不同螺纹加工工艺对300M钢材料疲劳性能的影响

打开文本图片集

中图分类号：TG142.1 文献标志码：A 文章编号：2095-2945（2025）27-0064-05

Abstract：In order to improve the fatigue limit of ultra-high strength steel 300M used in the main load-bearing structure of aireraftlandinggear，threadmillng process wasusedtoprocessthethreadsoftheoutercylinderofthelandinggear，andthe influenceofdiferenttreadprocessngprocessesonthefatiguepropertiesofthematerialwasstudiedThefatiguepropertiesof （204号 300M steelwereevaluatedthrough dimensionssuchasthreadsurfacetopography，roughness，fatigue limitand failureanalysis. Theresultsshowthatthesurfacetopographyroughnessandfatigue limitofmilldthreadsarebetterthanthoseoftapped threads，and the fatigue limit ofmilled threadsis 59% higher than that of tapped threads.

Keywords： 300M ； tapping thread;milling thread; fatigue limit; fatigue performance evaluation

40CrNi2Si2MoVA（300M）钢因其具有高的强度、横向塑性、断裂韧性和耐疲劳性及良好的抗腐蚀性，因而成为飞机起落架承力结构件最常用的材料之一[-2]。（剩余4458字）