侯家平,潘涛,朱莹光,苏航,杨才福,张万山

• 1:鞍钢集团公司钢铁研究院
• 2:钢铁研究总院工程用钢研究所

摘要(Abstract)：

研究了临界淬火热处理(QLT)工艺对LNG工程用9Ni低温钢力学性能及精细组织的影响。与常规调质(QT)工艺的对比研究显示,QLT工艺在略微降低强度水平的情况下,显著提高9Ni钢的低温韧性水平及工艺稳定性,屈强比降低。随着两相区淬火温度的提高,9Ni钢的抗拉强度基本不变,屈服强度逐渐升高,低温冲击功在640~680℃范围达到最高值,为200 J以上。QLT工艺处理9Ni钢良好的低温韧性水平与层片化的细化马氏体组织及一定数量的稳定逆转变奥氏体直接相关。实验钢在640~680℃的两相区淬火,可获得10%以上含量的逆转变奥氏体,有利于低温韧性的改善。

关键词(KeyWords)： 9Ni钢;临界淬火工艺;低温韧性;逆转变奥氏体

Abstract:

Keywords:

基金项目(Foundation): 国家高科技研究与发展计划(2007AA03Z506)

作者(Author): 侯家平,潘涛,朱莹光,苏航,杨才福,张万山

DOI: 10.13289/j.issn.1009-6264.2014.10.017

参考文献(References)：

• [1]Nakada N,Syarif J,Tsuchiyama T,et al.Improvement of strength-ductility balance by copper addition in 9%Ni steels[J].Materials Science and Engineering A,2004,374:137-144.
• [2]Hoshino M,Saitoh N,Muraoka H,et al.Development of super-9%Ni steel plates with superior low-temperature toughness for LNG storage tanks[J].Nippon Steel Technical Report,2004,90:20-24.
• [3]Takahiro Kubo,Akio Ohmori,Osamu Tanigawa.Properties of high toughness9%Ni Heavy Section Steel Plate and it’s applicability to200000kl LNG storage tanks[J].Kawasaki Steel Technical Report,1999,40:72-79.
• [4]王酒生,刘振宇,谢章龙,等.9Ni钢在线热处理工艺开发[J].太原科技大学学报,2008,29(5):377-399.WANG Jiu-sheng,LIU Zhen-yu,XIE Zhang-long,et al.Development of on-line heat-treatment process of 9Ni steel[J].Journal of Taiyuan University of Science and Technology,2008,29(5):377-379.
• [5]郭魁文,朱健,王秉新.两相区热处理对9Ni钢低温韧性的影响[J].辽宁石油化工大学学报,2010,30(2):26-28.GUO Kui-wen,ZHU Jian,WANG Bing-xin.Influence of two-phase region heat treatment on cryogenic toughness in 9Ni steel[J].Journal of Liaoning Shihua University,2010,30(2):26-28.
• [6]杨跃辉,蔡庆伍,武会宾,等.两相区热处理工艺对9Ni钢性能的影响[J].材料热处理学报,2009,30(3):92-95.YANG Yue-hui,CAI Qing-wu,WU hui-bin,et al.Effect of quenching,lamellarizing and tempering process on properties of 9Ni steel[J].Transactions of Materials and Heat Treatment,2009,30(3):92-95.
• [7]Du W S,Cao R,Yan Y L,et al.Fracture behavior of 9%nickel high-strength steel at various temperatures Part I.Tensile tests[J].Materials Science and Engineering A,2008,486:611-625.
• [8]Fultz B,Kim J I,Kim Y H,et al.The chemical composition of precipitated austenite in9Ni steel[J].Metallurgical transaction A,1986,17(6):967-972.
• [9]雷鸣,郭蕴宜.9%Ni钢中沉淀奥氏体的形成过程及其在深冷下的表现[J].金属学报,1989,25(1):A13-17.LEI Ming,GUO Yun-yi.Forming process and behavior under ultr-acooled condition of reversed austenite in 9Ni steel[J].Acta metallurgica Sinica A,1989,25(1):13-17.
• [10]Kim J.The mechanism of microstructrual change and its consequences in a low carbon Fe-6Ni alloy[D].Berkeley(U.S.),University of California,Berkeley,1979:19-37.
• [11]PAN Tao,ZHU Jing,YANG Cai-fu,et al.Kinetics simulation and experimental observation of fine microstructure of 9%Ni cryogenic steel processed by QLT heat treatment[J].Chinese Science Bulletin,2014,59(15):1765-1772.
• [12]Kim J I,Kim H J,Morris J W.The role of the constituent phases in determining the low temperature toughness of 5.5Ni Cryogenic Steel[J].Metallurgical Transaction A,1984,15(12):2213-2219.

文章评论(Comment)：