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研究了在K4242合金中调加微量Zr后,Zr对K4242合金热疲劳性能、碳化物相和裂纹形貌的影响,并与不添加Zr的K4242合金进行相关对比分析。研究结果表明,合金中添加微量元素Zr,K4242合金的热疲劳性能得到提高和改善。合金中碳化物的形貌、分布和尺寸直接导致了两类合金宏观热疲劳性能的不同。碳化物是疲劳裂纹萌生与扩展的主要部位和通道。Zr可改善碳化物的形态,使碳化物的形态成为块状且分布较分散,分散块状的碳化物及其与基体的协调作用,降低了热疲劳裂纹的扩展速率,提高了合金的热疲劳性能。
The effects of Zr on the thermal fatigue properties, carbide phase and crack morphology of K4242 alloy after adding trace amounts of Zr in K4242 alloy were investigated. The results were compared with that of K4242 alloy without Zr addition. The results show that the addition of trace elements Zr, K4242 alloy thermal fatigue properties are improved and improved. Alloy carbide morphology, distribution and size of a direct result of the two types of alloy macroscopic thermal fatigue properties. Carbide is the main site and channel of fatigue crack initiation and propagation. Zr can improve the morphology of carbides, make the carbides form into massive and dispersed, disperse massive carbides and coordinate with the matrix, reduce the rate of thermal fatigue crack growth and improve the thermal fatigue of the alloy performance.