对比研究了不同强度中碳TRIP钢的旋转弯曲疲劳性能和疲劳裂纹扩展速率特征. 结果表明, 对于1100 MPa和1300 MPa两种强度级别,等温淬火(AT)处理试样的旋转弯曲疲劳强度均高于淬火回火(QT)处理的试样.两种强度级别的AT样的疲劳极限与抗拉强度之比均高达0.56, 明显高于QT样的0.51--0.52, 同时, AT样的疲劳裂纹扩展速率均明显低于QT样. 此外,实验钢的抗拉强度从1100 MPa级提高到1300 MPa级,AT样与QT样的疲劳强度和疲劳裂纹扩展速率之间的差异均缩小.
Bending rotating fatigue properties and fatigue crack growth (FCG) characteristic of a medium–carbon TRIP steel at different tensile strength (Rm) levels were investigated. The results show that the fatigue limits σ−1 of austempering (AT) specimens are higher than those of quenching and tempering (QT) specimens at the strength levels of 1100 MPa and 1300 MPa. The ratios of σ−1 to Rm (σ−1/Rm) of AT specimens can reach 0.56, which are higher than those of QT specimens (0.51 ~ 0.52), and the FCG results show that the stage–Ⅱ fatigue crack growth rates da/dN of AT specimens are lower than those of QT specimens at the same tensile strength level. Moreover, the differences in fatigue limit and da/dN between AT and QT conditions decreased with the increase of tensile strength from 1100 MPa to 1300 MPa.
参考文献
| [1] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%