不同强度中碳TRIP钢的高周疲劳破坏行为

材料研究学报

2008, Vol. 22

Issue (6): 629-633

研究论文

本期目录 | 过刊浏览

不同强度中碳TRIP钢的高周疲劳破坏行为

班丽丽^1;2;惠卫军^1;2†;雍岐龙^1;2;翁宇庆^2;3;董瀚²

1.昆明理工大学材料与冶金工程学院昆明 650093
2.钢铁研究总院结构材料研究所北京 100081
3.中国金属学会北京 100711

High cycle fatigue behavior of medium–carbon trip steel at different tensile strength levels

BAN Lili^1;2; HUI Weijun^1;2†; YONG Qilong^1;2; WENG Yuqing^2;3; DONG Han²

1.Faculty of Materials and Metallurgical Engineering; Kunming University of Science and Technology; Kunming 650093
2.Institute for Structural Materials; Central Iron & Steel Research Institute; Beijing 100081
3.The Chinese Society for Metals; Beijing 100711

引用本文:

班丽丽惠卫军雍岐龙翁宇庆董瀚. 不同强度中碳TRIP钢的高周疲劳破坏行为[J]. 材料研究学报, 2008, 22(6): 629-633.
, , , , . High cycle fatigue behavior of medium–carbon trip steel at different tensile strength levels[J]. Chin J Mater Res, 2008, 22(6): 629-633.

全文: PDF(1106 KB)

摘要:

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.

关键词 ：金属材料, TRIP钢, 抗拉强度, 等温淬火, 疲劳性能

Abstract：

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 R_m (σ₋₁/R_m) 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.

Key words： metallic materials TRIP steel tensile strength austempering fatigue property

收稿日期: 2008-03-27

ZTFLH:

TG142

基金资助:

国家重点基础研究发展规划(973)(2004CB619104)

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