Improving impact toughness of a high chromium cast iron regarding joint additive of nitrogen and titanium

被引：55
作者：
Ding, Hongsheng [1 ]
Liu, Shiqiu [1 ]
Zhang, Hailong [1 ]
Guo, Jingjie [1 ]
机构：
[1] Harbin Inst Technol, Sch Mat Sci & Engn, Natl Key Lab Precis Hot Proc Met, Harbin 150001, Peoples R China
来源：
MATERIALS & DESIGN | 2016年 / 90卷
关键词：
High chromium cast irons (HCCIs); Nitrogen; Refinement; Microstructure; Impact toughness; TRANSMISSION ELECTRON-MICROSCOPY; MECHANICAL-PROPERTIES; FRACTURE-TOUGHNESS; MICROSTRUCTURE; WEAR; BEHAVIOR; RESISTANCE; TICN; CR; CARBIDES;
D O I：
10.1016/j.matdes.2015.11.055
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this work, the effect of nitrogen on the as-cast microstructure and impact toughness of high chromium cast irons(HCCIs) mainly containing 2.2%C, 25.0%Cr and 0.8%Ti was studied (all compositions are in wt.% in this work). The experimental results showed that with the addition of N(0.028%, 0.075%, 0.2%, respectively), Ti(C, N) precipitates were formed in the high chromium cast irons, and dispersedly distributed in M7C3 carbides and austenite matrix. With the increase of nitrogen content, the microstructure was significantly refined, especially the M7C3 carbides, which was related to the heterogeneous nucleation of M7C3 carbide where Ti(C, N) precipitates act as the heterogeneous nuclei substrates. The Rockwell hardness of the specimen with 0.2% nitrogen increased to 49HRC in comparison to the specimen with 0.028% nitrogen (47HRC). The impact toughness of the specimen reached its peak value of 20.79 J/cm(2) with 0.075% nitrogen, improving almost 80% compared with the specimen with 0.028% nitrogen (11.80 J/cm(2)). (C) 2015 Elsevier Ltd. All rights reserved.
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收藏
页码：958 / 968
页数：11
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