Effect of Machining Process Conditions on Fatigue Behavior of Magnesium Alloy AZ61
Effect of Machining Process Conditions on Fatigue Behavior of Magnesium Alloy AZ61
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加工工艺条件对AZ61镁合金疲劳行为的影响
DOI：
10.2472/jsms.68.882
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Y. Uematsu
中科院分区：
文献类型：
--
作者：
T. Kakiuchi;Y. Uematsu
对挤压变形镁合金AZ61在两种不同加工条件下进行悬臂旋转弯曲疲劳试验，研究了加工表面对疲劳性能的影响。通过机械加工，细化了近表面的晶粒，提高了硬度，并产生了残余压应力。在较低进给量和切削速度、较大前角和较大切削深度的切削条件下加工，试样的晶粒细化区深度较常规条件下加工的试样深，硬度较高，残余压应力的绝对值较高。通过机械加工工艺在表面附近具有加工影响层的试样比通过抛光完全去除加工影响层的试样表现出更高的疲劳强度。加工条件越好，疲劳强度越高。随着加工影响层抛光深度的增加，疲劳寿命降低，说明加工影响层越厚，疲劳强度越高。
The cantilever rotating bending fatigue tests were conducted using extruded wrought magnesium alloy, AZ61, specimens, which were made by the machining process under two different conditions, and the surface effect by machining process on the fatigue behavior was investigated. By the machining process, the grains near the surface were refined, the hardness increased, and the compressive residual stress was given. When the specimens were machined under severer condition where rake angle and cut depth were large, and feed rate and cutting speed were low, the depth of grain refinement area became deeper, the hardness was higher, and the absolute value of residual compressive stress was higher than the specimens machined under the conventional condition. The specimens having the work-affected layer near the surface by the machining process exhibited the higher fatigue strengths than the specimens in which the work-affected layer was totally removed by polishing. The severer machining condition resulted in the higher fatigue strengths. The fatigue lives became shorter with the increase of the polishing depth of the work-affected layer, which indicated that the thicker work-affected layer was more effective to improve the fatigue strengths.