| 引用本文: | 朱建雷,崔慧娟,李锁牢,金莹.α区形变对微合金钢中析出相和强度的影响[J].材料科学与工艺,2022,30(5):44-50.DOI:10.11951/j.issn.1005-0299.20210283. |
| ZHU Jianlei,CUI Huijuan,LI Suolao,JIN Ying.Effect of deformation in α zone on precipitates and yield strength in micro-alloyed steel[J].Materials Science and Technology,2022,30(5):44-50.DOI:10.11951/j.issn.1005-0299.20210283. |
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| 摘要: |
| 采用Gleeble热模拟实验机对含Nb、Mo微合金钢进行了铁素体(α)区形变+等温工艺实验,研究了微合金钢中析出相的变化及其对强度的影响。利用透射电镜对不同工艺所制备试样中析出相的形貌进行观察和分析,纳米级析出相弥散分布于铁素体基体之中；并对析出相的尺寸进行统计分析,结果表明,相较于等温工艺,形变+等温工艺可以明显细化析出相的尺寸,且在600 ℃下获得的析出相尺寸更为细小,平均尺寸为2.77 nm。利用Thermo Calc数据库计算平衡条件下600和700 ℃时(Nb1-xMox)C中的x值和析出相的体积分数,结合实验中统计的析出相尺寸,分析了不完全析出条件下(Nb1-xMox)C析出相对屈服强度的贡献。结果表明,在600 ℃进行形变+等温工艺,尽管析出相的体积分数不高,但因 (Nb1-xMox)C的尺寸更小,其提供的屈服强度增量更高。 |
| 关键词: α区形变 析出相 (Nb1-xMox)C 微观组织 屈服强度 |
| DOI：10.11951/j.issn.1005-0299.20210283 |
| 分类号:TG142.1 |
| 文献标识码:A |
| 基金项目:陕西省教育厅专项科学研究计划项目(21JK0972)；咸阳职业技术学院博士科研启动基金项目(2021BK02);陕西省自然科学基础研究计划项目(2022JQ416). |
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| Effect of deformation in α zone on precipitates and yield strength in micro-alloyed steel |
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ZHU Jianlei1,2, CUI Huijuan1, LI Suolao1, JIN Ying1
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(1. School of Mechanical and Electrical Technology, Xianyang Vocational Technical College, Xi′an 712000, China; 2. School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650031, China)
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| Abstract: |
| Deformation+isothermal processes in α zone were conducted on micro-alloyed steel containing Nb and Mo using Gleeble thermal simulator, and the variation of precipitates in micro-alloyed steel as well as its effect on strength was studied.The morphology of precipitates in the samples prepared by different processes was observed by transmission electron microscope, and nano-sized precipitates were dispersed in the ferrite matrix. The size of precipitates was statistically analyzed.Results show that compared with isothermal process,the deformation + isothermal processes could refine the size of precipitates, and precipitates obtained at 600 ℃ were even smaller, with an average size of 2.77 nm. Thermo-Calc software was adopted to calculate the x value of (Nb1-xMox)C and the volume fraction of precipitates under equilibrium conditions at 600 and 700 ℃.Combined with the precipitate size obtained from the experiment, the contribution of (Nb1-xMox)C precipitates to the yield strength under incomplete precipitation conditions was analyzed. The results indicate that although the volume fraction of precipitates is not high during deformation+isothermal processes at 600 ℃,the yield strength increment is higher due to the smaller size of (Nb1-xMox)C. |
| Key words: α zone deformation precipitation (Nb1-xMox)C microstructure yield strength |
