1) levitation of the graphite spheres
石墨球漂浮
2) graphite floating
石墨漂浮
1.
It has been discovered that there are slags,graphite floating,coarse pearlites and the thickness of white microstructure affects the mechanical .
结果表明:生产工艺不合理造成了辊筒显微组织和机械性能未达到使用要求,发现夹渣、石墨漂浮、较粗大的层片状珠光体组织存在,材料白口层深度超标影响辊筒的机械性能,焊接修补工艺不合理亦会产生较大的焊接应力,增大了辊筒开裂倾向。
2.
Mechanism of causing graphite floating was studied,and considered that graphite floating depends ibyts nature on the size of graphite ball,and the floating graphite is only free growing one and Conception of critical size to graphite floating was presented and the most effective method to solve graphite floating was given of controlling carbon equivalent and quickly cooling.
对石墨漂浮的形成机理进行了探讨 ,认为石墨漂浮就其本质来说是取决于石墨球的大小 ,漂浮的石墨只能是自由生长的石墨和共晶奥氏体圈形成前的共晶石墨。
3) Graphite floatation
石墨漂浮
1.
The relation between uneven nodular graphite in size on blast - furnace rapid metallograph and graphite floatation was studied by observing metallograph.
采用金相观察法研究了球墨铸铁炉前快速金相球墨大小不均与石墨漂浮的关系。
2.
Based on some simulation figures of chemical composition and technology parameters on graphite floatation in ductile iron, the effects of influence factors and reasons for graphite floatation were discussed.
通过化学成分、工艺参数对石墨漂浮缺陷的仿真图形分析,论述了球铁生产中各因素对石墨漂浮的影响作用及原因,这对消除石墨漂浮和提高球铁铸件质量具有积极作用。
3.
The effect of graphite floatation on mechanical property of nodular graphite cast iron was studied.
研究了石墨漂浮对球铁机械性能的影响规律。
4) kish
[英][kiʃ] [美][kɪʃ]
漂浮石墨;凝壳;浮渣
补充资料：铸铁石墨漂浮
铸铁石墨漂浮
carbon flolation of cast iron
zhutie sh一moP一aofu铸铁石墨漂浮(carbon flotation of Castiron)熔解于铁水中的过饱和碳，随着铁水温度的下降，碳以石墨形态析出于铸件表面，是球墨铸铁、蠕墨铸铁等高碳当量铸铁易发生的缺陷。常出现在铸件厚壁处上表面、砂芯的下表面或铸件最后凝固处，如冒口、冒口颈边缘。它呈密集的黑斑(乌黑发亮)，是大量球状、开花状、枝晶状石墨的聚集。这也是一种密度偏析现象，宏观断口呈连续均匀分布，颜色均匀的一层黑色斑，显微镜低倍(20~40倍)下观察呈明显聚集石墨;100倍下观察，石墨密集成串或连接在一起。该区域含碳量高，镁、稀土、硫也偏高，硬度、抗拉强度、冲击韧度降低。 产生石墨漂浮的根本原因是碳当量过高。厚壁铸件凝固缓慢为石墨上浮提供了时间条件，加剧了石墨漂浮。稀土使共晶点左移，稀土残留量高于0.06%时，石墨漂浮显著增加。镁使共晶点右移，提高残留镁量，减轻石墨漂浮。高温浇注延长了铁液在型内保持液态的时间，增加了石墨漂浮。炉料原始石墨尺寸大、数量多，未熔石墨微粒促进液态下石墨形核析出和石墨漂浮。纯净炉料过冷度大，则不利于形核析出石墨，漂浮较少。主要防止措施是应根据铸件壁厚控制碳当量;小件壁厚不大于30mm时，出现石墨漂浮的临界碳当量为4.7写一4.9%;中件壁厚30一10omm时，出现石墨漂浮的临界碳当量为4.5%一4.6%;大件壁厚大于10omm时出现石墨漂浮的临界碳当量为4.4%~4.5%。尤其要控制碳低于4.。%;适当使用废钢、含硅较低的生铁与回炉料搭配使用;控制残留稀土量不可过高;控制浇注温度;大断面铸件可适量添加铝或局部放置冷铁也可防止石墨漂浮(见铸铁碳当量、球墨铸铁)。
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参考词条