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研究生(外文):Shih-Guei Lin
論文名稱(外文):CALPHAD-assisted morphology control of manganese sulfide inclusions in free-cutting steels
指導教授(外文):Shih-Kang Lin
外文關鍵詞:Free-cutting steelsMnS inclusionsCALPHADSolidification pathHigh-temperature experiments
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為了能夠精準地控制硫化錳的形貌,本研究使用熱力學計算方法(Calculation of phase diagram, CALPHAD) 搭配高週波感應高溫熔煉實驗。根據TCFE7商用熱力學鐵基資料庫,模擬Fe-Mn-S三元及Fe-C-Si-Mn-S五元合金系統之鋼液的凝固路徑,進一步評估硫含量對硫化錳形貌的影響。此外;根據合金元素添加對“∆T”的改變情形,有系統性的評估合金元素對硫化錳形貌的影響,並將其概分為三類:C, Si, Nb, Cr, V和Mo為共晶反應穩定劑;Al, Cu和O為偏晶反應穩定劑;Ta, Zr, Ni, N, P, W, H, Ar, B和Co為惰性添加劑。其中O為超強的偏晶反應穩定劑,可以顯著的增加球狀的硫化錳的形成。結合高溫實驗與理論熱力學計算,提出控制硫化錳析出形貌、尺寸及分布的材料設計原則,開發更具良好切削性質的快削鋼材並優化其冶煉工藝技術。
It is necessary to develop new free-cutting steels with good machinability in order to meet the ever-increasing demand for machining efficiency in industry. The addition of sulfur (S) can improve the machinability of steel by forming manganese sulfide (MnS) inclusions. These inclusions lower the shear strength of steel such that the cutting resistance is reduced, with MnS being the stress raiser. Since the morphology and the uniformity of the MnS inclusions critically determine the machinability of steels, the reactions involving MnS formation during solidification need to be carefully assessed, especially with regard to whether they are eutectic or monotectic reactions. Globular MnS is formed from the MnS-rich liquid (L2) through a monotectic reaction, which provides a greater benefit for machining. However, the temperature difference (“∆T”) between these two reactions is so close that doping elements may alter the solidification path of the liquid steel, and may result in a eutectic reaction.
In this study, we focus on establishing the relationships between alloying elements and solidified microstructures by utilizing both the calculation of phase diagram (CALPHAD) method and high-temperature experiments with an atmosphere-controlled high-frequency induction furnace. Based on a commercial thermodynamic database, TCFE7, we simulated the solidification path of the pure Fe-Mn-S ternary system and some alternative paths with alloying elements carbon (C) and silicon (Si) to further evaluate the effects of S content on the microstructure of MnS. Moreover, we also systematically evaluated the effects of various alloying elements on the microstructure of MnS based on their effects on changing “∆T”. These alloying elements can be categorized into three groups: C, Si, Nb, Cr, V, and Mo are eutectic-stabilizers, O, Cu and Al are monotectic-stabilizers, and Ta, Zr, Ni, N, P, W, H, Ar, B, and Co are inert dopants, which do not noticeably change the microstructure of MnS. Among these, oxygen (O) is identified as a super-strong monotectic-stabilizer, and the addition of oxygen addition can drastically enhance the monotectic-type MnS, which is desirable for free-cutting steels. The thermodynamic predictions agree closely with the results of high-temperature experiments. With the combined efforts of thermodynamic calculations and high-temperature experiments, the morphology, size, and uniformity of MnS inclusions can be optimized for the development of better free-cutting steels.
口試合格證明書 I
摘要 II
2.1 Phase diagrams and phase equilibria 6
2.1.1 Phase rule 6
2.1.2 Lever rule 8
2.1.3 Stable and metastable 9
2.2 Sulfurized free-cutting steels 11
2.3 The production of sulfurized free-cutting steels 13
2.4 Sulfide inclusions 15
2.5 Morphology and classification of MnS inclusion 19
2.6 The stable and metastable Fe-Mn-S systems 22
3.1 Preparation of materials 26
3.2 Experimental apparatus 27
3.2.1 High-frequency induction furnace 27
3.2.2 Furnace temperature calibration 30
3.3 Analysis 31
3.4 MnS inclusion analysis 34
3.5 CALPHAD method 36
4.1 Temperature data during continuous casting 39
4.2 Morphology of MnS inclusions 42
4.2.1 Classification of MnS inclusions 51
4.2.2 The size and distribution of MnS inclusions 52
4.3 Fe-Mn-S system 54
4.3.1 Calculation of Fe-FeS, Fe-Mn, Mn-MnS binary phase diagrams and FeS-MnS pseudo-binary phase diagram 56
4.3.2 Calculation of Fe-Mn-S ternary phase diagram: Part I - Isoplethal and isothermal sections 59
4.3.3 Calculation of Fe-Mn-S ternary phase diagram: Part II - Liquidus projections 64
4.4 CALPHAD analysis of MnS formation 68
4.4.1 Solidification path for ideal alloy Fe-Mn-S system: Metastable solidification path 70
4.4.2 Effects of C and Si on the Fe-MnS isoplethal section 72
4.4.3 Solidification path for ideal alloy Fe-C-Si-Mn-S system: Stable and metastable solidification paths 73
4.5 Effects of additional elements 77
4.5.1 Effects of oxygen 81
4.5.2 Effects of copper 83
4.5.3 Effects of manganese and sulfur 85
4.5.4 Comparison of TCFE database with PanIron databases 86

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