摘要
研究了分级保温热处理对高铬白口铸铁组织转变、硬度、冲击韧性及耐磨性的影响。结果表明:高铬白口铸铁分级保温处理中,基体中过饱和的碳和合金元素会以二次碳化物的形式析出,残留奥氏体发生马氏体转变。在1150℃×2 h+890℃×5 h分级保温过程中,随着保温时间的延长有大量二次碳化物析出,首先析出颗粒状的(Cr,Fe)23C6,然后基体和(Cr,Fe)23C6发生原位转变生成片状的(Cr,V)2C和长条状的(Cr,Fe)7C3,有效地提高了合金的硬度、冲击韧性及抗磨损能力。
Effects of multi-stage heat treatment on microstructural transformation and mechanical properties such as hardness,impact toughness and wear resistance of high chromium white cast iron were experimentally investigated.The results show that the supersaturated carbon and the alloying elements from the matrix material of the tested iron are precipitated as a form of secondary carbides.The retained austenite to the martensite transformation can also occurre during the heat treatment.It is found that numerous secondary carbides are precipitated with increasing of holding time in the process of the 1150 ℃ × 2 h + 890 ℃ × 5 h heat treatment.The granular( Cr,Fe)23C6firstly precipitates,then there are in situ reaction to the sheet( Cr,V)2C and rod-shaped( Cr,Fe)7C3carbide between the( Cr,Fe)23C6and the matrix material.The mechanical properties of the iron can be effectively improved due to the final secondary carbides.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2014年第7期120-125,共6页
Transactions of Materials and Heat Treatment
基金
江西省教育厅科技项目(GJJ11498)
南昌市科技支撑计划项目(2010-95)
关键词
高铬白口铸铁
热处理
硬度
冲击韧性
耐磨性
二次碳化物
high chromium white cast iron
heat treatment
hardness
impact toughness
wear resistance
secondary carbide
