保護氣體加氮對沃斯田鐵不銹鋼銲道肥粒相之影響

Effect of Nitrogen is added in Argon Shielding Gas on the Retained Ferrite of Austenitic Stainless Steel Weld Metals

曾光宏(K. H. Tseng) ； 周長彬(C. P. Chou)

《材料科學與工程》 33卷2期 (2001/06) Pp. 89-93

https://doi.org/10.6409/JMSE.200106.0089

摘要

本研究目的主要在探討保護氣體（氬氣）添加不同體積百分比的氮氣含量對沃斯田鐵不銑鋼銲道肥粒相之影響。實驗材料選用SUS 304與SUS 310兩種沃斯田鐵型不銑鋼，銲接方法採用自牛氣護鎢極電弧銲，以Ferritscope肥粒相測定儀來量測304不鐫鋼銲道之肥粒相含量。實驗結果顯示在保護氣體中添加少許的氮氣含量時，將會導致304不鐫鋼銲道肥粒相含量的急遽降低。本實驗亦發現在304不鐫鋼銲道焙融線附近之未混合焙融區內的肥粒相型式與所添加的氮氣含量比例是沒有任何的關聯性，亦即氮氣含量的添加並不會造成未混合焙融區微觀組織的改變（仍為雙相結構）。

關鍵字

氮 ； 殘留肥粒相 ； 不銹鋼 ； 未混合熔融區

並列摘要

The objective of this study was to investigate the effect of nitrogen is added in argon shielding gas on the retained ferrite of austenitic stainless steel welds. An autogenous gas tungsten arc welding was conducted on austenitic stainless steels 304 and 310 to produce a bead-on-plate weld. The delta-ferrite content of 304 stainless steel welds was measured by using Ferritscope. The present results indicated that the retained ferrite content in Type 304 stainless steel weld metals was rapidly reduced as the nitrogen addition in argon shielding gas was increased. This experiment result also found that an unmixed fusion zone usually occurs in the weld metal near the fusion line if the base metal has a positive delta-ferrite potential. The addition of nitrogen in the shielding gas does not change the microstructure of an unmixed fusion zone in Type 304 stainless steel welds.

並列關鍵字

Nitrogen ； Retained ferrite ； Stainless steel ； Unmixed fusion zone