Theoretical and Applied Mechanics
Subjects
duplex-phase steel
fatigue strength
refining microstructure
very high cycle fatigue
双相钢
循环疲劳
微观结构
炼油
疲劳强度
贝氏体
非金属夹杂物
马氏体
fatigue strength
duplex-phase steel
refining microstructure
very high cycle fatigue
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Summary:Very high cycle fatigue behaviors of two bainite/martensite dual-phase steels were investigated. One of the steels was cyclic rapid heat treated and its microstructures were refined. Fatigue strength of the steel is 225 MPa higher than that without refining. Observation of fracture surfaces show that the fatigue cracks initiate at bainites for non-refined steel and at non-metallic inclusions for the refined steel. The size of inclusions is much smaller than that of bainites which results in the improvement of fatigue strength.
Bibliography:very high cycle fatigue; duplex-phase steel; refining microstructure; fatigue strength
Very high cycle fatigue behaviors of two bainite/martensite dual-phase steels were investigated.One of the steels was cyclic rapid heat treated and its microstructures were refined. Fatigue strength of the steel is 225 MPa higher than that without refining.Observation of fracture surfaces show that the fatigue cracks initiate at bainites for non-refined steel and at non-metallic inclusions for the refined steel.The size of inclusions is much smaller than that of bainites which results in the improvement of fatigue strength.
Yangbo Liu~（1,2,a）） Shouxin Li~2 Zhengou Yang~2 Jingyu Cui~1 Jialin Gu~3 and Bingzhe Bai~3 1）Shougang Research Institute of Technology,Beijing 100043,China 2）Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China 3）Laboratory of Advanced Materials,Department of Materials Science and Engineering,Tsinghua University, Beijing 100084,China
11-5991/O3
ISSN:2095-0349
2095-0349
DOI:10.1063/2.1203105