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。
The corrosion fatigue propagation behaviours of low carbon martensitic steels20Cr2Ni4 and 20SiMnMoV have been investigated in 3.5%NaCl solution spray. The fatigue growthrates of two steels in salt spray are much higher than those in air under low △K range. A crit-ical stress intensity factor range has been observed for each steel. The crack prowth stoppagewill occure if the △K value was lower than it.
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