论文部分内容阅读
研究了固溶冷却速率对K444合金显微组织和力学性能的影响。结果表明,控制K444合金固溶后的冷却速度,可获得不同尺寸和形状且呈双态弥散分布的γ’相;较快的固溶冷却速度可使合金中碳化物细化;冷速越大,γ’相尺寸越小,合金拉伸性能及持久寿命越好。合金经1170℃×4 h固溶后,以80℃/min冷速冷却到900℃,再经1050℃×4 h高温时效和850℃×16 h低温时效,可以获得较好的综合性能。
The effect of solution cooling rate on the microstructure and mechanical properties of K444 alloy was studied. The results show that controlling the cooling rate of K444 alloy after solution treatment, the γ ’phase with different size and shape can be obtained with bimodal dispersion distribution. The faster solid solution cooling rate can refine the carbide in the alloy. , the smaller the γ ’phase size, the better the tensile properties and long-term life expectancy of the alloy. After solid solution treatment at 1170 ℃ for 4 h, the alloy was cooled to 900 ℃ at a cooling rate of 80 ℃ / min and then aged at 1050 ℃ for 4 h and aged at 850 ℃ for 16 h.