快速热处理对低碳钢烘烤硬化性能的影响<sup>*</sup>

doi:10.11901/1005.3093.2013.844

材料研究学报

2014, Vol. 28

Issue (4): 262-268 DOI: 10.11901/1005.3093.2013.844

本期目录 | 过刊浏览

快速热处理对低碳钢烘烤硬化性能的影响^*

邝春福^1,²,张深根¹(

),李俊²,王健²,徐德超³

1. 北京科技大学材料科学与工程学院北京 100083
2. 宝钢集团中央研究院上海 201900
3. 东北大学材料与冶金学院沈阳 110014

Effect of Rapid Heat Treatment on Bake Hardening Behavior of a Low Carbon Steel

Chunfu KUANG^1,²,Shengen ZHANG^1,^**(

),Jun LI²,Jian WANG²,Dechao XU³

1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083
2. Central Research Institute of Baosteel, Shanghai 201900
3. School of Materials and Metallurgy, Northeastern University, Shenyang 110004

引用本文:

邝春福,张深根,李俊,王健,徐德超. 快速热处理对低碳钢烘烤硬化性能的影响^*[J]. 材料研究学报, 2014, 28(4): 262-268.
Chunfu KUANG, Shengen ZHANG, Jun LI, Jian WANG, Dechao XU. Effect of Rapid Heat Treatment on Bake Hardening Behavior of a Low Carbon Steel[J]. Chinese Journal of Materials Research, 2014, 28(4): 262-268.

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摘要:

将低碳钢以200℃/s分别加热至660℃和750℃超快速退火, 将其预应变2%后进行烘烤处理(180℃×20 min), 研究了加热温度、均热时间和冷却速率对低碳钢烘烤硬化性能的影响。结果表明: 提高加热温度可增加碳化物溶解量, 使BH值升高。随着均热时间的延长, 660℃低温退火时BH值明显降低。但是在750℃高温退火时碳化物在超快速加热过程中不能充分溶解, 因此BH值随均热时间的变化比较复杂: 在0-10 s范围内, BH值随着均热时间的延长而增加; 均热时间超过10 s后, BH值则随着均热时间的延长而降低。随着冷却速率的提高, 快速冷却抑制固溶C原子析出, 使烘烤硬化性能提高。

关键词 ：金属材料, 快速热处理, 烘烤硬化, 低碳钢, BH值, 固溶C原子

Abstract：

A low carbon steel was firstly annealed with an ultra-rapid heating rate of 200℃/s at 660℃ and 750℃ respectively, then the steel was pre-strained to 2% and finally suffered a baking hardening treatment at 180℃ for 20 min in order to reveal the synergistic effect of the above two heat treatments of the performance of the low carbon steel in terms of heating temperature, soaking time and cooling rate etc. Results indicated that the bake hardening was enhanced with the increase in annealing temperature for the dissolution of the carbides. The BH value of the low carbon steel annealed at 660℃ decreased significantly with increasing soaking time. But the BH value showed a complex variation with soaking time for the steel annealed at 750℃ because the carbides dissolved incompletely during the ultra-rapid heating process: with an increase in soaking time in the range of 0 to 10 s, the BH value made an apparent increment, and then decreased obviously when the soaking time exceeded 10 s. The bake hardening of the steel is enhanced significantly with increasing cooling rate due to the increment of the solute carbon.

Key words： metallic materials rapid heat treatment bake hardening low carbon steel BH value solute carbon atom

收稿日期: 2013-11-11

基金资助:* 国家科技支撑计划2011BAE13B07资助项目。

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https://www.cjmr.org/CN/10.11901/1005.3093.2013.844 或 https://www.cjmr.org/CN/Y2014/V28/I4/262

表1 轧制工艺参数

图1 BH值的测量方法

图2 试验钢在不同退火状态下的微观组织

图3 加热温度和均热时间对BH值的影响

图4 冷却速率对低碳钢BH值的影响

图5 C原子的面分布状况

图6 不同均热时间试样的SEM像(二次电子像)和碳化物能谱

图7 均热时间对固溶C含量的影响([C]—基体固溶C含量; [C]D—单位时间内固溶C原子溶解数量; [C]S—单位时间内固溶C原子偏聚数量)

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