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Effects of Temperature and Pressure on Stress Corrosion Cracking Behavior of 310S Stainless Steel in Chloride Solution

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Chinese Journal of Mechanical Engineering 2017年第1期30卷 200-206页

作者： ZHONG Yunpan ZHOU Cheng CHEN Songying WANG Ruiyan Key Laboratory of High-efficiency and Clean Mechanical Manufacture Shandong UniversityJinan 250061China Qingdao Boiler and Pressure Vessel Supervisory Institute Qingdao 266071China

310S is an austenitic stainless steel for high temperature applications, having strong resistance of oxidation, hydrogen embrittlement and corrosion. Stress corrosion cracking（SCC） is the main corrosion failure mode for 310S stainless steel. Past researched about SCC of 310S primarily focus on the corrosion mechanism and influence of temperature and corrosive media, but few studies concern the combined influence of temperature, pressure and chloride. on SCC of 310S stainless steel, prepared samples are investigated via For a better understanding of temperature and pressure＇s effects slow strain rate tensile test（ssrt） in different temperature and pressure in NACE A solution. The result shows that the SCC sensibility indexes of 310S stainless steel increase with the rise of temperature and reach maximum at 10MPa and 160~C, increasing by 22.3% compared with that at 10 MPa and 80 ℃. Instead, the sensibility decreases with the pressure up. Besides, the fractures begin to transform from the ductile fracture to the brittle fracture with the increase of temperature. 310S stainless steel has an obvious tendency of stress corrosion at 10MPa and 160℃ and the fracture surface exists cleavage steps, river patterns and some local secondary cracks, having obvious brittle fracture characteristics. The SCC cracks initiate from inclusions and tiny pits in the matrix and propagate into the matrix along the cross section gradually until rupture. In particular, the oxygen and chloride play an important role on the SCC of 310S stainless steel in NACE A solution. The chloride damages passivating film, causing pitting corrosion, concentrating in the cracks and accelerated SSC ultimately. The research reveals the combined influence of temperature, pressure and chloride on the SCC of 310S, which can be a guide to the application of 310S stainless steel in super-heater tube.

关键词： 310S stainless steel ssrt stress corrosion chloride temperature

Effects of Different Electrolytes on Stress Corrosion Properties of 2A12 Aluminum Alloy

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Journal of Wuhan University of Technology(Materials Science) 2021年第3期36卷 400-406页

作者： JIANG Gen BAI Zhenhai LUO Binghui WANG Shuai HE Chuan School of Materials Science and Engineering Central South UniversityChangsha 410083China Key Laboratory for Nonferrous Ma-terials(MOE) Changsha 410083China

The stress corrosion cracking(SCC)behaviors of 2A12 aluminum alloy after annealing treatment were studied by slow strain rate testing(ssrt),electrochemical polarization measurement,scanning electron microscope(SEM),energy dispersive spectrometer(EDS)and transmission electron microscopy(TEM).Various concentrations of NaCl,H_(2)SO_(4)and HCl aqueous solution were prepared to act as the corrosive *** experimental results show that regarding the SCC,2A12 alloy performs best in NaCl solution but worst in HCl solution and intermediately between the above mentioned two cases in H_(2)SO_(4)*** the ssrt carried out in room temperature,there is a higher decrease in elongation without large strength loss for the alloy immersed in NaCl *** the test conducted in H_(2)SO_(4)solution,there is a higher strength loss and a relatively less loss of elongation compared to the one immersed in NaCl *** the test conducted in HCl solution,there is a relativel level loss of strength and elongation compared to either result carried out in NaCl solution or H_(2)SO_(4)solution.

关键词： 2A12 aluminum alloy stress corrosion cracking corrosive electrolyte ssrt

Stress corrosion cracking of L360NS pipeline steel in sulfur environment

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Petroleum 2017年第3期3卷 377-383页

作者： Zhou Fan Xiaogang Hu Jianyi Liu Hongchuan Li Jinwen Fu School of Materials Science and Engineering Southwest Petroleum UniversitySichuan 610500China State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversitySichuan 610500China SINOPEC Pipeline Transportation and Storage Company Nanjing 210000China

Slow strain rate test(ssrt)and tensile fracture observation are applied to study the stress corrosion cracking(SCC)of L360NS pipeline steel.5.0 wt.%sodium chloride solution containing elemental sulfur and 0.5 wt.%glacial acetic acid solution containing elemental sulfur are *** results show that brittle fracture mainly occurs on the samples in high sulfur *** the sulfur suspension solution,the SCC sensitivity of L360NS pipeline steel increases along elemental sulfur *** sulfur melting cladding condition,obvious corrosion can be observed with a large amount of corrosion pits appearing on the gauge section of the *** corrosion products are Fe1txS,black easily detached,and *** sulfur suspension and sulfur melting cladding conditions,stress oriented hydrogen induced cracking(SOHIC)is the main cracking,which is caused by the joint effect of SCC and hydrogen induced cracking(HIC).

