通过连续冷却转变方式在全自动相变仪上测定X100管线钢的静态CCT曲线，分析不同冷却速度下X100管线钢显微组织的变化情况。结果表明：X100管线钢是铁素体、贝氏体的复相组织，冷却速度对各相的形态、数量、分布和硬度均有影响；当冷却速度为10~20℃/s，显微组织为针状铁素体+粒状贝氏体，M/A岛弥散分布于其晶界上，且硬度随着冷却速率的增加而增大；X100管线钢的应力-应变曲线为Round-house型，有较高的强度和韧性，-20℃时夏比冲击吸收功达291 J；韧脆转变温度在-80~-100℃。
The static CCT curve was investigated by continuous cooling transformation method on automatic transformation instru-ment,and the microstructure changes of X100 pipeline steel under different cooling rates were analyzed. The results show that the microstructure of X100 pipeline steel is composed of bainite and ferrite. The cooling rates have great effect on the form,pro-portion,distribution of phases and hardness. When the cooling rate is between 10℃/s and 20℃/s,the microstructure consists of acicular ferrite and granular bainite,the M/A constituents are dispersed on the grain boundaries. Furthermore,the hardness increases with the cooling rates increasing. The stress-strain curve is typical Round-house shape and the steel exhibits good com-bination of strength and toughness,the Charpy impact energy reaches 291 J at-20℃,and the ductile-brittle transition tempera-ture is between-80℃and-100℃.
参考文献
| [1] | Okaguchi S;Hamada M;Makino H.Production and develop-ment of X100 and X120 grade line pipe[A].,2005:145-157. |
| [2] | 罗海文,董瀚.高级别管线钢X80～X120的研发与应用[J].中国冶金,2006(04):9-15. |
| [3] | Glover A;Zhou J;Horsley D.Design application and in-stallation of an API5L X100 pipeline[A].Cancun,Mexico,2003 |
| [4] | 曾明,江海涛,胡水平,赵征志.高钢级X100管线钢的组织与性能[J].材料科学与工程学报,2011(03):386-391. |
| [5] | Okaguchi S.Production and development of linepipe steel in grade X100 and X120[A].北京,2005 |
| [6] | Hara T;Terada Y;Shinohara Yasuhiro.Metallurgical design and development of high deformable X100 line pipe steels suitable for strain-based design[A].Canada:Albert,2008:593-598. |
| [7] | 钱海帆.TMCP工艺生产X100管线钢的微观组织及强化机理[J].钢铁研究学报,2011(10):54-58. |
| [8] | Okatsu M;Ishikawa N;Endo S.Development of high strength linepipes with excellent deformability[A].Halkidiki,Greece,2005:63-70. |
| [9] | You, Y.;Shang, C.;Wenjin, N.;Subramanian, S..Investigation on the microstructure and toughness of coarse grained heat affected zone in X-100 multi-phase pipeline steel with high Nb content[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2012:692-701. |
| [10] | 王伟,严伟,胡平,王松涛,单以银,杨柯.抗大变形管线钢的研究进展[J].钢铁研究学报,2011(02):1-6. |
| [11] | 尚成嘉,杨善武,王学敏,侯华兴,于功利,王文仲.低碳贝氏体钢的组织类型及其对性能的影响[J].钢铁,2005(04):57-61. |
| [12] | 段琳娜,刘清友,贾书君,贾成厂,谭峰亮.X100级管线钢的组织和强韧性[J].材料研究学报,2012(04):443-448. |
| [13] | Hwang B;Shin S Y;Lee S et al.Correlation of crack tip open-ing angle for stable crack propagation with charpy and drop weight tear test properties in high toughness API X70 pipe-line steel[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,2006,37:371-380. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%