查詢結果分析
相關文獻
- 熱均壓對微細鑄造CM-681LC超合金顯微組織及機械性能影響之研究
- CM 247 LC超合金微細晶鑄造特性及時效熱處理研究
- CM 247 LC超合金微細晶鑄造特性及機械性質研究
- 鋯元素對CM 247 LC超合金微細晶鑄造顯微結構及機械性能之影響
- 硼元素對 CM 247 LC 超合金細晶鑄造顯微結構及機械性能之影響
- 熱均壓對微細鑄造MAR-M247超合金細晶拉伸及潛變性能影響之研究
- 微細鑄造及殼式離心鑄造對IN-713LC超合金顯微組織及機械性能影響之研究
- 錸元素對CM 247 LC超合金細晶鑄造顯微結構及機械性能之影響
- 碳含量對細晶鑄造CM-681LC鎳基超合金顯微組織及機械性能影響之研究
- 錸元素對鑄造Mar-M247超合金細晶顯微組織及拉伸性能影響之研究
頁籤選單縮合
| 題 名 | 熱均壓對微細鑄造CM-681LC超合金顯微組織及機械性能影響之研究=A Study on the Effect of Hot Isostatic Pressing on Microstructure and Mechanical Properties of CM-681LC Superalloy via Microcast |
|---|---|
| 作 者 | 薄慧雲; 魏肇男; 廖健鴻; 洪炎輝; 鄭榮瑞; 葛平亞; 張立; 鄭文興; 馬堅勇; | 書刊名 | 鑄造工程學刊 |
| 卷 期 | 33:2=133 2007.06[民96.06] |
| 頁 次 | 頁26-39 |
| 分類號 | 472.2 |
| 關鍵詞 | 熱均壓; 細晶; CM-681LC超合金; 碳化物; 拉伸測試; Hot isostatic pressing; Fine grain; Superalloy; Carbide; Tensile test; |
| 語 文 | 中文(Chinese) |
| 中文摘要 | 本研究旨在探討熱均壓對微細鑄造CM-681LC超合金細晶鑄件顯微組織及機械性能之影響,採用微細鑄造法澆鑄出80μm之細晶試桿,部分試桿進行熱均壓處理。研究結果顯示:無熱均壓之試桿,因金屬液凝固收縮產生微縮孔,造成拉伸強度及伸長率的急遽下降,熱均壓後可消除細晶鑄件之微縮孔,微縮孔面積分率由熱均壓前0.2%減少為熱均壓後之0.06%。此外,CM-681LC超合金晶界上MC碳化物於熱均壓後部分轉變成M23C6碳化物,其形態由長條狀轉變成不連續顆粒狀,顯示熱均壓後碳化物被細化及球化。由於熱均壓後微縮孔減少及碳化物細化,可有效提昇細晶試桿室溫及高溫之抗拉強度2~0%、降伏強度4~0%及伸長率10%以上。破損分析顯示:熱均壓前之細晶試桿,內部微縮孔及晶界上長條狀碳化物是造成破斷之主要因素;熱均壓後之細晶試桿,由於微縮孔大量減少及碳化物之細化,其破壞模式屬標準之沿晶破壞。由本研究結果證實,熱均壓處理可消除微細鑄造細晶鑄件微縮孔及細化碳化物,有效提昇拉伸強度及伸長率,達到細晶鑄件優良的性質。 |
| 英文摘要 | This study investigated how hot isostatic pressing (HIP) affects the microstructure and mechanical propeerties of CM-681LC superalloy. As-cast test bars with grain size of 80μm are prepared using the fine grain process and some of them underwent HIP. The experimental results indicate that the tensile strengths and elongations of the fine grain CM-681LC superalloy before HIP are degraded by micropores that are formed by liquid metal solidification and contraction. In this investigation, the area fraction of micropores is reduced from 0.2% to 0.06% after HIP. MC carbides decompose into M23C6 carbides during HIP and the morphologies of the carbides undergo a scriptlike transition to discontinuous particles. The results demonstrate that HIP refines and spheroidizes the carbides. Elimination of the micropores and refinement of the carbides improve the mechanical strength up to about 9% and the elongation by over 10% for room and high temperature tensile tests. The fracture analyses of the tensile test specimens suggest that the microporosity and the scriptlike carbides at the grain boundaries are the main causes of the fracture of the fine grain test bars before HIP. The fracture mode of the fine grain test bars after HIP in the tensile test is typically intergraularly because of the elimination of the micropores and the refinement of the carbides. As a result of the elimination of the micropores and refinement of the carbides by HIP effectively improves the tensile strength and elongation, the fine grain casting gets good mechanical properties. |
本系統中英文摘要資訊取自各篇刊載內容。