浩宏奇
,
宋余九
金属学报
本文研究了低碳Cr-Ni钢和低碳Si-Mn钢在3.5％NaCl盐雾介质中的疲劳裂纹扩展行为。试验结果表明:盐雾介质显著降低了疲劳裂纹萌生期,在试验的两种频率下,裂纹扩展dα/dN-ΔK曲线上出现了与ΔK无关的平台,且存在一临界应力强度因子幅ΔK值,高于此值,裂纹起裂且能连续扩展;低于此值,裂纹扩展易发生止裂现象。
关键词:
盐雾
,
initiation period
,
crack growth stoppage
,
closure effect
HAO Hongqi SONG Yujiu Xi'an Jiaotong University
,
Xi'an
,
China Institute of Metallic Materials and Strength
,
Xi'an Jiaotong University
,
Xi'an
,
China
金属学报(英文版)
The corrosion fatigue propagation behaviour of high strength low alloy Cr-Ni and Si-Mn steels has been investigated in 3.5 %NaCl solution spryly at the frequencies of 0.1 and 5.5 Hz. It was shown that the fatigue crack initiation resistances of the two steels are significantly re- duced in salt spray;the fatigue crack growth rates of steels increase with the decrease of fre- quency and are much higher in salt spray than in air within low ΔK range.A critical stress in- tensity factor was observed for each steel and the crack growth stoppage will occur if the ΔK values are lower than it.It was found that the active dissolution makes great contribution to the fatigue crack growth within low ΔK range.
关键词:
salt spray
,
null
,
null
,
null
