渗碳20CrMnMoAl钢表面硬贝氏体的制备及其组织特征

张朋; 张福成; 王天生

doi:10.3724/SP.J.1037.2011.00093

金属学报 >

2011 , Vol. 47 >Issue 8: 1038 - 1045

DOI: https://doi.org/10.3724/SP.J.1037.2011.00093

论文

渗碳20CrMnMoAl钢表面硬贝氏体的制备及其组织特征

张朋 ,
张福成 ,
王天生

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燕山大学亚稳材料制备技术与科学国家重点实验室, 秦皇岛 066004

张朋, 男, 1981年生, 博士生

收稿日期: 2011-02-25

修回日期: 2011-04-24

网络出版日期: 2011-08-11

基金资助

国家杰出青年科学基金项目50925522, 国家自然科学基金项目50871094和50821001及河北省杰出青年基金项目E2009001632资助

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PREPARATION AND MICROSTRUCTURE OF HARD BAINITE IN SURFACE LAYER OF CARBURIZED 20CrMnMoAl STEEL

ZHANG Peng ,
ZHANG Fu-Cheng ,
YU Tian-Sheng

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State Key Laboratory of Metastable Materials Science & Technology, Yanshan University, Qinhuangdao 066004

Received date: 2011-02-25

Revised date: 2011-04-24

Online published: 2011-08-11

Supported by

Supported by National Science Foundation for Distinguished Young Scholars of China (No.50925522), National Natural Science Foundation of China (Nos.50871094 and 50821001) and Excellent Youth Foundation of Hebei Province Scientific Committee of China (No.E2009001632)

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摘要

在渗碳20CrMnMoAl钢表面通过热处理获得了硬贝氏体组织, 对其组织结构特征进行了研究. 首先, 利用自行设计的滴注式可控气氛全自动渗碳炉, 在930℃对20CrMnMoAl钢渗碳处理8 h, 使钢表面的C含量达到0.81%(质量分数). 将经过渗碳处理的试样在930℃保温20 min进行奥氏体化处理, 然后淬入温度分别为220, 250和300℃的盐浴中, 并分别保温0.5-50 h后空冷.利用OM, TEM, XRD及显微硬度计对热处理后渗碳层的组织和性能进行分析研究. 结果表明,该钢经过220和250℃保温一定时间后, 试样表层为超细硬贝氏体, 由平均尺寸为70-100 nm的贝氏体层片和分布于片间平均厚度为几纳米到几十纳米的残余奥氏体膜组成,试样表面硬度达到630 HV; 试样心部是低碳板条马氏体; 过渡层是硬贝氏体和低碳马氏体的混合组织.

关键词： 硬贝氏体; 渗碳; 等温淬火; 低碳钢

本文引用格式

张朋 , 张福成 , 王天生 . 渗碳20CrMnMoAl钢表面硬贝氏体的制备及其组织特征[J]. 金属学报, 2011 , 47(8) : 1038 -1045 . DOI: 10.3724/SP.J.1037.2011.00093

Abstract

A new technology was developed based on carburization and succedent low–temperature austempering to produce hard bainitic microstructure in the surface layer of low–carbon steel 20CrMnMoAl. The microstructure and property of the hard bainite were investigated. The samples were carburized in a gas carburizing furnace at 930 ℃ for 8 h. The carbon content in the surface layer increased to 0.81%(mass fraction) after carburization. The carbonized samples were heated at 930℃ for austenitization and then isothermally quenched at different temperatures in salt bath. The microstructures were investigated by OM, TEM and XRD, and the hardness was tested by HV–sclerometer. The results show that for the samples which were isothermally quenched at 220 and 250℃, ultrafine hard bainite was obtained in the surface layer with a hardness of 630 HV. The plate of ultrafine bainitic ferrite was as thin as 70 nm and film of retained austenite had a thickness of several nanometers. Low carbon lath martensite was obtained in the center and mixstructures of the ultrafine bainite and low carbon martensite in the transition layer.

Key words： hard bainite; carbonization; austempering; low carbon steel

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