Fracture Analysis of High Cr Casting Iron Roller

Liu Yuqing; Wang Kaikun; Hu Shuiping

doi:10.15980/j.tzzz.2013.10.026

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Fracture Analysis of High Cr Casting Iron Roller
Vol. 33, Issue 10, Pages: 957-959(2013)
Published： 2013 ，
DOI： 10.15980/j.tzzz.2013.10.026

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[1]刘玉庆,王开坤,胡水平.高铬铸铁轧辊断裂原因分析[J].特种铸造及有色合金,2013,33(10):957-959.

Liu Yuqing, Wang Kaikun, Hu Shuiping. Fracture Analysis of High Cr Casting Iron Roller. [J]. Special Casting & Nonferrous Alloys 33(10):957-959(2013)
[1]刘玉庆,王开坤,胡水平.高铬铸铁轧辊断裂原因分析[J].特种铸造及有色合金,2013,33(10):957-959. DOI： 10.15980/j.tzzz.2013.10.026.

Liu Yuqing, Wang Kaikun, Hu Shuiping. Fracture Analysis of High Cr Casting Iron Roller. [J]. Special Casting & Nonferrous Alloys 33(10):957-959(2013) DOI： 10.15980/j.tzzz.2013.10.026.

摘要

针对某公司高铬铸铁轧辊断裂事故

通过外观检测、硬度测量、SEM断口扫描、能谱分析和金相组织观察

研究了轧辊断裂的原因。断口宏观观察到裂纹源区、裂纹扩展区和瞬断区;SEM断口扫描发现轧辊断裂为典型疲劳断裂

断裂方式为穿晶断裂;能谱分析显示大量析出的碳化物为M7C3、M23C6、Mo2C等

组织中类球状黑色物质是由石墨和少量的氧化物夹杂组成;金相组织中共晶碳化物沿晶界呈网状分布

这有可能是造成轧辊疲劳断裂的原因。

Abstract

Aimed at crack accident of high Cr cast iron roller from a company

through analyzing the appearance

the fracture microstructure with the help of SEM（scanning electron microscope）

the hardness measurememt

the energy spectrum and the microstructure

origination of the crack in high Cr cast iron was approached.Macro-fracture is characterized by crack source area

propagation area and instantaneous fault area.SEM analysis shows that the crack of the roller is characterized by fatigue fracture with transgranular crack.The energy spectrum reveal that the carbide is composed of M7C3、M23C6、Mo2C and so on

and spherical black phase consists of graphite and some oxide inclusion.The eutectic carbide with net-like shape is distributed along the grain boundary

which might be responsible for the crack.