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金属学报  2017, Vol. 53 Issue (6): 648-656    DOI: 10.11900/0412.1961.2016.00437
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Nb对Ti-Mo微合金钢连续冷却相变规律及组织性能的影响
何仙灵1,杨庚蔚1(),毛新平1,2,余驰斌1,达传李1,甘晓龙1,2
1 武汉科技大学省部共建耐火材料与冶金国家重点实验室 武汉 4300812 武汉钢铁(集团)公司研究院 武汉 430083
Effect of Nb on the Continuous Cooling Transformation Rule and Microstructure, Mechanical Properties of Ti-Mo Bearing Microalloyed Steel
Xianling HE1,Gengwei YANG1(),Xinping MAO1,2,Chibin YU1,Chuanli DA1,Xiaolong GAN1,2
1 State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
2 Research and Development Institute, Wuhan Iron and Steel (Group) Co., Ltd., Wuhan 430083, China
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摘要: 

利用热模拟试验机、SEM、HRTEM及EDS研究了Ti-Mo和Ti-Mo-Nb低碳微合金钢的连续冷却转变规律,探讨了Nb对Ti-Mo微合金钢组织及性能的影响。结果表明:Nb元素能够提高钢的Ac1Ac3温度,降低冷却过程中奥氏体的分解温度,缩小铁素体-珠光体相区,使贝氏体相区向左下方移动。此外,Nb的添加能够细化Ti-Mo-Nb微合金钢中的组织,提高硬度。利用HRTEM对冷速为50 ℃/s的样品进行分析,发现:Ti-Mo和Ti-Mo-Nb微合金钢中均存在少量应变诱导析出的碳化物,分别为(Ti, Mo)C和 (Ti, Nb, Mo)C粒子,呈随机分布。2种析出物均为NaCl型结构,其晶格常数分别为0.432和0.436 nm,平均粒径分别为12.11和8.69 nm。Ti-Mo-Nb微合金钢中析出相体积分数更多,尺寸更小,是其组织细化、硬度提高的主要原因。

关键词 钛微合金钢CCT曲线Nb纳米析出硬度    
Abstract

In recent years, with the fast development of automotive industry, more and more attention has been focused on developing high strength automobile steels with excellent formability. The microalloying elements, such as Nb, Ti, Mo, which can facilitate grain refinement and precipitation hardening, were added into steels to achieve high strength and good formability. The Ti-Mo and Ti-Mo-Nb microalloyed high strength ferritic steel were developed. In this work, the continuous cooling transformation curves (CCT) of Ti-Mo and Ti-Mo-Nb steels were obtained. And the effect of Nb on the microstructure and mechanical properties of Ti-Mo low carbon microalloyed steel was investigated by means of SEM, HRTEM and EDS. The results showed that Nb could raise the Ac1 and Ac3 temperatures, and restrain the ferrite-pearlite and bainite transformation. Moreover, Nb could also refine the microstructure and harden the matrix of steel which attributed to the strain-induced precipitation of nano-sized (Ti, Nb, Mo)C particles identified by HRTEM and EDS. It was also found that the strain-induced precipitation of (Ti, Mo)C was existed in the Ti-Mo steel. And both of (Ti, Mo)C and (Ti, Nb, Mo)C particles were NaCl type structure. The lattice constants/the average particle sizes of (Ti, Mo)C and (Ti, Nb, Mo)C were 0.432 nm and 0.436 nm / 12.11 nm and 8.69 nm, respectively.

Key wordsTi microalloyed steel    CCT curve    Nb    nano-sized precipitation    hardness
收稿日期: 2016-10-05      出版日期: 2017-04-05
基金资助:中国博士后科学基金项目No.2014M562072

引用本文:

何仙灵,杨庚蔚,毛新平,余驰斌,达传李,甘晓龙. Nb对Ti-Mo微合金钢连续冷却相变规律及组织性能的影响[J]. 金属学报, 2017, 53(6): 648-656.
Xianling HE,Gengwei YANG,Xinping MAO,Chibin YU,Chuanli DA,Xiaolong GAN. Effect of Nb on the Continuous Cooling Transformation Rule and Microstructure, Mechanical Properties of Ti-Mo Bearing Microalloyed Steel. Acta Metall Sin, 2017, 53(6): 648-656.

链接本文:

http://www.ams.org.cn/CN/10.11900/0412.1961.2016.00437      或      http://www.ams.org.cn/CN/Y2017/V53/I6/648

Steel C Si Mn Ti Mo Nb Cr N Fe
Ti-Mo 0.06 0.070 1.44 0.097 0.28 - 0.21 0.0035 Bal.
Ti-Nb-Mo 0.06 0.088 1.46 0.100 0.29 0.074 0.20 0.0083 Bal.
表1  微合金钢的化学成分
图1  测定动态连续冷却转变(CCT)曲线示意图
图2  Ti-Mo钢和Ti-Mo-Nb钢的温度-膨胀量曲线
图3  Ti-Mo钢经不同冷速冷却后的SEM像
图4  Ti-Mo-Nb钢经不同冷速冷却后的SEM像
图5  Ti-Mo和Ti-Mo-Nb钢的动态CCT曲线
图6  Ti-Mo和Ti-Mo-Nb钢在不同冷速下冷却后的硬度
图7  Ti-Mo和Ti-Mo-Nb钢中析出相体积分数随温度的变化
图8  冷速为50 ℃/s冷却时Ti-Mo和Ti-Mo-Nb钢中的析出相形貌及EDS谱
图9  Ti-Mo钢与Ti-Mo-Nb钢析出相的HRTEM像和Fourier变换谱
图10  Ti-Mo 和Ti-Mo-Nb钢在冷速为50 ℃/s时的析出物尺寸分布
图11  Ti-Mo和Ti-Mo-Nb钢变形后奥氏体晶界图
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