保持时间对涡轮盘材料GH4133合金热机械疲劳性能的影响

通过在热机械循环最高温度处进入不同保持时间, 研究了保持时间对涡轮盘材料GH4133合金热机械疲劳性能及其寿命的影响. 结果表明, 对于不同保持时间,无论是同相位热机械疲劳还是反相位热机械疲劳,材料在温度升高的过程中均呈现循环软化特性,并且随着应变量的增大循环软化速率加快,在温度降低的过程中无明显的循环硬化或循环软化;而保持时间对同相位热机械疲劳寿命影响较为显著, 而对反相位热机械疲劳寿命几乎没有影响.

Influence of holding time on thermal mechanical fatigue behavior of GH4133 superalloy

The thermal mechanical fatigue (TMF) tests were performed using a specific waveform applied different holding time at maximum temperature. On the basis of the TMF tests, the influence of holding time on the behavior and the failure life of the TMF under in phase (IP) and out of phase (OP) conditions were investigated. The test results show that the cyclic softening were observed at the cyclic maximum temperature under both IP and OP condition, but no obvious cyclic softening or cyclic hardening at cyclic minimum temperature. The tests results also show that the longer of the holding time, the shorter of the in phase TMF failure life of GH4133 superalloy, and no obvious influence of holding time on the out of phase TMF failure life.