共查询到19条相似文献,搜索用时 62 毫秒
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分析了高速钢轧辊的技术发展趋势及高硼低合金高速钢复合铸造工艺试验、技术路线和复合轧辊开发思路,设计了高硼低合金高速钢复合轧辊材质开发的实验方法。 相似文献
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分析了高速钢轧辊的技术发展趋势及高硼低合金高速钢复合铸造工艺试验、技术路线和复合轧辊开发思路,设计了高硼低合金高速钢复合轧辊材质开发的实验方法。 相似文献
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在测试了高硼高速钢轧辊材料临界点和等温转变曲线(TTT)的基础上,借助金相显微镜、扫描电镜、X衍射分析、拉伸试验、冲击试验和硬度试验等手段,研究了淬火处理对高硼高速钢轧辊材料组织与性能的影响.结果表明,高硼高速钢轧辊材料具有很好的淬透性,淬火后易获得高硬度的马氏体组织,且碳硼化合物呈孤立分布.淬火温度超过1050℃后,残留奥氏体增多,硬度反而下降.随着淬火温度升高,高硼高速钢的抗拉强度和冲击韧性提高,超过1050℃,抗拉强度的变化不明显.高硼高速钢在1050℃左右淬火,具有优良的综合性能. 相似文献
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采用横流CO2激光器不同正离焦量对高速钢轧辊试样进行激光相变硬化处理。用金相显微镜、扫描电子显微镜、能谱仪及显微硬度计等对试样组织和硬度进行分析。结果表明,激光热处理后试样硬化区粗大碳化物大量溶解且分布均匀,在相变硬化区边界越靠近热影响区,形成的二次碳化物越粗大密集。激光的功率和扫描速度不变,离焦量为0 mm时,表层出现凸起的微熔区,发生软化现象。离焦量为+10 mm时,亚表层硬度提高最大,最高硬度峰值847 HV,是基体的2~3倍。离焦量为+20 mm时,试样表面形成大量魏氏组织。随正离焦量增加,试样相变硬化的层深减小。 相似文献
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针对高速钢轧辊剥落试样,通过SEM对试样表面裂纹、内部裂纹和断口形貌进行了观察,同时对样品进行了EDS分析及硬度测试,研究了高速钢轧辊组织中碳化物种类、形态及分布,分析了影响疲劳裂纹形成、扩展因素,以及硬度和耐磨性变化的影响因素。结果表明:高速钢轧辊表面产生热疲劳裂纹的主要原因是由于轧辊受到剧烈的冷热温度交替变化,在辊表面产生严重热应变,出现热疲劳裂纹,扩展后造成剥落。裂纹萌生、扩展路径和方式与热疲劳或接触疲劳应力有关,减少轧辊中夹杂物的数量,细化夹杂物状态,改善轧辊组织中碳化物的形态和分布,有利于减轻热疲劳裂纹的萌生和扩展。 相似文献
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High speed steel (HSS) rolls can replace traditional rolls such as alloyed cast iron rolls and powder metallurgical (PM) hard alloy rolls. The main reasons for the replacement are that the wear resistance of low-cost alloyed cast iron rolls is poor and the cost of high-quality PM hard alloy rolls is very high. By means of centrifugal casting, HSS rolls having excellent wear resistance have been manufactured. The hardness of the HSS roll is 65~ 67 HRC, the range of variation is smaller than 2 HRC and its impact toughness is 15 J/cm2. The wear rate of HSS rolls used in the pre-finishing stands of high-speed hot wire-rod rolling mill reaches 2.5 × 10-4 mm per ton steel. Furthermore, the manufacturing cost of HSS rolls is significantly lower than that of PM hard alloy rolls; it is only 30 percent of that of PM hard alloy rolls. 相似文献
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Core filling process of cast high speed steel roll was simulated. Ductile iron was used as core material. The influences of filling parameters, such as core filling time and core filling temperature, on the filling process were investigated. Based on the simulated results, optimal core filling parameters were determined. The predicted temperature fields show that the temperature at the roll shoulder is the lowest during the core filling process and usually causes binding defects there. Method for solving this problem was presented. 相似文献
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