1Cr18Ni9钢螺旋压缩弹簧应力松弛机理  

Stress relaxation mechanism of 1Cr18Ni9 steel helical compression spring

作　　者：农鑫 高金忠 吴俊武 师春生 赵乃勤[1] Nong Xin;Gao Jinzhong;Wu Junwu;Shi Chunsheng;Zhao Naiqin(School of Materials Science and Engineering,Tianjin University,Tianjin 300350,China;Aerospace Systems Engineering Shanghai,Shanghai 201108,China)

机构地区：[1]天津大学材料科学与工程学院,天津300350 [2]上海宇航系统工程研究所,上海201108

出　　处：《金属热处理》2022年第1期106-112,共7页Heat Treatment of Metals

摘　　要：为了揭示1Cr18Ni9奥氏体不锈钢螺旋压缩弹簧的抗应力松弛性能优异的主要原因,在100、140、180和220℃下分别对弹簧进行了长达960 h的应力松弛试验。结果发现,经过松弛试验后,弹簧的自由长度变化较小。松驰温度为100℃时,在松驰过程中一阶段和二阶段间的拐点相较于其他松驰温度不明显,这是由松驰机理不同所导致的。此外,1Cr18Ni9奥氏体不锈钢螺旋压缩弹簧在100℃松弛时的塑性变形方式以位错的多滑移为主,而在更高的温度则以多滑移和孪生的方式发生塑性变形。In order to find the main reasons for the excellent resistance to stress relaxation of helical compression spring made of 1 Cr18 Ni9 austenitic stainless steel, stress relaxation tests at 100, 140, 180, and 220 ℃ were carried out. It is found that the free length of the spring changes little after relaxation test, butthe inflection point between the first stage and the second stage is not obvious during the process of relaxation at 100 ℃, which can be attributed to the difference in relaxation mechanism at different temperatures. Besides, the plastic deformation in 1 Cr18 Ni9 austenitic stainless steel helical compression spring is mainly multi-slip of dislocation under 100 ℃, but the plastic deformation occurs in a combination way of multiple slip and twinning at elevated temperatures.

关 键 词：1CR18NI9钢 应力松弛 松弛机制 塑性变形 

分 类 号：TG142.75[一般工业技术—材料科学与工程]