Incoloy800H合金晶间腐蚀敏化条件实验
采用硫酸-硫酸铜腐刻实验和双环动电位电化学再活化(DL-EPR)实验研讨Incoloy800H合金晶间腐蚀敏感性,剖析敏化温度与敏化时刻对Incoloy800H合金晶间腐蚀敏感性的影响。分别采用光学显微镜、扫描电子显微镜和X射线能谱对Incoloy800H合金敏化试样的微观结构和DL-EPR测试后的外表形貌、外表元素进行表征。结果表明:跟着敏化温度升高和敏化时刻延伸,Incoloy800H合金的晶间腐蚀敏感性先增大后减小,在750℃敏化处理4 h后Incoloy800H合金的敏化程度最大,再活化率达到71.8%;高温环境下,碳化物在Incoloy800H合金晶界析出形成贫铬区,导致Incoloy800H合金呈现晶间腐蚀倾向;当敏化温度和敏化时刻超越临界值时,贫铬区发生铬元素的自修复,晶间腐蚀敏感性显着减小。
Sensitization condition test for intergranular corrosion of Incoloy800H alloy
The sensitivity of Incoloy800H alloy to intergranular corrosion was studied using sulfuric acid copper sulfate etching test and double loop potentiodynamic electrochemical reactivation (DL-EPR) test, and the effects of sensitization temperature and sensitization time on the sensitivity of Incoloy800H alloy to intergranular corrosion were analyzed. The microstructure of Incoloy800H alloy sensitized samples and the surface morphology and surface elements after DL-EPR testing were characterized using optical microscopy, scanning electron microscopy, and X-ray energy spectrum, respectively. The results show that as the sensitization temperature increases and the sensitization time prolongs, the intergranular corrosion sensitivity of Incoloy800H alloy first increases and then decreases. After sensitization treatment at 750 ℃ for 4 hours, the sensitization degree of Incoloy800H alloy is the highest, and the reactivation rate reaches 71.8%; Under high temperature conditions, carbides precipitate at the grain boundaries of Incoloy800H alloy to form chromium poor areas, leading to intergranular corrosion tendency of Incoloy800H alloy; When the sensitization temperature and sensitization time exceed the critical values, self repair of chromium elements occurs in the chromium poor area, and the sensitivity to intergranular corrosion is significantly reduced.
注：投诉基本信息、投诉问题为当事人在全国12315平台投诉时自行填写。
注：投诉基本信息、投诉问题为当事人在全国12315平台投诉时自行填写。
不同热处理冷却方法对Incoloy800H合金焊接接头安排及性能的影响
使用常温拉伸(Rm)、硬度(HV10)及金相安排剖析等方法,研讨了不同热处理制度对Incoloy 800H合金焊接接头力学性能及安排的影响,并对其机理进行了剖析。研讨表明,在稳定化热处理时采取不同的冷却方法后,焊接接头室温拉伸指标改变较小;水冷却后焊接接头硬度显着下降,炉冷却后硬度下降较小;水冷较空冷热影响区金相显微奥氏体晶粒度显着变细,冷却速度越快孪晶数量变多从而使的焊接接头热影响区及母材的耐腐蚀性增强。
The effect of different heat treatment cooling methods on the microstructure and properties of Incoloy800H alloy welded joints
The influence of different heat treatment regimes on the mechanical properties and microstructure of Incoloy 800H alloy welded joints was studied using methods such as room temperature tensile testing (Rm), hardness testing (HV10), and metallographic analysis, and the mechanism was analyzed. Research has shown that after adopting different cooling methods during stabilization heat treatment, the room temperature tensile index of welded joints changes less; The hardness of welded joints significantly decreases after water cooling, and the decrease in hardness is relatively small after furnace cooling; Compared to air cooling, water cooling significantly reduces the grain size of austenite in the metallographic microstructure of the heat affected zone, and the faster the cooling rate, the more twin crystals there are, thereby enhancing the corrosion resistance of the welded joint heat affected zone and the base material.
应力和水化学参数对Incoloy800H合金晶间腐蚀的影响实验
应用静态浸泡和动电位极化曲线丈量,并结合金相显微镜调查,实验研讨了某核电机组蒸汽发生器发动过程中应力和水化学参数对Incoloy800H合金晶间腐蚀的影响。结果表明:应力效果显着进步了Incoloy800H合金晶间腐蚀敏感性,且跟着应力增大晶间腐蚀敏感性增强;氯离子质量浓度、溶解氧量和p H值等水化学参数对Incoloy800H合金晶间腐蚀具有显着影响,下降氯离子质量浓度和溶解氧量、进步p H值,可有效抑制Incoloy800H合金晶间腐蚀的发生。
Experimental study on the influence of stress and hydrochemical parameters on intergranular corrosion of Incoloy800H alloy
The effects of stress and hydrochemical parameters on intergranular corrosion of Incoloy800H alloy during the start-up process of a steam generator in a nuclear power plant were experimentally studied using static immersion and dynamic potential polarization curve measurement, combined with metallographic microscopy observation. The results showed that stress significantly increased the intergranular corrosion sensitivity of Incoloy800H alloy, and the intergranular corrosion sensitivity increased with increasing stress; The hydrochemical parameters such as chloride ion mass concentration, dissolved oxygen, and pH value have a significant impact on the intergranular corrosion of Incoloy800H alloy. Reducing the chloride ion mass concentration, dissolved oxygen, and increasing pH value can effectively inhibit the occurrence of intergranular corrosion of Incoloy800H alloy.
alloy晶间合金andjoints发布于：上海市声明：该文观点仅代表作者本人，搜狐号系信息发布平台，搜狐仅提供信息存储空间服务。