Bias Voltage for Avoiding Fatigue Strength Degradation Due to TiAlN Coating on Ti-Alloy Substrates
Bias Voltage for Avoiding Fatigue Strength Degradation Due to TiAlN Coating on Ti-Alloy Substrates
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DOI：
10.1007/s11665-021-05468-y
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发表时间：
2021-01
影响因子：
2.3
通讯作者：
NithyaGnana Poorani Sivagnanam Chandra;Y. Otsuka;Y. Mutoh;Kenji Yamamoto
中科院分区：
文献类型：
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作者：
NithyaGnana Poorani Sivagnanam Chandra;Y. Otsuka;Y. Mutoh;Kenji Yamamoto
通过对TiAlN涂层钛合金的疲劳强度试验，研究了避免疲劳强度下降、保证TiAlN涂层钛合金疲劳强度提高的涂层工艺条件。在相同的应力幅下，随着偏压的降低，试样的疲劳寿命比未涂覆试样的短，而随着偏压的增加，试样的疲劳寿命比未涂覆试样的长。这种现象主要是由于涂层的残余压应力随偏压的增加而增加所致。从目前的结果，施加的应力和偏置电压之间的临界关系，给出了较短和较长的寿命之间的边界。从这种关系中发现，在疲劳极限水平，疲劳寿命的TiAlN涂层钛合金试样将不会降低，但增强相比，未涂覆的试样，无论偏压。当应力幅值高于疲劳极限时，需要较高的偏置电压以避免疲劳寿命下降。
Fatigue strength tests of TiAlN coated Ti-alloys were carried out to investigate the coating process condition for avoiding the degradation of fatigue strength and ensuring the enhanced fatigue strength of TiAlN coated Ti-alloys. At the same applied stress amplitude, fatigue lives became shorter than the uncoated specimen with decreasing bias voltage, while they became longer than the uncoated specimen with increasing bias voltage. This phenomenon results mainly from that the compressive residual stress of the coating layer increases with increasing bias voltage. From the present results, the critical relationship between applied stress and bias voltage to give the boundary between shorter and longer lives was obtained. It was found from this relationship that at fatigue limit level, fatigue life of the TiAlN coated Ti-alloy specimen would be not degraded but enhanced compared to the uncoated specimen regardless of bias voltage. While, the higher bias voltage was required for avoiding the degraded fatigue life at stress amplitudes higher than the fatigue limit.