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Effects of Prestraining on High Cycle Fatigue Strength of High Strength Low Alloy TRIP Steels

机译：预应力对高强度低合金TRIP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 steels with different matrix structure and different retained austenite characteristics were investigated for the automotive applications. The prestraining to 10 percent in tension increased fatigue limit of the TRIP steels, especially in steel with polygonal ferrite matrix. It was considered that the polygonal ferrite matrix in the steel brought high fatigue limit mainly due to TRIP of the retained austenite and high compressive internal stress in the matrix, resulting from hard second phase on prestraining. On the other hand, the TRIP steel with bainitic ferrite lath matrix exhibited a small increment in fatigue limit after prestraining. This was supposed to be mainly owing to strain-induced martensite content increased by pre straining, with small effects of TRIP of retained austenite and compressive internal stress in the matrix. In 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 the low alloy TRIP 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，钢中的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和基体中的高压缩内应力所致，这是预应变过程中坚硬的第二相造成的。另一方面，具有贝氏体铁素体板条基体的TRIP钢在预应变后的疲劳极限增加很小。推测这主要是由于预应变增加了应变诱导的马氏体含量，残余奥氏体的TRIP效应和基体内的压缩内应力影响较小。另外，获得了非常有趣的发现，即内应力是提高低合金TRIP钢疲劳强度的某些参数中最有效的参数。

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