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首页> 外文期刊>Journal of Materials Processing Technology >Cooling rate and carbon content effect on the fraction of secondary phases precipitate in as-cast microstructure of ASTM F75 alloy
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Cooling rate and carbon content effect on the fraction of secondary phases precipitate in as-cast microstructure of ASTM F75 alloy

机译：冷却速率和碳含量对ASTM F75合金铸态组织中第二相沉淀分数的影响

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摘要

Simple test castings were used to study the effect of cooling rate and carbon content in as-cast microstructure of alloy ASTM F75, Co-26 wt.% Cr-5.7 wt.% Mo. Alloys with four C content (0.45, 0.33, 0.36 and 0.25 wt.%) were poured into investment ceramic molds. In order to obtain different cooling rates, the castings were constituted of three axisymmetrical cylinders of different diameters (12,16 and 24 mm). Cooling curves were obtained from each cylinder and the fraction of secondary phases in as-cast microstructure was measured by image analysis. Average cooling rates of 100, 60 and 20℃/min, were obtained in the 12, 16 and 24 mm diameter cylinders respectively, at the first solidification step occurring in the temperature range from 1390 to 1350℃. A significant effect of this cooling rate range on the fraction of secondary phase was not observed. It was observed that the fraction of blocky carbides increased proportionally as the C content increased, whereas the amount of the eutectoid constituent showed a significant increase only in the sample containing 0.45 wt.%, as compared with the samples of other carbon contents. It was also found that the initial solidification undercooling affects the temperature of sigma phase precipitation with which the solidification of the alloy is completed.
机译：使用简单的测试铸件来研究冷却速度和碳含量对合金ASTM F75，Co-26 wt。％Cr-5.7 wt。％Mo的铸态显微组织的影响。四种C含量（0.45、0.33、0.36的合金）分别将0.25重量％和0.25重量％）倒入熔模陶瓷模具中。为了获得不同的冷却速率，铸件由三个不同直径（12、16和24 mm）的轴对称圆柱体组成。从每个气缸获得冷却曲线，并通过图像分析测量铸态显微组织中次生相的比例。在第一个凝固步骤中，在1390至1350℃的温度范围内，分别在直径为12、16和24毫米的圆筒中分别获得100、60和20℃/ min的平均冷却速度。没有观察到该冷却速率范围对第二相的分数的显着影响。观察到，随着C含量的增加，块状碳化物的比例成比例地增加，而与其他碳含量的样品相比，共析成分的含量仅在含0.45wt。％的样品中显示出显着的增加。还发现，初始凝固过冷会影响完成合金凝固的σ相析出温度。

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