采用 Thermo-calc 热力学软件以及硬度仪、光学显微镜、扫描电镜、透射电镜等研究了铌钛微合金化铁素体-贝氏体双相管线钢在1050~1220℃再加热过程中奥氏体晶粒的长大行为以及铌的固溶行为对晶粒尺寸的影响.结果表明：在试验温度范围内，试验钢奥氏体晶粒的平均尺寸随再加热温度升高而增大；增加铌含量能有效抑制奥氏体晶粒长大，但当铌的质量分数增至0．080％时，奥氏体晶粒的大小和分布不均匀；再加热过程中钛在奥氏体中主要以沉淀相存在，铌在奥氏体中的固溶量随温度升高呈“S”形增加，未固溶铌含量是影响奥氏体晶粒尺寸的关键因素；试验钢中碳和钛的质量分数分别为0．065％和0．01％时，控制未固溶铌的质量分数高于0．005％即可将奥氏体晶粒尺寸有效控制在100μm 以内.
Growth behavior of austenite grains in niobium and titanium microalloyed ferrite-bainite dual phase pipeline steels during reheating of 1 050 - 1 220 ℃ was studied by Thermo-calc thernodynamic software and hardness testing,optical microscopy,scanning electron microscopy and transmission electron microscopy,as well as the effect of niobium′s dissolved behavior on grain size.The results show that average size of austenite grain increased with the increase of reheating temperature at the range of tested temperature.The growth of austenite grain could be restrained by increasing niobium content,but the size and distributin of austenite grain were unevenly when mass fraction of niobium up to 0.080%.Titanium was mainly in the form of precipitation phase in austenite during reheating,the relationship between dissolved of niobium in austenite and reheating temperature exhibited"S"shape curves,the amount of undissolved niobium was the key factor to influence austenite grain size.When mass fraction of carbon and titanium in tested steel were 0.065% and 0.010%,respectively,the average size of austenite grain could be controlled within 100 μm effectively if the mass fraction of undissolved niobium exceed 0.005%.
参考文献
| [1] | 李鹤林;李霄;吉玲康;陈宏达.油气管道基于应变的设计及抗大变形管线钢的开发与应用[J].焊管,2007(5):5-11. |
| [2] | H. W. Jin;J. Y. Koo;N. V. Bangaru;R. Ayer;D. P. Fairchild;D. S. Hoyt;D. B. Lillig;S. Endo;N. Ishikawa;M. Okatsu;S. Kakihara.High Strain Capacity X60 Linepipe Steels with Superior Strain Aging Resistance[J].International journal of offshore and polar engineering,20083(3):171-175. |
| [3] | 孙毅;张立红;于浩;康永林.控轧控冷工艺条件下X70针状铁素体管线钢铌、钛的析出行为[J].机械工程材料,2006(8):10-12,44. |
| [4] | 钟云龙;刘国权;刘胜新;刘长胜;李光;何岳;钱红宝;李洪德;江玉祥.新型油井管钢33Mn2V的奥氏体晶粒长大规律[J].金属学报,2003(7):699-703. |
| [5] | 张红梅;王振敏;李维娟;王国栋;刘相华.奥氏体晶粒细化的研究[J].机械工程材料,2004(7):4-6. |
| [6] | 钟勇;王忠军;单以银;杨柯.热变形对超纯净管线钢组织的影响[J].材料研究学报,2003(3):304-309. |
| [7] | DUAN Lin-na;WANG Ji-man;LIU Qing-you;SUN Xin-jun;CAO Jian-chun.Austenite Grain Growth Behavior of X80 Pipeline Steel in Heating Process[J].钢铁研究学报(英文版),2010(03):62-66. |
| [8] | 张志波;刘清友;张晓兵;孙新军.加热温度对管线钢奥氏体晶粒尺寸和铌固溶的影响[J].钢铁研究学报,2008(10):36-39. |
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