循环热处理对Ti-V微合金钢组织和力学性能的影响

doi:10.11901/1005.3093.2014.051

材料研究学报

2015, Vol. 29

Issue (3): 227-234 DOI: 10.11901/1005.3093.2014.051

本期目录 | 过刊浏览

循环热处理对Ti-V微合金钢组织和力学性能的影响

吕政¹,任学平¹(

),李志宏²,计霞¹,卢子明¹

1. 北京科技大学材料科学与工程学院北京 100083
2. 四川工程职业技术学院德阳 618000

Effect of Cyclic Heat Treatment on Microstructure and Mechanical Properties of Ti-V Microalloyed Steel

Zheng LV¹,Xueping REN^1,^*(

),Zhihong LI²,Xia JI¹,Ziming LU¹

1. School of Materials Science and Engineering, University of Science and Technology Beijing,
Beijing 100083, China
2. Sichuan Engineering Technical College, Deyang 618000, China

引用本文:

吕政,任学平,李志宏,计霞,卢子明. 循环热处理对Ti-V微合金钢组织和力学性能的影响[J]. 材料研究学报, 2015, 29(3): 227-234.
Zheng LV, Xueping REN, Zhihong LI, Xia JI, Ziming LU. Effect of Cyclic Heat Treatment on Microstructure and Mechanical Properties of Ti-V Microalloyed Steel[J]. Chinese Journal of Materials Research, 2015, 29(3): 227-234.

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摘要:

研究了循环热处理对Ti-V微合金钢组织和力学性能的影响。根据显微组织观察结果对各个循环次数的试验钢晶粒尺寸进行统计和计算, 并结合SEM二次电子像揭示了试验钢在循环热处理过程中的组织演变规律, 进而解释了晶粒细化机制; 对试验钢进行TEM实验, 观察了沉淀相粒子的尺寸、成分随循环次数的变化规律。并对不同循环次数下的试验钢进行了室温抗拉强度和冲击韧性实验。结果表明, Ti-V微合金钢的平均晶粒尺寸随着循环次数的增加持续减小(至第7次循环); 受复杂碳化物平均尺寸的影响, 抗拉强度R_m随着循环次数的增加逐渐降低(自第1次循环开始); 而冲击吸收功A_KU则因平均晶粒尺寸和先共析铁素体比例的共同影响, 随循环次数的增加先升高后降低, 并在第3次循环时达到最大。

关键词 ：金属材料, 循环热处理, Ti-V微合金钢, 晶粒细化, 复杂碳化物, 力学性能

Abstract：

Effect of cyclic heat treatment on microstructure and mechanical properties of a Ti-V microalloyed steel was investigated. Therefore, the metallographic microstructure of the steels after heat treatment for each cycle was succesively examined and the relevant grain size was statistically determined; the cyclically heat-treated steels were also examined by means of SEM and TEM in order to reveal the microstructural evolution and the variations of average size and composition of precipitates in the steels with the increasing cycle number; while their tensile strength and toughness were measured. The results show that with the increasing cycle number, the average grain size of the steels decreases continuously. For mechanical properties, R_m has the same regularity due to the increase of mean size of the complex carbide with cycle numbers, while the A_KU initially increases and thereafter decreases as a result of the joint influence of the average grain size and the proportion of proeutectoid ferrite.

Key words： metallic materials cyclic heat treatment Ti-V microalloyed steel grain refinement complex carbides mechanical properties

收稿日期: 2014-01-23

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表1 试验用Ti-V微合金钢主要化学成分(质量分数, %)

图1 循环热处理工艺路线

图2 固溶处理和固溶处理+正火试样的晶粒形貌

图3 不同循环次数试样下的晶粒形貌

图4 平均晶粒尺寸随着循环次数的变化趋势

图5 不同循环次数连续淬火试样的SEM二次电子像

表2 试验钢在不同循环次数下的晶粒尺寸相对差(RD值)

图6 只经过固溶处理和1次循环后试验钢的沉淀相形貌和EDS能谱分析

图7 复杂碳化物平均尺寸及试验钢Rm随着循环次数的变化趋势

图8 试验钢1次循环和7次循环热处理后的位错组态

图9 AKU随着循环次数增加的变化趋势

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