拉伸过载作用下DP780双相钢疲劳裂纹扩展行为

doi:DOI：10.13228/j.boyuan.issn0449-749x.20180298

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Abstract In order to explore fatigue characteristic of DP780 dual phase steel widely used in the automobile industry，an experiment with the constant amplitude load on the compact tensile specimen were carried out. The fatigue crack growth behavior of DP780 dual phase steel subjected to single tensile overload was studied. The results shows that the increase of the overload ratio and the crack length caused by overload increases the number of delayed cycles and fatigue life. During the process of overload，a crescent moon shaped damage zone was formed at the front of the crack tip，which is characterized by cleavage surfaces，tearing ridges，dimples and voids. Due to the premature contact of the crack flank，the fracture morphology of the crack front is seriously damaged. The crack branching has no significant effect on the crack growth retardation under overload. The crack branching occurs in the overload affected zone and in the stable period after overload. However，the branching does not extend to the interior of the material.

Key words： dual phase steel fatigue crack growth overload ratio fatigue fracture

Received: 27 July 2018 Published: 25 April 2019

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LI Song-fen. Fatigue crack growth behavior of DP780 dual phase steel subjected to single tensile overload[J]. Iron and Steel, 2019, 54(3): 82-86.

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http://www.chinamet.cn/Jweb_gt/EN/DOI：10.13228/j.boyuan.issn0449-749x.20180298 OR http://www.chinamet.cn/Jweb_gt/EN/Y2019/V54/I3/82

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