关键词： Sour gas field Elemental sulfur ssrt SCC

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8090铝锂合金的氢脆敏感性研究

材料保护 1999年第12期32卷 29-30页

作者：袁劲松吴海峰秦熊浦华东船舶工业学院材料工程系镇江212003 西北工业大学西安710023

采用M351测量系统测试了8090铝锂合金在3.5％NaCl溶液中的腐蚀行为，并用ssrt测试技术研究了阴极极化下合金的氢脆敏感性，结果表明：充氮介质和时效制度对合金的氢脆敏感性影响较大，强烈渗氢条件下，氢可能成为腐蚀断裂的主要因素．

关键词：氢脆铝锂合金 ssrt 敏感性腐蚀

阴极极化对10Ni9CrMoV高强钢氢脆敏感性的影响

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钢铁研究学报 2020年第5期32卷 416-422页

作者：尹鹏飞李向阳陆文萍韩冰杨朝晖张波钢铁研究总院北京100081 青岛钢研纳克检测防护技术有限公司山东青岛266071

采用电化学测试﹑慢应变速率拉伸实验(ssrt)并结合断口形貌观察,研究了海水环境中阴极极化对10Ni9CrMoV钢氢脆敏感性的影响。结果表明:随阴极极化程度加强,阴极反应控制步骤逐步由氧的去极化反应转变为氢的去极化反应;随阴极极化电位负... 详细信息

采用电化学测试﹑慢应变速率拉伸实验(ssrt)并结合断口形貌观察,研究了海水环境中阴极极化对10Ni9CrMoV钢氢脆敏感性的影响。结果表明:随阴极极化程度加强,阴极反应控制步骤逐步由氧的去极化反应转变为氢的去极化反应;随阴极极化电位负移,10Ni9CrMoV钢的强度没有明显变化,但其断面收缩率和伸长率均减小,断口形貌由韧窝型韧性断裂向解理断裂转变,氢脆敏感性提高;当极化电位为-926 mV时,氢脆系数达到25%,说明10Ni9CrMoV钢在海水中的最高保护电位为-926 mV。

关键词： 10Ni9CrMoV钢阴极极化氢脆高强钢 ssrt

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加氢反应器壁材料的氢损伤特性

中国腐蚀与防护学报 2003年第3期23卷 149-155页

作者：徐坚钟曼英郭世行 D Hardie 中国计量学院机械与电子工程分院杭州310034 英国纽卡斯尔大学机械材料与制造工程系

研究了在模拟加氢反应器工况条件下 ,国产加氢反应器壁材料 [2 (1/ 4 )Cr - 1Mo及其上的 30 9L和 347L不锈钢堆焊层 ]的氢损伤特性 .结果表明 :热渗氢后 ,明显降低了它们的断裂应力 (σf)和塑性 .对于 30 9L和 347L堆焊层 ,未经热渗氢... 详细信息

研究了在模拟加氢反应器工况条件下 ,国产加氢反应器壁材料 [2 (1/ 4 )Cr - 1Mo及其上的 30 9L和 347L不锈钢堆焊层 ]的氢损伤特性 .结果表明 :热渗氢后 ,明显降低了它们的断裂应力 (σf)和塑性 .对于 30 9L和 347L堆焊层 ,未经热渗氢的原始试样 ,无论是光滑试样还是缺口试样 (除缺口位置在 30 9L区域试样外 )均断裂在 347L区域内 .而经热渗氢后 ,无论是起裂于 2 (1/ 4 )Cr - 1Mo和 30 9L的熔合线 ,还是 30 9L和 347L的熔合线处 ,最后都断在30 9L区域内 (除缺口位置在 347L区域试样外 ) .这是因为热渗氢使 30 9L和 347L的σf 分别从原始状态的 885MPa降至 4 78MPa和从原始状态的 799.9MPa降至 5 6 4MPa ;在对短裂纹的低周疲劳特性研究中 ,用da/dN =C(ΔJ) n计算了裂纹扩展速度 (da/dN)和门槛值 (ΔJth) .经热渗氢后 ,ΔJth有明显的下降 ,da/dN～ΔJ曲线也向左移 ,提高了da/dN .SEM断口分析结果与上述结论一致 .裂纹扩展以穿晶为主 ,热渗氢后有二次裂纹存在 .说明热渗氢降低了其力学性能。

关键词：承载材料堆焊层热渗氢 ssrt 低周疲劳

Prefrontal AMPA receptors are involved in the effect of methylphenidate on response inhibition of rats

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Prefrontal AMPA receptors are involved in the effect of meth...

