查詢結果分析
來源資料
頁籤選單縮合
題名 | 直接鑄造變韌鐵系球墨鑄鐵之研究=Study on As-Cast Nodular Cast Iron with Bainitic Matrix |
---|---|
作者 | 洪學舜; 金重勳; 陳興時; | 書刊名 | 中華技術學院學報 |
卷期 | 29 2003.12[民92.12] |
頁次 | 頁119-139 |
分類號 | 472.21 |
關鍵詞 | 變韌鐵基地; 球墨鑄鐵; 直接鑄造; 兩段冷卻過程; Bainitic matrix; Nodular cast iron; Direct casting; Two-stage-cooling process; |
語文 | 中文(Chinese) |
中文摘要 | 本研究設計直種利用二段冷卻速率控制法,進行直接鑄造變韌鐵基地之球墨鑄鐵的可行性研究。在添加Ni, Mo, Cu三種主要合金元素,不同的合金組成情況下配合冷卻速率,是討所得變韌鐵基地球墨鑄鐵性質之差異,及合金元素間Cu取代Ni的問題。 實驗結果顯示:(1)本研究成功地以直接鑄造、並控制冷卻速率之法,得到高於90%的變韌鐵基地的球墨鑄鐵,其成份範圍為C:3.47-.3.62wt%;Si:2.3-2.40wt%;Ni:0.0-3.1wt%;Mo:0.16-0.35wt%;Cu:0-0.84wt%,其抗拉強度:100∼115kgf/mm2,降伏強度:90∼100/mm2,延伸率1.5∼3.0%。(2)石墨周圍旁生成下變韌鐵、遠離石墨區域生成上變韌鐵,碳的作用的為其主要因素之一。(3)Cu可取代Ni,添加1%Cu相當於添加2%Ni所致之S曲線右移變韌鐵的變態效果。(4)添加合金元素固然有助於變韌鐵的變態生成右移,但要適當地控制熱平衡點溫度及瞬間切線斜率,才能得到理想的變韌鐵基地。 |
英文摘要 | The purpose of this study was to explore the possibility of obtaining as-cast bainitic nodular cast iron by a designed of two-stage-cooling after castings being removed from the mold. In order to enhance bainitic transformation, Ni-Mo combinations with varying amount were added, and the feasibility of replacing Ni by cheaper Cu was also persuaded. Optical and electron metallography, X-ray diffactometry, and mechanical testings were applied to study the cast matrix with nodularity better than 80%. From the experimental results, conclusions can be drawn that, (1)nodular cast irons with more than 90% bainitic matrix are obtainable by the two-stage-cooling process with C: 3.47~2051wt%m Si: 2.30~2.40wt%, Ni: 0~3.10wt%, Mo: 0.16~0.35wt%, Cu: 0~0.84wt%, having tensile strengths 100~115 kgf/mm2, yield strengths 90~100kgf/mm2, and elongation 1.5~3.0%; (2)lower bainite was found to appear nearby the graphite, while upper bainite away from it, the difference in carbon distribution is tought to be one of the main reasons; (3)cu was found to be approximately twice as effective as Ni in the enhancement of bainite formation; (4)although alloy addition is important, it was found that the way of controlling cooling processes is even more vital in obtaining bainitic matrix. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。