含Nb-Ti低碳微合金钢中纳米碳化物的相间析出行为

doi:10.11900/0412.1961.2014.00582

金属学报

2015, Vol. 51

Issue (4): 417-424 DOI: 10.11900/0412.1961.2014.00582

本期目录 | 过刊浏览

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(

), 王昭东

东北大学轧制技术及连轧自动化国家重点实验室, 沈阳 110819

INTERPHASE PRECIPITATION BEHAVIORS OF NANOMETER-SIZED CARBIDES IN A Nb-Ti-BEARING LOW-CARBON MICROALLOYED STEEL

LI Xiaolin(

), WANG Zhaodong

State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819

引用本文:

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.
Xiaolin LI, Zhaodong WANG. INTERPHASE PRECIPITATION BEHAVIORS OF NANOMETER-SIZED CARBIDES IN A Nb-Ti-BEARING LOW-CARBON MICROALLOYED STEEL[J]. Acta Metall Sin, 2015, 51(4): 417-424.

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摘要:

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.

关键词 ： Nb-Ti微合金钢, 相间析出, Vickers硬度, 高分辨透射电子显微术, 取向关系, 错配度

Abstract：

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.

Key words： Nb-Ti-bearing microalloyed steel interphase precipitation Vickers hardness HRTEM orientation relationship lattice misfit

ZTFLH:

TG113

基金资助:* 国家自然科学基金资助项目51234002

作者简介: null

李小琳, 女, 1990年生, 博士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2014.00582 或 https://www.ams.org.cn/CN/Y2015/V51/I4/417

图1 热处理工艺流程图

图2 不同温度等温后试样的热膨胀曲线

图3 不同温度等温后试样的OM像

图4 相间析出碳化物的TEM观察示意图

图5 不同温度等温后相间析出碳化物的TEM像

图6 630和600 ℃等温后试样中的相间析出碳化物的TEM像和SAED谱

图7 660和600 ℃等温后试样中的相间析出碳化物的HRTEM像、Fourier变换衍射谱和EDS

图8 不同温度等温后试样的Vickers硬度

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