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題 名 | S45C碳鋼銲件銲道之顯微組織及拉伸性質之研究=Investigation of the Microstructure and Tensile Property of the Weld for the S45C Carbon Steel Welded Parts |
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作 者 | 郭金國; 張晉昌; 洪翊軒; 康硯田; 高振洋; | 書刊名 | 鑄造工程學刊 |
卷 期 | 36:4=147 2010.12[民99.12] |
頁 次 | 頁17-25 |
分類號 | 472.14 |
關鍵詞 | S45C碳鋼; 銲接; 銲道機械性質; Carbon steel; Welding; Weld mechanical property; |
語 文 | 中文(Chinese) |
中文摘要 | S45C中碳鋼相當於國外的SAE 1050及JIS S50C規格的機械構造用材料,應用領域廣泛出現於構造及工具用途,例如曲柄軸、輕軌條及汽缸等機具。此次實驗利用S45C碳鋼的V型槽作為母材(Base Metal),配合選用三種碳鋼銲條(以A、B、C標示)及一種不銹鋼銲條(以D標示)來進行銲接研究。銲接後再針對不同銲條所對接(Joint)之全銲道區域,除了觀察金相組織以外,再依照美國材料學會(ASTM E8M)公制規範製作拉伸試棒進行銲後的拉伸試驗,再藉由SEM破斷面觀察及EDS成份分析,以探討銲道部位機械性質和微觀結構變化情形。實驗結果顯示:1.銲條A、B、C的成份組成為中碳鋼,銲道根部至銲道融池區由波來體組織變化為變韌體組織;降伏強度(YS)約360MPa、抗拉強度(UTS)約460MPa;拉伸破斷面經由SEM觀察,屬延性破壞。2.銲條D的組成除了Fe、C外,具一定比Cr、Ni含量,銲接後銲道切面光亮,其性質接近不銹鋼特性,其組織為沃斯田體•肥粒體系不銹鋼(Austenitic-ferritic Stainless steel)亦稱為雙相不銹鋼(Two Phase Stainless Steel);降伏強度(YS)、抗拉強度(UTS)也分別高出A、B、C銲條約35%、60%;拉伸破斷而亦屬延性破壞,但孔洞較上述三種銲條細緻。 |
英文摘要 | The characteristic of S45C carbon steel is similar to SAE1050 and JIS S50C. It often applies for construction and tools. The purpose of this study is to investigate the dissimilar joint property of S45C carbon steel with the method of multi-layer and multi-pass welding. For joint between two bulks of V-butt bane octal, there are four kind weld rods chosen, three of which are carbon steels and marked as A, B and C, and one of which is a stainless steel and marked as D. The microstructure of each joint bead is observed by the optical microscope. According to ASTM ESM, the standard tensile specimens were made to run tensile teat. After tensile fracture, the composition of each cross section was analyzed in SEM and EDS. The experimental results are:1. The compositions of welding rods A. B, and C are medium carbon steel, the microstructure varied from pearlite to bainite when areas are changed from root to cover in the welded joint. The yield strength is about 360MPs and the ultimate tensile strength is about 460MPa observated from SEM, the fracture is due to ductile failure.2. In addition to Fe and C, wleding rod D includes some Cr and Ni. After welding, the sliced surface is bright and the feature is also close to stainless steel. The composition is Austenitic-Ferritic Stainless steel, known as Dual Phase Stainless Steel. The yield strength and the ultimate tensile strength are 35% and 65% stronger than welding rod A. B and C. The fracture is due to ductile failure and the dimple is finer than other rods. |
本系統中英文摘要資訊取自各篇刊載內容。