0Cr18Ni10Ti不锈钢高温蠕变-棘轮交互作用试验研究  

Experimental Research on Creep-Ratcheting Interaction of 0Cr18Ni10Ti Stainless Steel at High Temperature

作　　者：陈佳[1] 刘宇轩 李建 阚前华[1] CHEN Jia;LIU Yuxuan;LI Jian;KAN Qianhua(School of Mechanics and Aerospace,Southwest Jiaotong University,Chengdu 611756,China;Institute of Systems Engineering,China Academy of Engineering Physics,Mianyang 621999,China)

机构地区：[1]西南交通大学力学与航空航天学院,成都611756 [2]中国工程物理研究院总体工程研究所,四川绵阳621999

出　　处：《四川轻化工大学学报（自然科学版）》2023年第6期1-7,共7页Journal of Sichuan University of Science & Engineering(Natural Science Edition)

基　　金：国家自然科学基金青年项目(12102411);四川省自然科学基金青年项目(2022NSFSC1957)。

摘　　要：工程结构件在实际服役过程中往往会承受恒定载荷和循环载荷的双重作用,严重影响相关设备的安全运行。因此,有必要对0Cr18Ni10Ti不锈钢在350℃下进行应变和应力控制的无保持时间交变载荷试验以及具有保持时间的蠕变-棘轮交互作用试验,研究不同保持类型和保持时间对其蠕变-棘轮交互作用的影响。结果表明:应变控制下,峰谷值保持的应力响应低于谷值保持和峰值保持情形,与无保持相比下降幅度为11.4%;应力幅值在峰值保持时间为30、120和300 s的下降幅度依次为5.3%、11.4%和12.7%,下降速率随着保持时间的增加逐渐减缓。在应力控制下,峰值保持的棘轮应变演化速率相较于谷值保持和峰谷值保持更快,与无保持相比棘轮应变增幅为40.2%;棘轮应变的演化与峰值保持时间呈正相关,棘轮应变在峰值保持时间为30、120和300 s的增幅依次为40.2%、50.9%和54.0%。Engineering structural components often bear the double action of constant and cyclic loadings in the service process,which seriously affects the safe operation of the equipment.Therefore,it is necessary to carry out strain-controlled and stress-controlled alternating load tests without hold time and creep-ratchet interaction tests with hold time on 0Cr18Ni10Ti stainless steel 0Cr18Ni10Ti stainless steel at 350℃to study the effects of different holding waveforms and holding times on the creep-ratcheting interaction.The results show that stress response at the peak-valley-holding obtained under strain-controlled loadings is lower than that tested at the valley-holding and peak-holding,and the decrease is 11.4%compared with the test results without holding.The stress amplitude decreases by 5.3%,11.4%and 12.7%when the peaking holding time is 30,120 and 300 s,and the decreasing rate slows down gradually with the increase of the holding time.Under stress-controlling loadings,the ratcheting strain evolution rate obtained at the peak-holding is faster than that tested at valley-holding and peak-valley-holding.The ratcheting strain increases by 40.2%compared with the test results without hold time.Furthermore,it is found that the ratcheting strain evolution rate is positively correlated with the peak-holding time.The ratcheting strain increases by 40.2%,50.9%and 54.0%when the peaking holding time is 30,120 and 300 s,respectively.

关 键 词：0Cr18Ni10Ti不锈钢 蠕变 棘轮 循环变形 加载波形 保持时间 高温 

分 类 号：O34[理学—固体力学]