不銹鋼與鎳基合金異種金屬銲接之微結構與機械性質研究

Study on Microstructure and Mechanical Properties of Dissimilar Welds Between Stainless Steel and Nickel-Based Alloy

鄭景鴻(Ching-hung Cheng)

指導教授 ： 黃和悅

國立虎尾科技大學/工程學院/材料科學與綠色能源工程研究所/碩士(2014年)

https://doi.org/10.6827/NFU.2014.00032

摘要

本研究主要利用保護性氣體對異種材料銲道熔深能力之影響，銲接方法採用開槽對接方式，Incoloy 800H鎳基超合金與AISI 304不銹鋼以Er-NiCr3作為填充金屬進行接合特性；鎳基合金平均晶粒尺寸遠大於304不銹鋼，且惰性氣體及活性氣體造成熱傳差異造成熱量分佈不均，使得異種金屬銲道背面母材焦黑面積不對稱，在融合區靠近Inconel 800H有較高液化裂紋敏感度。晶界溶化和熱影響區液化裂紋發生藉由兩種主要機制分別如下：一、偏析機制(Segregation Mechanism)；二、滲透機制(Penetration Mechanism)。藉由固溶退火(Solution Annealed)與隨後時效硬化(Age-Hardened)處理，在不同入熱量及銲後熱處理、微硬度，拉伸強度等機械性質測試。

關鍵字

異種金屬 ； 液化裂紋 ； 滲入機制 ； 偏析機制 ； 機械性質

並列摘要

The purpose of this research was mainly to evaluate the characteristics of dissmiliar metal joining of Ni-base 800H and type 304 stainless steel,byEr-NiCr3filling welding metal,single-pass, single-V-groove butt joint,and root opening(gap)etc.,welding technology. Microstructural examination was finded on the ni-base alloy which the average grain size is more than type 304.Due tothermo-durable effect ,a cross-sectional view of a dissimilar welded joint was a non-symmetric heat affected zone. Fusion zone is near Ni-base 800H that liquation cracking is more sensitivity.
Grain melting and liquation cracking have two methods：First is segregation mechanism, Second is penetration mechanism. In virtue of solution annealed and following age treatment. Alternating current thermal inputs,post weld treatment, hardness and tensile strenght test,ets.mechanical property.

並列關鍵字

Dissimilar Metal ； Liquation Cracking ； Segregation Mechanism ； Penetration Mechanism

參考文獻

參考文獻

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[2]“Welding Handbook, Volume 4 - Material and Application, Part 1”, 9th Edition, American Welding Society, 2011.

[3]Philip A. Schweitzer, P. E. “Metallic Materials Physical, Mechanical, and Corrosion Properties” p110, Copyright _ 2003 by Marcel Dekker, Inc. All Rights Reserved.

[4] Prager , M. and Shira , C. S. 1968 . “ Welding of precipitation - hardening nickel – base alloys , ” Welding Research Council Bulletin 128 .