摘要
针对钛合金Ti-6Al-4V加工表面硬化问题,通过不同切削参数下钛合金Ti-6Al-4V切削加工表面的显微硬度与微观结构检测实验研究,探索钛合金Ti-6Al-4V车削加工的表面硬化机理,分析切削参数对加工硬化与表面变质层影响规律.结果表明:进行钛合金Ti-6Al-4V车削加工时,表面层微观组织发生显著变化,但表面硬化程度不高,切削速度提高不会使表面硬化程度加剧,并有利于减少表面变质层的厚度;切削热对加工表面硬化的影响显著,切削温度升高将减弱表面层材料变形产生的应变硬化作用,表面变质层的显微硬度值低于亚表层的显微硬度值,但高于基体的显微硬度值.
According to surface work-hardening problem of alloy Ti-6Al-4V, by surface micro-hardness and micro-cosmic structure testing experiment on titanium alloy Ti-6Al-4V under different cutting parameters, surface work-hardening mechanism of titanium alloy Ti-6Al-4V turning is explored, and the impacting rules of cutting parameters on surface work-hardening and surface metamorphic layer are analyzed. The results show that titanium alloy Ti-6Al-4V surface layer microstructure changes significantly during the turning processing. However, the increasing of cut-ting speed does not aggravate surface work-hardening degree and makes for reducing surface degenerating layer thickness. In addition, cutting heat significantly influence surface work-hardening, the raising of cutting tempera-ture weakens strain hardening function which is created by surface layer material deformation. Micro-hardness of surface metamorphic layer is lower than subsurface, but higher than substrate.
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2013年第8期1052-1056,共5页
Journal of Harbin Engineering University
基金
国家自然科学基金资助项目(51205096)
中国博士后科学基金面上资助项目(2013M531056)
黑龙江省博士后基金资助项目(LBH-Z12138)
关键词
钛合金
表面加工硬化
显微硬度
表面变质层
Aluminum
Cutting
Experiments
Hardness
Strain hardening
Surfaces
Turning
