超级贝氏体钢的热处理.pdf

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超级贝氏体钢的热处理
H. T. Chang, H. W. Yen, W.T.Lin, C Y. Huang,J.R. Yang
(1. Department of Materials Science and Engineering, National Taiwan University, Taipei, Taiwan China;
2. Iron and Steel R&D Department, China Steel Corporation, Kaohsiung, Taiwan China)
摘要:研究了分别含有0.0005%(质量分数)和0.0024%(质量分数)硼的两种试验用高硅高碳钢以获
得超级贝氏体组织。奥氏体化后,试样分别在3种不同的等温温度(150℃、200℃和300℃)保温
不同时间。采用带有显微硬度测定的光学显徽镋和透射电镜观察试样的微观组织。结果表明,
200℃等温转变10天后,两种钢均获得了高体积分数的含有纳米级贝氏体铁素体亚单元的束状组
织,具有高达675HV1的超高显微硬度。添加0.0024%(质量分数)瑚能促进200℃等温处理初期
的贝氏体相变,但对缩短相变的完成时间没有明显的影响。在150℃和300℃等温不能得到大量
的贝氏体组织。
关键词:贝氏体;硼;热处理;相变;納米级组织;TEM
中图分类号:TG161
文献标识码:A
文章编号:1008-1690(2015)06-0044-07
Heat Treatment of Superbainitic Steels
H. T. Chang, H. W. Yen, W.T. Lin', C. Y. Huang, J. R. Yang
1. Department of Materials Science and Engineering, National Taiwan University, Taipei, Taiwan China
2. Iron and Steel R&D Department, China Steel Corporation, Kaohsiung, Taiwan China)
Abstract Two experimental high silicon high carbon steels with 5 x 10" and 24 x10"of boron separately) have
been investigated for the development of superbainite structure. After austenitisation, the specimens were held
respectively at three different isothermal transformation tempratures(150, 200, and 300 C) for a variety of time
intervals. The microstructures were examined via optical metallography( with microhardness measurement ) ar
transmission electron microscopy. It was found that after isothermal transformation at 200 C for 10 days, both
steels produced a high volume fraction of sheaf structures with nanometre scaled bainitic ferrite subunits, which
contributed to an ultrahigh microhardness, up to 675 HV1. It was also found that adding 24 x 10"of boron
accelerated the bainitic transformation in the early stage of isothermal transformation at 200C, but did not have a
significant effect on reducing the finish transormation time. Both isothermal temperature of 150 and 300C could
nol lead to the development of high amount of ba
Key words: bainite; boron; heat trealment; phase transformation; nanostructure; TEM
0前言
强度合金钢值得予以广泛的关注。众所周知,在低
碳低合金高强度钢中添加0.002%B(质量分数)能
超级贝氏体钢,由于其具有超高的强度和良好阻止在奥氏体晶界形核的仿晶界型铁素体的转变,
的韧性,作为装甲材料已引起了广泛的关注。通过但对贝氏体相变的速率几乎没有影响。虽然低温贝
设计高硅高碳超级贝氏体钢可以获得超高的强度和氏体的概念得到了发展,但是添加硼对这类钢显微
良好的韧性,因为与普通钢相比,高硅高碳超级贝氏组织特性的影响还没有文献报道过。本文目的是通
体钢可以在更低的温度下发生贝氏体相变,从而获过对两种硼含量分別为0.0005%(质量分数)和
得非常细小的贝氏体板条及板条间弥散分布的奥氏0.0024%(质量分数)的高硅高碳钢的研究来探索
体组织。采用贝氏体相变理论来设计这种新型超高硼的添加对其显微组织的影响。
收稿日期:2015-06-02
本文由《 Inlernational Heat Treatment and Surface Engineerin》编辑部提供,由本刊编委会副主编、上海交通大学
顾剑锋教授编译。
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《热处理》2015年第30卷第6期