真空電弧熔煉之(Ni基)低熱膨脹材料製程參數研究

The Study of Vacuum Electric Arc Smelting (Ni base) Low Thermal Expansion Material

平竹清(Chu-Ching Ping)

指導教授 ： 翁芳柏

元智大學/工程學院/機械工程學系/碩士(2012年)

https://doi.org/10.6838/YZU.2012.00023

摘要

本研究探討一些製程參數，即化學成份對機械性質和熱膨脹係數之影響，並將低熱膨脹材料傳統熔煉鑄造技術變更為使用非消耗性鎢棒電及真空電弧熔煉爐達成低熱膨脹材料之製作。研究結果指出，晶粒會隨著C含量的增加由大變小，但會受鈷的影響，當添加到18%時，會出現相反情況。Sb、B影響不大。在硬度方面會受到晶粒影響，隨著C含量的增加而增加，C、Co含量皆會影響晶粒的尺寸。
本研究使用不同的C、Si含量(1.5~2.5%)、Co含量(12~18%)及添加其它低價位元素Sb、B含量(0.5~1.5%)組合，研究中發現各爐次α值皆於常溫至200℃時，會呈現出急劇上昇後漸趨於一定值(12.8~15.0) x10-6/℃，並且可以由結果得知化學成份對α值的影響，Sb、B效果不佳。

關鍵字

α值 ； 晶粒

並列摘要

In this study,a number of process parameters. such chemical composition of the mechanical properties,the thermal expansion coefficient of the impact, conventional melting and casting low thermal expansion materials technology use the power of non-consumable tungsten rods and vacuum,arc melting furnace to reach production of low thermal expansion materials.The study concluded that,the increasing of C content of grain from big to small will be affected by cobalt the impact,When content added to 18%, the opposite situation occurs.Sb and B are little effect. The grain in terms of hardness will be affected, With the increase in C content in increases, C and Co content will affect the grain size.
The study used a different C and Si content (1.5 ~2.5%), Co content (12 ~ 18%), And add other low-cost elements Sb and B content (0.5 ~ 1.5%) combination .The study found that the furnace rise at room temperature to 200℃,after showing a sharp rise,the α value will gradually tend to a certain value(12.8~15.0)x10-6/℃, by results know the chemical composition affect the α value,Sb and B are poorly.

並列關鍵字

α value ； Grain

參考文獻

1. Y.Takuchi,M.Sakamoto and T.Sata,“Improvement in the working Accracy of NC Lathe by Compensating for Thermal Expansion”,CIRP Vol.4,No.1,1982.

14. M.Hatate,T.Shiota,H.Sumimoto,K.Nakamura,“Influences of Ni and Si on Thermal Expansion Characteristics and Mechanical Properties of Low Thermal Expansion Austenitic Cast Iron”,4th AFC Proceedings, pp.145-153, 1996.

18. ASM Metals Handbook,9th Ed.V01.3,pp.729,1989.

19. C.F.Walton and T.J.Opar,Editors,Iron Castings Handbooks, Iron Castings Society,Inc.,pp.136-137, 1981.

20. C.R.Loper,Jr. and R.W.Heine,“Graphite Formation During Solidification of Cast Iron”,AFS Transactions, Vol.69, pp.583-600,1961.