Effect of Fatigue Load on High-Temperature Tensile Properties of P92 Steel
摘 要
在650℃、应变控制条件下对P92钢进行了不同循环周次的疲劳试验,随后在650℃进行了拉伸性能试验,研究了疲劳载荷对该钢高温拉伸性能的影响。结果表明:经不同周次疲劳试验后,P92钢的高温拉伸性能下降,当循环周次达到20%Nf(Nf为疲劳寿命)时,抗拉强度和屈服强度分别下降了19.1%和38.6%,当循环周次高于20%Nf时,抗拉强度和屈服强度趋向稳定;疲劳试验试样的拉伸断口均呈韧性断裂特征,当循环周次由0增至20%Nf时,拉伸断口上的韧窝由小而深变为大而浅,当循环周次达到20%Nf以上时,韧窝尺寸变化不大。
Abstract
The strain controlled fatigue tests at 650℃ for different cycles, followed by the tensile property tests at 650℃, were conducted on P92 steel. The effects of fatigue load on the high-temperature tensile properties of the steel were investigated. The results show that after fatigue testing for different cycles, the high-temperature tensile properties of P92 steel decreased. When the number of cycles reached 20%Nf (Nf refers to fatigue life), the tensile strength and yield strength decreased by 19.1% and 38.6%, respectively. When the number of cycles was higher than 20%Nf, the tensile strength and yield strength tended to be stable. The tensile fractures of the fatigue tested specimens illustrated ductile fracture characteristics. The dimples on the tensile fracture changed from small and deep to big and shallow when the number of cycles increased from 0 to 20%Nf, while changed little when the number of cycles reached higher than 20%Nf.
中图分类号 TG142.1 DOI 10.11973/jxgccl201712011
所属栏目 材料性能及应用
基金项目 中国博士后科学基金资助项目(2016M600405)
收稿日期 2016/12/26
修改稿日期 2017/10/20
网络出版日期
作者单位点击查看
备注黄鑫(1991-),男,江苏徐州人,硕士研究生
引用该论文: HUANG Xin,WANG Xiaowei,ZHANG Wei,GONG Jianming. Effect of Fatigue Load on High-Temperature Tensile Properties of P92 Steel[J]. Materials for mechancial engineering, 2017, 41(12): 49~53
黄鑫,王小威,张威,巩建鸣. 疲劳载荷对P92钢高温拉伸性能的影响[J]. 机械工程材料, 2017, 41(12): 49~53
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【10】WANG X, GONG J, ZHAO Y, et al. Characterization of low cycle fatigue performance of new ferritic P92 steel at high temperature:Effect of strain amplitude[J]. Steel Research International, 2015, 86(9):1046-1055.
【11】王小威, 巩建鸣, 王艳飞,等. 统一黏塑性模型对9%~12%Cr马氏体耐热钢低周疲劳特性的数值模拟[J]. 南京工业大学学报(自然科学版), 2014, 36(6):72-77.
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