Nb对Ti-Mo微合金钢连续冷却相变规律及组织性能的影响

doi:10.11900/0412.1961.2016.00437

金属学报

2017, Vol. 53

Issue (6): 648-656 DOI: 10.11900/0412.1961.2016.00437

本期目录 | 过刊浏览

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 MAO^1,²,Chibin YU¹,Chuanli DA¹,Xiaolong GAN^1,²

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

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[J]. Acta Metall Sin, 2017, 53(6): 648-656.

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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A_c1和A_c3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 A_c1 and A_c3 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 words： Ti microalloyed steel CCT curve Nb nano-sized precipitation hardness

收稿日期: 2016-10-05

基金资助:中国博士后科学基金项目No.2014M562072

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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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