プラズマ浸炭およびFPB処理によるTi-6Al-4V合金の高疲労強度化
プラズマ浸炭およびFPB処理によるTi-6Al-4V合金の高疲労強度化
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等离子渗碳和FPB处理提高Ti-6Al-4V合金的疲劳强度
DOI：
10.2472/jsms.57.838
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
宣佳 辻
中科院分区：
文献类型：
--
作者：
辰郎 森田;隆行 大友;忠治 加賀谷;信一 田中;宣佳 辻
本研究通过等离子渗碳和细颗粒轰击（FPB）处理组成的混合表面改性来提高Ti-6Al-4V合金的疲劳强度。第一阶段等离子渗碳在1023K下进行14.4ks，形成硬化层，基体中没有显着的显微组织生长。随后进行FPB处理，以消除通过等离子渗碳在最外表面上形成的脆性化合物层（TiC）并引入压缩残余应力。结果表明，等离子渗碳略微提高了钛合金的疲劳强度。然而，这种处理大大降低了疲劳寿命，因为疲劳裂纹沿着化合物层快速扩展。当对等离子渗碳材料进一步进行FPB处理时，化合物层被完美消除，并引入了较高的残余压应力。其结果是，从表面产生的疲劳裂纹被强力抑制，裂纹产生部位存在于硬化层的下方。同时，疲劳寿命和疲劳强度均得到大幅提高，疲劳强度提高幅度最大达到30%。
This study was conducted to improve fatigue strength of Ti-6Al-4V alloy by hybrid surface modification which was composed of plasma carburizing and fine-particle bombarding (FPB) treatment. Plasma carburizing at the first stage was conducted for 14.4ks at 1023K to form a hardened layer with no remarkable growth of microstructure in the substrate. Subsequent FPB treatment was carried out to eliminate the brittle compound layer (TiC) formed on the outermost surface by plasma carburizing and to introduce compressive residual stress. The result showed that the plasma carburizing slightly increased the fatigue strength of the titanium alloy. However, this treatment greatly reduced fatigue life because fatigue cracks rapidly propagated along the compound layer. When FPB treatment was further performed for the plasma-carburized material, the compound layer was perfectly eliminated and a relatively high compressive residual stress was introduced. As a result, initiation of fatigue cracks from the surface was strongly suppressed so that the crack initiation site existed under the hardened layer. At the same time, the fatigue life and the fatigue strength were greatly improved and the maximum percentage of the improvement in the fatigue strength reached to 30%.
短时两步热处理对Ti-6Al-4V合金疲劳强度的影响
DOI：
--
发表时间：
2007
期刊：
材料 56-4
影响因子：
--
作者：
森田辰郎;信田康介;川崎一博;三阪佳孝
通讯作者：
三阪佳孝
影响因子：
1.2
作者：
Morita, T;Hatsuoka, K;Kawasaki, K
通讯作者：
Kawasaki, K