AISI304不?袟饐IG銲接後熱處理機械性質研究

Study on Mechanical Properties of Heat Treated AISI304 Stainless Steel Tig Weldment

范吟傑(gues)

指導教授 ： 周長彬 ； 林靜

國立臺灣師範大學/科技學院/工業教育學系/碩士(1999年)

摘要

本研究所選用的材料為AISI304沃斯田鐵型不?袗?，以ER308不?袗?銲條為填料，銲接方法使用惰性氣體鎢極電弧銲法（TIG），母材以對接方式進行銲接，並施予不同程度之高溫熱處理後，對材料進行拉伸試驗、微硬度測試、肥粒相量測以及金相顯微組織觀察與SEM破斷面分析；以探討不同條件下，材料機械性質、肥粒相含量、微觀結構之變化情形，期望藉此研究能提供不?袗?材料銲接時之應用與參考。
實驗結果顯示，熱處理無法提高AISI304不?袗?之強度與硬度值，但可有效降低銲道內之肥粒相含量，伸長率則有隨熱處理之溫度、時間之升高而增加之趨勢。銲件拉伸破斷面經由SEM觀察顯示，拉伸破斷之原因係為延性破斷，且在1050℃時，晶粒有明顯粗大化之現象。

關鍵字

不?袟 ； 銲接 ； TIG

並列摘要

The purpose of this Research was to systematically study the weldability of stainless steel under Tungsten Inert Gas Arc Welding (TIG).
The base metals used was AISI 304 austenitic stainless steel with filler metal of ER308 in the type of plane joint . Different post weld heat treatment of the 304 stainless steel weldments were conducted. A series of experiments including tensile testing , microhardness testing , optical metallography and SEM analysis were used to determine the relationship between mechanical properties and microstructure of the 304 stainless steel weldments.
The results showed that , there is no obvious difference in the strength and hardness of AISI304 stainless steel after heat treatment , but can decrease the ferrite scope in the fusion zone. Beside , SEM ( Scanning Electron Microscope ) can be observed on the tensile tested specimen showed a ductile fracture surface.And in the temperature of 1050℃, heat treatment caused recrystallization and increase in grain size.

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