共查询到18条相似文献,搜索用时 125 毫秒
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叙述高Cr铸铁轧辊使用中常见的因结合层夹渣而造成的轧辊提前失效,并从使用角度分析了造成上述失效的原因,结合制造工艺,提出了质量改进方向。 相似文献
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在分析轧辊的工作条件和失效形式的基础上,对轧辊的选材及热处理工艺进行了探讨,认为40Cr是比较理想的轧辊材料.稀土硼共渗可以明显提高40Cr钢轧辊的使用寿命。 相似文献
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铸轧辊的失效及提高寿命的途径 总被引:3,自引:0,他引:3
总结了铝连铸机上铸轧辊(辊套与辊芯)失效的主要形式和原因,从设计,制造和使用等方面综述了提高铸轧辊寿命的途径,对提高和延长铝连铸机铸轧辊的寿命有一定的参考价值。 相似文献
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对重力浇铸和离心浇铸轧辊进行了比较,指出离心复合轧辊具有组织均匀致密、硬度高且变化小、力学性能好、使用寿命长等优点。详细分析了PQF连轧管机组的轧辊失效原因,提出了预防轧辊失效的方法:加强轧辊检查,合理控制轧制节奏,预热轧辊,控制换辊周期等。 相似文献
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冷轧辊的失效分析及其修复 总被引:6,自引:0,他引:6
介绍了冷轧机轧辊存在划伤、粘辊及剥落 3种失效方式 ,重点分析了轧辊剥落的产生机理 ,并提出轧辊失效的预防措施及冷轧支撑辊失效后的修复方法。实践证明 ,效果良好 相似文献
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对一些重要的轧辊失效事故,例如新辊上机、失效轧辊价格昂贵、对轧机造成损坏、产品质量下降或导致一连串严重的轧机事故,则应该对轧辊的失效进行调查,以确定损坏原因及责任,并对其余轧辊的生产、使用提出建议,失效调查的要点包括: 相似文献
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大型工作辊断裂失效的原因分析 总被引:1,自引:0,他引:1
对材料为 5 5Mn2的大型工作辊断裂的失效原因进行了综合分析。结果表明 ,在热处理时要注意淬火介质及调质过程中产生的残余应力对工作辊的影响。 相似文献
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Amitava Ray M. S. Prasad S. K. Dhua S. K. Sen S. Jha 《Journal of Materials Engineering and Performance》2000,9(4):449-456
Work rolls made of indefinite chill double-poured (ICDP) iron are commonly used in the finishing trains of hot-strip mills
(HSMs). In actual service, spalling, apart from other surface degeneration modes, constitutes a major mechanism of premature
roll failures. Although spalling can be a culmination of roll material quality and/or mill abuse, the microstructure of a
broken roll can often unveil intrinsic inadequacies in roll material quality that possibly accentuate failure. This is particularly
relevant in circumstances when rolls, despite operation under similar mill environment, exhibit variations in roll life.
The paper provides an insight into the microstructural characteristics of spalled ICDP HSM work rolls, which underwent failure
under similar mill operating environment in an integrated steel plant under the Steel Authority of India Limited. Microstructural
features influencing ICDP roll quality, viz. characteristics of graphite, carbides, martensite, etc., have been extensively
studied through optical microscopy, quantitative image analysis (QIA), and electron-probe microanalysis (EPMA). These are
discussed in the context of spalling propensity and roll life. 相似文献
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A. Ray D. Mukherjee B. Sarkar S. Mishra 《Journal of Materials Engineering and Performance》1994,3(5):649-656
Although a precise understanding of roll failure genesis is complex, the microstructure of a broken roll can often unravel
intrinsic deficiencies in material quality responsible for its failure. This is especially relevant in circumstances when,
even under a similar mill-operating environment, the failure involves a particular roll or a specific batch of rolls. This
paper provides a microstructural insight into the cause of premature breakage of a second-intermediate Sendzimir mill drive
roll used at a stainless steel sheet rolling plant under the Steel Authority of India Limited. Microstructural issues influencing
roll quality, such as characteristics of carbides, tempered martensite, retained austenite, etc., have been extensively studied
through optical and scanning electron microscopy, electron-probe microanalysis, image analysis, and x-ray diffractometry.
These are discussed to elucidate specific microstructural inadequacies that accentuated the failure. The study reveals that
even though retained austenite content is low (6.29 vol%) and martensite is non-acicular, the roll breakage is a consequence
of intergranular cracking caused by improper carbide morphology and distribution. 相似文献
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介绍了冷轧支撑辊及工作辊早期失效的主要原因。论证了轧辊自动超声波检测系统的主要功能以及在预防轧辊早期失效所作出的贡献。 相似文献