张根元,吴晴飞,覃瑞森,熊佳龙

• 1:河海大学机电工程学院
• 2:今飞控股集团有限公司

摘要(Abstract)：

采用电化学动电位再活化(EPR)法测定了950℃固溶处理的304不锈钢敏化温度-时间-敏化(TTS)曲线,观察了敏化处理的晶间腐蚀组织形貌。建立了一维304奥氏体不锈钢敏化的物理模型,模拟了敏化过程中晶界区域富铬碳化物沉淀析出长大、相界面的溶质热力学、相界迁移动力学和基体中溶质Cr、Ni浓度分布。结果表明:贫铬区中的Cr浓度变化和有效贫铬区宽度两个参量能体现晶界腐蚀的程度,这与敏化处理的晶间腐蚀形貌观察一致;溶质Ni富集及扩散不仅改变贫铬区中溶质Fe、Cr浓度分布,而且改变富铬碳化物成分组成以及其长大速率。敏化处理时贫铬区中溶质碳化学势先升高后缓慢下降,溶质铬化学势变化与之相反;基于相界面迁移一致性的富铬碳化物长大基本符合Zener抛物线增长趋势。

关键词(KeyWords)： 贫铬区;敏化;晶间腐蚀;EPR法;模拟

Abstract:

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基金项目(Foundation):

作者(Author): 张根元,吴晴飞,覃瑞森,熊佳龙

参考文献(References)：

• [1]肖纪美.不锈钢的金属学问题[M].北京:冶金工业出版社,1983:210-224.
• [2]Was G.S,Kruger R M.A thermodynamic and kinetic basis for understanding chromium depletion in Ni-Cr-Fe alloys[J].Acta Merall,1985,33(5):841-854.
• [3]Hiroshi Arai,Seiichi Takeda,Yoshiaki Arata.Theoretical analysis of susceptibility of ferritic stainless steel to intergranular corrosion caused by welding[J].Transactions of JWRI,1987,16(1):131-137.
• [4]李长荣,张维敬,张文奇.奥氏体不锈钢敏化动力学过程模拟[J].中国腐蚀与防护学报,1989,9(4):249-260.
• [5]Sahlaoui H,Sidhom H,Philibert J.Prediction of chromium depleted-zone evolution during aging of Ni-Cr-Fe alloys[J].Acta Materialia,2002,50:1383-1392.
• [6]Sourmail T,Too C H,Bhadeshia H K D H.Sensitization and evolution of chromium depleted zones in Fe-Cr-Ni-C systems[J].ISIJ International,2003,43:1814-1820.
• [7]William E,Mayo.Predicting IGSCC/IGA susceptibility of Ni-Cr-Fe alloys by modeling of grain boundary chromium depletion[J].Materials Science and Engineering A,1997,232:129-139.
• [8]Yu Xiaofei,CHEN Shenhao.A simulation of Cr depletion in austenitic stainless steel with cellular automaton[J].Computational Materials Science.2009,45:899-904.
• [9]You Fa Yin,Roy G Faulkner.Model predictions of grain boundary chromium depletion in inconel 690[J].Corrosion Science,2007,49:2177-2197.
• [10]Terada M,Eseriba D M,Costa L,et al.Investigation on the intergranular corrosion resistance of the AISI 316L(N)stainless steel after long time creep testing at 600℃[J].Mater Charaet,2008,59:663-668.
• [11]Sahlaoui H,Makhlouf K,Sidhoma H,et al.Effects of ageing conditions on the precipitates evolution,chromium depletion and intergranular corrosion susceptibility of AISI 316L:experimental and modeling results[J].Materials Science and Engineering,2004,372:98-108.
• [12]Anders Bjarbo,Mats Hattestrand.Complex carbide growth,dissolution,and coarsening in a modified 12 Pct chromium steel-an experimental and theoretical study[M].Metallurgical and Materials Transactions A,2001,32:19-27.
• [13]金维松,郎宇平,荣凡,等.EPR法评价奥氏体不锈钢晶间腐蚀敏感性的研究[J].中国腐蚀与防护学报.2007,27(1):54-59.
• [14]李神速.双回路EPR法测定奥氏体不锈钢的敏化[J].腐蚀科学与防护技术.2000,12(5):288-291.
• [15]刘永辉,张佩芬.金属腐蚀学原理[M].北京:航空工业出版社,1993.
• [16]A.约翰.塞德赖克斯.不锈钢的腐蚀[M].北京:机械工业出版社,1986.
• [17]Vladimir C.Intergranular corrosion of steels and alloys[M].Amsterdam:Elsevier,1984.
• [18]Mattheij R M M,Rienstra S W,Ten Thije Boonkkamp J H M.Partial differential equations-modeling,analysis,computation[M].Philadelphia:Society for Industrial and Applied Mathematics,2005:71-105.
• [19]Vander Vent A,Dezaey L.Models for precipitate growth during theγ-α+γtransformation in Fe-C and Fe-C-X alloys[J].Progress in Marerials Science.1996,40:181-264.
• [20]何燕霖,朱娜琼,吴晓瑜,等.富Cr碳化物析出行为的热力学与动力学计算[J].材料热处理学报.2011,32(1):134-137.

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