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材料工程  2017, Vol. 45 Issue (5): 71-79    DOI: 10.11868/j.issn.1001-4381.2016.001134
  研究论文 本期目录 | 过刊浏览 | 高级检索 |
Mn对22%Cr双相不锈钢700℃时效σ相及韧性的影响
白于良, 杨银辉, 曹建春, 顾洋, 普靖
昆明理工大学 材料科学与工程学院, 昆明 650093
Effect of Mn on σ Phase and Toughness of 22%Cr Duplex Stainless Steel by Aging Treatment at 700℃
BAI Yu-liang, YANG Yin-hui, CAO Jian-chun, GU Yang, PU Jing
School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
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摘要 利用光学显微镜(OM)、X射线衍射仪(XRD)、扫描电镜(SEM)、透射电镜(TEM)结合析出动力学和冲击实验,研究了不同Mn含量(4.3%,6.9%,9.7%,质量分数,下同)对22%Cr节镍型双相不锈钢700℃时效析出相形成和韧性的影响。结果表明:随Mn含量由4.3%增加至9.7%,时效76h,析出形貌分别为铁素体/奥氏体(δ/γ)界面细小σ相颗粒析出和铁素体晶内σ相/二次奥氏体(γ2)共析组织。Mn含量增加使Avrami指数n减小,反应常数B增大,Mn元素参与并促进σ相析出,σ相开始析出和完全析出时间均提前,开始析出与完全析出的时间间隔增大,析出速率降低。时效过程中δ相分解量低于1%(体积分数,下同)对冲击韧度影响不大,δ相分解量由1%增至5%会显著降低冲击韧度。Mn含量增加在时效前期对冲击韧度有利,时效中期则会促使δ相分解量更早超过1%,导致冲击韧度快速下降。
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白于良
杨银辉
曹建春
顾洋
普靖
关键词 Mn含量时效σ析出动力学冲击韧度    
Abstract:The effect of different Mn contents on the σ phase and toughness of 22%Cr (mass fraction, the same below) low-nickel DSS by means of OM, XRD, SEM, TEM, precipitation kinetics and Charpy impact tests was studied. The results show that the morphology of precipitated phases changes from tiny granulated σ phase in δ/γ phase boundary to σ/γ2 eutectoid structure within δ phase with the addition of Mn from 4.3% to 9.7% and 76 hours aging. The increase of Mn content can decrease Avrami exponent n and increase reaction constant B, and the accelerating of σ-phase precipitation with higher Mn addition is due to the participation of Mn. Increasing Mn content can make initial time and ending time of σ-phase precipitation earlier and expand the interval between the initial time and ending time of σ-phase precipitation, that is, the more Mn addition, the earlier precipitation beginning time of σ-phase and the lower precipitation rate of it. The impact toughness is not sensitive to 1% transformation fraction of δ-ferrite, but it drops rapidly while the transformation fraction of δ-ferrite increases from 1% to 5%. More addition of Mn is good to impact toughness at the early stage of aging treatment, but the impact toughness decreases rapidly by accelerating the transformation fraction of δ-ferrite more than 1% earlier at the middle stage of aging time.
Key wordsMn content    aging treatment    σ phase    precipitation kinetics    impact toughness
收稿日期: 2016-09-22      出版日期: 2017-05-17
中图分类号:  TG142  
通讯作者: 杨银辉(1975-),男,副教授,博士,主要从事节镍型双相不锈钢方面研究,联系地址:云南省昆明市一二一大街文昌路68号昆明理工大学材料科学与工程学院(650093),E-mail:yyhyanr@sina.com     E-mail: yyhyanr@sina.com
引用本文:   
白于良, 杨银辉, 曹建春, 顾洋, 普靖. Mn对22%Cr双相不锈钢700℃时效σ相及韧性的影响[J]. 材料工程, 2017, 45(5): 71-79.
BAI Yu-liang, YANG Yin-hui, CAO Jian-chun, GU Yang, PU Jing. Effect of Mn on σ Phase and Toughness of 22%Cr Duplex Stainless Steel by Aging Treatment at 700℃. Journal of Materials Engineering, 2017, 45(5): 71-79.
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http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2016.001134      或      http://jme.biam.ac.cn/CN/Y2017/V45/I5/71
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