拉伸保載對(duì)2.25Cr1MoV鋼高溫低周疲勞行為的影響
發(fā)布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新時(shí)間：2016-03-31
利用液壓疲勞試驗(yàn)機(jī), 采用軸向應(yīng)變控制方法在455 ℃下對(duì)2.25Cr1MoV鋼進(jìn)行高溫低周疲勞試驗(yàn), 通過在峰值應(yīng)變拉伸時(shí)保載0,60,600 s, 研究了拉伸保載時(shí)間對(duì)該鋼低周疲勞行為的影響, 并用掃描電鏡對(duì)斷口形貌進(jìn)行了觀察。
拉伸保載對(duì)2.25Cr1MoV鋼高溫低周疲勞行為的影響Effect of Tensile Holding on High Temperature Low Cycle Fatigue Behavior of 2.25Cr1MoV Steel利用液壓疲勞試驗(yàn)機(jī), 采用軸向應(yīng)變控制方法在455 ℃下對(duì)2.25Cr1MoV鋼進(jìn)行高溫低周疲勞試驗(yàn), 通過在峰值應(yīng)變拉伸時(shí)保載0,60,600 s, 研究了拉伸保載時(shí)間對(duì)該鋼低周疲勞行為的影響, 并用掃描電鏡對(duì)斷口形貌進(jìn)行了觀察。結(jié)果表明: 2.25Cr1MoV鋼呈明顯的循環(huán)軟化特性, 拉伸保載會(huì)明顯降低循環(huán)應(yīng)力幅, 但保載時(shí)間對(duì)循環(huán)應(yīng)力幅的影響不大; 拉伸保載使該鋼的疲勞壽命降低, 但保載時(shí)間超過60 s后, 疲勞壽命基本不受保載時(shí)間的影響; 拉伸保載沒有改變?cè)囼?yàn)鋼的疲勞斷裂模式。
High temperature low cycle fatigue test was carried out on 2.25Cr1MoV steel by using a hydraulic fatigue testing system under strain-controlled mode at 455 ℃. Different tensile hold time (0, 60, 600 s) was imposed at peak strain to study the effect of tensile holding load time on low cycle fatigue behavior of the steel. The fracture morphology of the steel was observed by scanning electron microscopy. The results reveal that the steel showed cyclic softening characteristics. The applied tensile holding load caused the stress amplitude obviously reduced, but the holding load time had little effect on cyclic stress amplitude. The fatigue life of the steel decreased because of tensile holding, but the life changed little when holding time exceeded 60 s.The fracture mode was not changed by the tensile holding load.
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