2205双相不锈钢在NaCl溶液中的疲劳裂纹扩展行为

发布时间：2018-01-19 05:37

本文关键词： 双相不锈钢疲劳裂纹扩展 NaCl溶液浓度　出处：《材料保护》2017年09期 　论文类型：期刊论文

【摘要】：为提高2205双相不锈钢的使用安全性,采用光学显微镜和力学性能测试等方法,研究了2205双相不锈钢在NaCl溶液中的疲劳裂纹扩展行为。结果表明:与空气中相比,2205双相不锈钢在NaCl溶液中的疲劳裂纹扩展门槛值有降低的趋势,近门槛区的裂纹扩展速率有所提高,并且裂纹扩展由近门槛区向稳态扩展区转变的临界ΔK提高;在稳态扩展阶段,NaCl溶液使裂纹扩展速率显著提高,导致疲劳寿命显著降低;当NaCl浓度在0.5%~26.6%范围内时,随着浓度的增大,稳态扩展阶段的Pairs方程参数m值呈增大趋势,C值呈减小趋势;NaCl溶液中力学和环境因素的交互作用,加速了疲劳裂纹扩展,材料一旦进入稳态扩展就更容易进入高速扩展区并最终发生断裂。
[Abstract]:In order to improve the safety of 2205 duplex stainless steel, optical microscope and mechanical properties test were used. The fatigue crack propagation behavior of 2205 duplex stainless steel in NaCl solution was studied. The fatigue crack growth threshold of 2205 duplex stainless steel in NaCl solution has a tendency to decrease, and the crack growth rate near the threshold region has been increased. Moreover, the critical 螖 K of crack propagation is increased from the near threshold region to the steady growth zone. During the steady state growth stage, the crack growth rate is significantly increased by NaCl solution, which results in a significant decrease in fatigue life. When the concentration of NaCl is within the range of 0.5% and 26.6%, with the increase of concentration, the parameter m of the Pairs equation in the steady-state extension stage increases and the value of C decreases. The interaction of mechanical and environmental factors in NaCl solution accelerates the fatigue crack growth. Once the material enters the steady state growth zone, it is easier to enter the high speed growth zone and finally fracture.
【作者单位】：辽宁石油化工大学机械工程学院;钢研纳克检测技术有限公司;
【分类号】：TG142.71
【正文快照】： 0前言双相不锈钢(DSS)由铁素体和奥氏体组成,两相比约为1∶1,双相结构使它兼具奥氏体不锈钢的优良塑性、韧性与铁素体不锈钢良好的耐蚀性,以其替代奥氏体不锈钢和铁素体不锈钢作为装备的耐腐蚀材料已成为必然趋势。Zhang等[1]研究了退火温度对2101经济型双相不锈钢2101DSS耐点

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