Effect of Heat Treatment on Microstructures and Properties of RE-Nb Modification Chilled Cast Iron

Li Chenhui; Song Yanpei; Wei Xue; Lu Chao; Lui Bingchun; Han Yuting

doi:10.15980/j.tzzz.2014.06.019

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Effect of Heat Treatment on Microstructures and Properties of RE-Nb Modification Chilled Cast Iron
Vol. 34, Issue 6, Pages: 623-625(2014)
Published： 2014 ，
DOI： 10.15980/j.tzzz.2014.06.019

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[1]李晨辉,宋延沛,魏雪,卢超,刘冰春,韩玉婷.热处理对RE-Nb变质无限冷硬铸铁组织与性能的影响[J].特种铸造及有色合金,2014,34(06):623-625.

Li Chenhui, Song Yanpei, Wei Xue, et al. Effect of Heat Treatment on Microstructures and Properties of RE-Nb Modification Chilled Cast Iron. [J]. Special Casting & Nonferrous Alloys 34(6):623-625(2014)
[1]李晨辉,宋延沛,魏雪,卢超,刘冰春,韩玉婷.热处理对RE-Nb变质无限冷硬铸铁组织与性能的影响[J].特种铸造及有色合金,2014,34(06):623-625. DOI： 10.15980/j.tzzz.2014.06.019.

Li Chenhui, Song Yanpei, Wei Xue, et al. Effect of Heat Treatment on Microstructures and Properties of RE-Nb Modification Chilled Cast Iron. [J]. Special Casting & Nonferrous Alloys 34(6):623-625(2014) DOI： 10.15980/j.tzzz.2014.06.019.

摘要

采用扫描电镜、X射线衍射仪等分析手段

研究了热处理工艺对离心铸造变质无限冷硬铸铁轧辊组织和性能的影响。结果表明

变质无限冷硬铸铁轧辊的铸态组织是贝氏体+碳化物+少量马氏体+极少量残余奥氏体+蠕虫状石墨。经热处理后

变质无限冷硬铸铁轧辊组织中少量的残余奥氏体几乎消失

贝氏体数量明显增多。随着回火温度升高

试样的硬度降低

冲击韧度先升高后下降。250℃回火时

试样具有最优的综合力学性能。

Abstract

Effects of heat treatment on microstructures and properties of modification chilled cast iron roll were investigated by scanning electron microscopy（SEM）

X-ray diffraction（XRD）analysis.The results show that the as-cast microstructure of modification chilled cast iron roller is composed of bainite

carbide

a small amount of martensite

trace retained austenite and vermicular graphite.After heat treatment

retained austenite almost disappears

and bainite content is increased obviously.Along with the increase of tempering temperature

the hardness of the sample prepared is reduced

and impact toughness is increased firstly and then decreased.Desirable comprehensive mechanical properties of the specimen tempered at 250℃can be obtained.