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首页> 外文期刊>Materials Science Research International >Effects of Prestraining on High-Cycle Fatigue Strength of High-Strength Low Alloy TRIP-Aided Steels
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Effects of Prestraining on High-Cycle Fatigue Strength of High-Strength Low Alloy TRIP-Aided Steels

机译：预应变对高强度低合金TRIP辅助钢高周疲劳强度的影响

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摘要

The effects of prestraining on high-cycle fatigue strength of newly developed low alloy TRIP-aided steels with different matrix structures and different retained austenite characteristics were investigated for automotive applications. Prestraining to 10% in tension increased the fatigue limit of the TRIP-aided steels, especially in steel with a polygonal ferrite matrix. It was considered that the polygonal ferrite matrix brought on high a fatigue limit mainly due toTRIP of the retained ausrtenite and high compressive internal stress in the matrix resulting from a hard second phase on prestraining. On the other hand, the steel with bainitic ferrite lath matrix exhibited only a small increase in the fatigue limit after prestraining. This was expected to be mainly due to "strain-induced martensite hardening" on prestraining, with small contributions of TRIP of compressive internal stress in the matrix, to addition, a very interesting finding was obtained that the internal stress is the most effective parameter among some parameters to increase the fatigue strength in low alloy TRIP-aided steels.
机译：研究了预应变对新开发的具有不同基体结构和不同残余奥氏体特性的低合金TRIP辅助钢的高周疲劳强度的影响，以用于汽车应用。将张力预紧至10％会增加TRIP辅助钢的疲劳极限，尤其是在具有多角形铁素体基体的钢中。可以认为，多边形铁素体基体具有较高的疲劳极限，这主要是由于残余奥氏体的TRIP和预应变过程中坚硬的第二相在基体中产生的高压缩内应力所致。另一方面，具有贝氏体铁素体板条基体的钢在预应变后的疲劳极限仅表现出很小的增加。预期这主要是由于预应变时的“应变诱发马氏体硬化”，基体中压缩内部应力的TRIP贡献很小，此外，获得了一个非常有趣的发现，即内部应力是其中最有效的参数。一些参数以提高低合金TRIP辅助钢的疲劳强度。

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