含Nb-Ti低碳微合金钢中纳米碳化物的相间析出行为
李小琳, 女, 1990年生, 博士生
修回日期: 2014-10-27
网络出版日期: 2015-05-01
基金资助
* 国家自然科学基金资助项目51234002
INTERPHASE PRECIPITATION BEHAVIORS OF NANOMETER-SIZED CARBIDES IN A Nb-Ti-BEARING LOW-CARBON MICROALLOYED STEEL
Revised date: 2014-10-27
Online published: 2015-05-01
Supported by
Supported by National Natural Science Foundation of China (No.51234002)
采用热膨胀实验研究了等温温度对Nb-Ti微合金钢组织、性能及析出行为的影响规律, 利用TEM对不同温度等温后试样的析出行为进行观察和分析. 结果表明, 不同温度等温后试样中均可观察到相间析出碳化物, 且降低等温温度可显著细化相间析出碳化物所在面面间距、相间析出碳化物所在面内析出物间距及相间析出碳化物尺寸. 具有层状分布特征的相间析出碳化物所在面呈现弯曲和平直2种形态, 其中平直型相间析出碳化物所在面平行于铁素体的{011}, {012}, {013}和{035}面. 经HRTEM确定相间析出碳化物具有NaCl型晶体结构, 晶格常数为0.434 nm, 且与铁素体基体符合Baker-Nutting (B-N)关系, 经EDS分析确定相间析出碳化物为(Nb, Ti)C. 利用Orowan机制对析出强化量进行估算, 结果表明不同等温温度下析出强化量均大于300 MPa.
李小琳 , 王昭东 . 含Nb-Ti低碳微合金钢中纳米碳化物的相间析出行为[J]. 金属学报, 2015 , 51(4) : 417 -424 . DOI: 10.11900/0412.1961.2014.00582
High strength low alloy steels utilize chemical composition design of low carbon content and are microalloyed with Nb, V and Ti, or other additions, such as Mo and B, etc. The increase of strength is attributed to grain refinement strengthening, solid-solution strengthening, dislocation strengthening and precipitation hardening. Moreover, the precipitation hardening attracts more and more attentions. However, the detailed results on the sheet spacing, inter-particle spacing, crystallography, composition and the nucleation site of the interphase precipitation carbides in Nb-Ti containing steels have not been reported as yet. In this work, the microstructure, mechanical properties and precipitation behaviors in a low carbon Nb-Ti microalloyed steel were investigated using the dilatometer and TEM. The results show that the interphase precipitation can be observed for different isothermal temperatures and the sheet spacing, inter-particle spacing and size of the interphase precipitation carbides are refined by lowing isothermal temperature. The characteristic sheets of interphase precipitation carbides were identified as planar and curved. The planar sheets of interphase precipitation carbides have been analyzed and found to be parallel with {011},{012},{013}and {035} planes of ferrite. Moreover, the interphase precipitation carbides which have been determined to be (Nb, Ti)C have a NaCl-type crystal structure with a lattice parameter of 0.434 nm and obey the Baker-Nutting (B-N) orientation relationship with respect to ferrite matrix. The contribution of the interphase precipitation hardening to the yield strength of the experiment steel has been estimated above 300 MPa, based on the Orowan mechanism.
| [1] | Guo J, Shang C J, Yang S W, Guo H, Wang X M, He X L. Mater Des, 2009; 30: 129 |
| [2] | Manohar P A, Chandra T, Killmore C R. ISIJ Int, 1996; 36: 1486 |
| [3] | Chen J, Chen X W, Tang S, Liu Z Y, Wang G D. Mater Sci Forum, 2013; 749: 243 |
| [4] | Cizek P, Wynne B P, Davies C H J, Muddle B C, Hodgson P D. Metall Mater Trans, 2002; 33A: 1331 |
| [5] | Funakawa Y, Shiozaki T, Tomita K, Yamamoto T, Maeda E. ISIJ Int, 2004; 44: 1945 |
| [6] | Okamoto R, Borgenstam A, ?gren J. Acta Mater, 2010; 58: 4783 |
| [7] | Yen H W, Chen C Y, Wang T Y, Huang C Y, Yang J R. Mater Sci Technol, 2010; 26: 421 |
| [8] | Chen C Y, Yen H W, Kao F H, Li W C, Huang C Y, Yang J R, Wang S H. Mater Sci Eng, 2009; A449: 162 |
| [9] | Yen H W, Huang C Y, Yang J R. Adv Mater Res, 2010; 89: 663 |
| [10] | Yen H W, Huang C Y, Yang J R. Scr Mater, 2009; 61: 616 |
| [11] | Yen H W, Chen P Y, Huang C Y, Yang J R. Acta Mater, 2011; 59: 6264 |
| [12] | Chen M Y, Yen H W, Yang J R. Scr Mater, 2013; 68: 829 |
| [13] | Smith R M, Dunne D P. Mater Forum, 1988; 11: 166 |
| [14] | Honeycombe R W K. Metall Trans, 1976; 7A: 915 |
| [15] | Ricks R A, Howell P R. Acta Metall, 1983; 31: 853 |
| [16] | Bhadeshia H K D H. Prog Mater Sci, 1985; 29: 321 |
| [17] | Jang J H, Lee C H, Heo Y U, Suh D W. Acta Mater, 2012; 60: 208 |
| [18] | Batte A D, Honeycom R W. J Iron Steel Inst, 1973; 211: 284 |
| [19] | Sakuma T, Honeycombe R W K. Met Sci, 1984; 18: 449 |
| [20] | Freeman S, Honeycombe R W K. Met Sci, 1977; 11: 59 |
| [21] | Chen J, Lü M Y, Tang S, Liu Z Y, Wang G D. Acta Metall Sin, 2014; 50: 524 |
| [21] | (陈 俊, 吕梦阳, 唐 帅, 刘振宇, 王国栋. 金属学报, 2014; 50: 524) |
| [22] | Campos S S, Morales E V, Kestenbach H J. Mater Charact, 2004; 52: 379 |
| [23] | Furuhara T, Aaronson H I. Scr Mater, 1988; 22: 1635 |
| [24] | Kocks U F. Acta Metall, 1966; 14: 1629 |
| [25] | Enomoto M. Met Mater Int, 1998; 4: 115 |
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