机械工程材料
機械工程材料
궤계공정재료
Materials for Mechanical Engineering
2015年
11期
83-87
,共5页
田阳%陈巍峰%赵姿贞%陈旭
田暘%陳巍峰%趙姿貞%陳旭
전양%진외봉%조자정%진욱
2 .2 5 Cr1 MoV钢%低周疲劳行为%循环软化%应变比
2 .2 5 Cr1 MoV鋼%低週疲勞行為%循環軟化%應變比
2 .2 5 Cr1 MoV강%저주피로행위%순배연화%응변비
2.25Cr1MoV steel%low cycle fatigue behavior%cyclic softening%strain ratio
利用MTS 810型疲劳试验机,采用轴向应变控制的方法,研究了应变比对2．25Cr1MoV钢高温(455℃)低周疲劳行为的影响.结果表明：在455℃下,2．25Cr1MoV钢呈现明显的循环软化特性；应变比不改变该钢的循环软化特性,但会产生初始平均应力,平均应力在寿命初期阶段随着循环周次增加急剧降低,并趋为0；应变比不改变疲劳裂纹的萌生方式,且对迟滞环的形状和大小没有影响；对称循环和非对称循环的低周疲劳寿命基本一致.
利用MTS 810型疲勞試驗機,採用軸嚮應變控製的方法,研究瞭應變比對2．25Cr1MoV鋼高溫(455℃)低週疲勞行為的影響.結果錶明：在455℃下,2．25Cr1MoV鋼呈現明顯的循環軟化特性；應變比不改變該鋼的循環軟化特性,但會產生初始平均應力,平均應力在壽命初期階段隨著循環週次增加急劇降低,併趨為0；應變比不改變疲勞裂紋的萌生方式,且對遲滯環的形狀和大小沒有影響；對稱循環和非對稱循環的低週疲勞壽命基本一緻.
이용MTS 810형피로시험궤,채용축향응변공제적방법,연구료응변비대2．25Cr1MoV강고온(455℃)저주피로행위적영향.결과표명：재455℃하,2．25Cr1MoV강정현명현적순배연화특성；응변비불개변해강적순배연화특성,단회산생초시평균응력,평균응력재수명초기계단수착순배주차증가급극강저,병추위0；응변비불개변피로렬문적맹생방식,차대지체배적형상화대소몰유영향；대칭순배화비대칭순배적저주피로수명기본일치.
Low-cycle fatigue behavior of 2.25Cr1MoV steel at 455 ℃ were studied by using a MTS 810 fatigue testing system under strain-controlled conditions.The results reveal that the steel exhibited obvious cyclic softening feature.Strain ratio had no influence on cyclic softening feature but resulted in mean tensile stress.The mean stress relaxed to zero in early stage of life with the increase of cycle numbers.Fatigue crack initiation patterns had not changed by strain ratio,and hysteresis loop and fatigue life of the steel were not appreciably affected by the mean strain.The low cycle fatigue life for symmetric cycle was same with that for unsymmetirc cycle.
