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时间:2019-11-28
《电化学充氢下2.25Cr1Mo0.25V钢氢脆敏感性研究》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第50卷第7期西安交通大学学报Vo1.5ONO.72016年7月JOURNALoFXI’ANJIAOTONGUNIVERSITYJu1.2016DOI:10.7652/xjtuxb201607014电化学充氢下2.25CrlMo0.25V钢氢脆敏感性研究胡海军,李康,武玮,程光旭,弓卫军(西安交通大学化学工程与技术学院,710049,西安)摘要:针对制造加氢反应器的主要材料2.25CrlMo0.25V钢易发生氢脆的问题,重点研究了材料氢脆发生机制,以了解该材料的氢脆敏感性。利用电化学氢渗透测试技术,通过施加阴极恒电流,使氢原子渗透进入钢中,揭示了不同环境中的氢扩散特性,同时通过结合氢渗透技术
2、和慢速率拉伸试验方法研究了钢材的氢脆敏感性。渗氢试验结果表明:随着电化学充氢电流密度的增大以及试样厚度的减小,氢扩散系数均逐渐增大;充氢温度的倒数1/T和氢扩散系数的自然对数之间存在线性关系。慢速率拉伸试验的结果表明:随着充氢电流密度的增大,钢的断裂强度、延伸率和断面收缩减小而氢脆指数增大。当充氢电流密度超过2.5×10A/cm。时,钢材表现出明显的氢脆。该试验结果可为加氢反应器材料性能评价提供理论依据。关键词:氢脆敏感性;电化学充氢;2.25Cr1MoO.25V钢;扩散系数;氢脆指数中图分类号:TG172文献标志码:A文章编号:0253-987X(2016)07—0089—07Resear
3、chontheHydrogenEmbrittlementSensitivityof2.25Cr1Mo0.25VinElectrochemicalHydrogenChargingHUHaijun,LIKang,WUWei,CHENGGuangxu,GONGWeijun(SchoolofChemicalEngineeringandTechnology,Xi’anJiaotongUniversity,Xi’an710049,China)Abstract:Thealloysteel2.25Cr1Mo0.25Vismainlyusedtomakehydrogenationreactors,whichi
4、seasilysubjecttofailureofhydrogenembrittlement.Thispaperaimstostudythemechanismofhydrogenembrittlementandunderstandthehydrogenembrittlementsensitivityofthemateria1.Withtheelectrochemicalhydrogenpermeabilitytechniqueandapplyingconstantcathodecurrenttoletthehydrogenpermeateintothesteel,thecharacteris
5、ticsofhydrogendiffusionunderdifferenttestconditionswererevealed.Meanwhile,thehydrogenemhrittlementsensitivitywasinvestigatedbycombiningthehydrogenpermeabilitytechniquewiththeslow—ratetensiletest.Thetestresultsshowedthatthehydrogendiffusioncoefficientswereincreasedwiththegrowthoftheelectrochemicalhy
6、drogenchargingcurrentdensityaswellasthereductionofsamplethickness.Thereisalinearrelationshipbetweenthereciprocalofchargingtemperature(1/T)andthenaturallogarithmofhydrogendiffusioncoefficient.Resultsofslow—ratetensiletestsshowedthatwiththegrowthofthechargingcurrentdensity,thefracturestrength,theelon
7、gationrateandtheareareductionofthesteeldecreased,whilethehydrogenembrittlementindexesincreased.Whenthehydrogenchargingcurrentdensityexceeds2.5×10。A/cm,thesteelshowedobvioushydrogenembrittlement.Thetestresul
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