Effect of temperature on the stress corrosion cracking of 304 Laustenitic stainless steels in alkaline solution

中国神经科学学会第十二届全国学术会议

作者： Dong-Dong Zhang Zheng-Wei Hu Xue-Han Zhang Institutes of Brain Science and State Key Laboratory of Medical Neurobiology Fudan University

Response inhibition is a critical executive control function in many species. Deficit in response inhibition have been seen in many disorders, e.g. attention deficit/hyperactivity disorder（ADHD）. Methylphenidate（MPH;Ritalin?） is a psychostimulant widely used for the treatment of ADHD and effectively improves response inhibition in individuals with ADHD and normal subjects. However, its mechanism of improving response inhibition was still unknown. The stop-signal task（SST） is a unique behavior task for response inhibition through measuring the covert latency of stop process and widely used from human to rodent. Here, we adopted a rodent nose-poking version of SST to examine response inhibition by estimating the stop signal reaction time（ssrt） on rats. MPH was administered subcutaneously 25 minutes before SST test. Intra-PFC infusion of drugs were performed via stainless guide cannulas implanted one week ago. Our results showed a baseline-dependent effect of MPH on response inhibition of rats. Subcutaneous administration of MPH only shortened ssrts of rats with larger baseline ssrts, thereby response inhibition of these rats being improved. The effect of MPH on response inhibition still remained at 3 hours after MPH infusion. Inhibition of the upregulation of glutamate receptor expression on the plasma membrane of the PFC abolished the improvement of MPH on response inhibition. Specifically, effect of MPH on ssrt of rats was abolished by intra-PFC infusion of a selective AMPAR antagonist. In conclusion, AMPA receptors in the PFC are involved in the effect of MPH on response inhibition of rats.

关键词： MPH AMPA receptors ssrt Response inhibition PFC

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Effect of temperature on the stress corrosion cracking of 30...

20CrMo钢表面喷涂有机硅改性聚脲的腐蚀行为

2014中国功能材料科技与产业高层论坛

作者： Liuyi Huang Huaiqiu Zhu Fangfang Zhang Xiaowei Wang Zhejiang Provincial Special Equipment Inspection and Research Institute

A slow strain rate tensile（ssrt）test was carried out to investigate the stress corrosion cracking（SCC）behavior of the sensitized 304L austenitic stainless steels（ASSs）in alkaline solution（0.5M NaOH）.Mechanical properties and fracture morphology evolutions of the 304L ASSs were studied as a function of temperature through slow speed tensile tester and scanning electron microscopy（SEM）.The results showed that the tensile strengthand percentage elongation after fracture significantly reduced as the test temperature *** examination revealed both ductile and brittle fracture features for the specimens tested in different ***,the proportion of brittle fracture characteristics changed with the temperature.

关键词： Stress Corrosion 304L stainless steel ssrt Alkaline solution

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热加工工艺 2012年第18期41卷 154-156页

作者：赵斌王炳英侯振波师清豪中国石油大学(华东)机电工程学院山东青岛266555

通过在20CrMo钢试样上喷涂有机硅改性聚脲涂层,用粘结力测试仪和显微硬度计对涂层的粘结力和硬度进行测试,采用恒温井液浸泡试验和高温高压腐蚀试验测试了涂层的耐蚀性能,结合扫描电镜(SEM)观察腐蚀形貌,并计算腐蚀速率,采用慢应变速率... 详细信息

通过在20CrMo钢试样上喷涂有机硅改性聚脲涂层,用粘结力测试仪和显微硬度计对涂层的粘结力和硬度进行测试,采用恒温井液浸泡试验和高温高压腐蚀试验测试了涂层的耐蚀性能,结合扫描电镜(SEM)观察腐蚀形貌,并计算腐蚀速率,采用慢应变速率拉伸试验(ssrt)对涂层抗应力腐蚀性能进行分析。结果表明:腐蚀后涂层与基体宏观附着良好,能有效阻止腐蚀溶液的渗透和侵蚀;20CrMo钢经过喷涂聚脲处理后,腐蚀速率减小了一个数量级,耐蚀性能提高;应力腐蚀条件下,喷涂聚脲试样的应变量和最大应力值比基体分别增加了22%和2.7%,断裂时间延长约6.5 h,延长了基材的使用寿命。

关键词： 20CrMo钢聚脲涂层耐蚀性 ssrt