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本文采用定量金相技术,对不同锌当量、铝当量熔炼的ZHMn55-3-1、ZQAl12-8-3-2吉尔试样中a相含量作了较精确的计算。同时选择了不同a相含量的试样,系统的完成了常规力学性能与疲劳性能试验,并且研究了组织比例与性能之间的定量关系。其中疲劳试验是模拟螺旋桨在交变应力下的受力状态,采用低周疲劳进行裂纹扩展试验,测得(da/dN)-ΔK曲线,根据裂纹扩展速率da/dN来估算不同a相含量的疲劳裂纹扩展寿命。就所测得的各种性能数据来看,两者之间的定量关系具有明显的变化规律,且表明黄铜ZHMn55-3-1中a相为25%左右,青铜ZQAl12-8-3-2中a相为60%～70%左右,能获得合金最佳的综合性能。
In this paper, quantitative metallographic techniques were used to calculate the phase a content of Jmn55-3-1 and ZQAl12-8-3-2 Jill samples with different zinc equivalent and aluminum equivalent. At the same time, the samples with different content of a phase were selected. The system completed the conventional mechanical properties and fatigue properties tests, and the quantitative relationship between the proportion and the performance of the structure was studied. Among them, the fatigue test simulates the stress state of the propeller under alternating stress. The crack growth test is conducted with low cycle fatigue, and the (da / dN) -ΔK curve is measured. Based on the crack propagation rate da / dN, Fatigue crack growth life span. As far as the measured performance data are concerned, the quantitative relationship between the two has obvious variation, and shows that a phase of brass ZHMn55-3-1 is about 25%, the bronze ZQAl12-8-3-2 A phase is about 60% ~ 70%, can get the best overall performance alloy.