金属学报  1956, Vol. 1 Issue (4): 337-421

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18/8/3/1Cr-Ni-Mo-Ti不锈钢中δ-铁素体的恒温分解

庄育智;刘嘉乐

中国科学院金属研究所;中国科学院金属研究所

THE DECOMPOSITION OF δ-FERRITE IN A Cr-Ni-Mo-Ti STAINLESS STEEL

CHUANG YU-CHIH AND LIU CHIA-LO Institute of Metal Research;Academia Sinica

庄育智;刘嘉乐. 18/8/3/1Cr-Ni-Mo-Ti不锈钢中δ-铁素体的恒温分解[J]. 金属学报, 1956, 1(4): 337-421.
, . THE DECOMPOSITION OF δ-FERRITE IN A Cr-Ni-Mo-Ti STAINLESS STEEL[J]. Acta Metall Sin, 1956, 1(4): 337-421.

摘要 参考文献 相关文章 Metrics 全文: PDF(6166 KB)   摘要: 应用金相法研究了18/8/3/1 Cr-Ni-Mo-Ti不锈钢经1300℃固溶处理后在950℃,850℃及750℃恒温分解初期金相组织的变化,并用电解分离及X射线衍射方法鉴定在不同恒温分解阶段δ-铁素体分解的产物。观察到由于提高了固溶处理温度,高温固定下来的铁素体极为不稳定,在分解为奥氏体的同时有TiC的沉淀出现。当δ→γ的转变,由于Cr,Mo等合金元素的偏聚不能继续进行时,才发现残留的δ-铁素体转变为σ-相。过去一般认为18/8型不锈钢在550—1000℃保温后,室温冲击靭性的降低是由于σ-相的沉淀所引起的,试验结果指出在σ-相出现之前,钢的冲击靭性已显著下降,这种现象可能与δ-铁素体分解初期TiC的沉淀有关。 Abstract：The decomposition of δ-ferrite at 750°,850° and 950℃ in quenched 18/8/3/1Cr-Ni-Mo-Ti stainless steel specimens has been studied microscopically,thetransformation products being electrolytically extracted and identified by X-raydiffraction method.At early stages of decomposition accicular austenite forms along certaincrystallographic planes of δ-ferrite.As a result,the remaining ferrite becomesenriched in Cr,Mo and impoverished in C,Ni,Mn,and was found to transformsubsequently to sigma which begins after heating for 5-6 minutes at 850℃.Precipitation of titanium carbide first occurs in the ferrite grains,later itmakes appearance along the ferrite-austenite interphase boundaries and along thetwinning planes within the austenite grain.The precipitation of titanium carbideseems to have no appreciable effect on the sequence of decomposition of δ-ferrite.The impact value of the steel was found to decrease very markedly before thecommencement of the δ→σ transformation and it is considered that this mightbe associated with the titanium carbide precipitation. 收稿日期: 1956-04-18      服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 庄育智 刘嘉乐 44.8K 链接本文: https://www.ams.org.cn/CN/      或      https://www.ams.org.cn/CN/Y1956/V1/I4/337 [1] Gilman,J.J.,Koh,P.K.and Zmeskal,O.,Trans.Amer.Soc.Metals,41(1949) ,1371． [2] Kirkby,H.W.and Morley,J.I.,J.Iron Steel Institute,158(1948) ,289． [3] Smith,L.and Bowen,K.W.J.,J.Iron Steel Institute,148(1948) ,295． [4] Hoar,T.P.and Bowen,K.W.J.,Trans.Amer.Soc.Metals,45(1953) ,443． [5] Bindari,A.E.,Kow,P.K.and Zmeskal,O.,Trans.Amer.Soc.Metals,43(1951) ,226． [6] #12 [7] Shirley,H.T.,J.Iron Steel Institute,174(1953) ,242． [8] 庄育智、李有柯,物理学报,10卷,4期(1954) ,321． [9] Kuo,K.(郭可信),J.Iron Steel Institute,181(1955) ,213． [10] Franks,R.,Binder,W.O.and Bishop,C.R.,Trans.Amer.Soc.Metals,29(1941) ,33． [11] #12 [12] Dulis,E.J.and Smith,G.V.,Symposium on the Nature,Occurrence,and Effects of Sigma Phase(Amer.Soc.for Testing Materials,Philadelphia,1951) ,3． [13] Barrett,C.S.,Structure of Metals(McGraw-Hill London,1953) ,249． [14] Barnett,W.I.and Troiano,A.R.,Metal Progress,53(1948) . [15] Vacher,H.C.and Bechtoldt,C.J.,J.Res.Nat.Bur.Stand.53(1954) ,67． No related articles found! Viewed Full text Abstract Cited   Shared      Discussed