Influence of Nitrogen on the Structure and Low Temperature Impact Properties of 304 Type Austenitic Stainless Steel Weld Metals by SMAW Process(Materials, Metallurgy & Weldability)

T. Enjo, Y. Kikuchi, H. Moroi
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引用次数: 2

Abstract

Experimental covered electrodes(lime-titania type)were made by selective additions of Mn-nitride or Cr-nitride to the electrode covering. 304LN stainless steel base plates(t=12mm)whose edge preparation was machined to single sided V, 60°included angle were clamped in a jig and were welded together bymulti-pass shielded metal arc welding process.Nitrogen content of wcld metals was adjusted by changing the content of Mn-nltride or Cr-nitride in the electrode covering.Effect of nitrogenon the microstructure of weldmetal, δ-ferrite content, mean grain width, hardness and δ-ferrite secondary arm spacing were studied. Impact test for as welded specimen and solution treated specimen have been carried out at temperature range from 77K to room temperature.Influence of nitrogen on the impact value of wcld metals was mainly discusxsed.Results obtained are summarized as follows:(1)δ-ferrite content in the weld metals is influenced largely by the nitrogen content.(2)Impact value of weld metals increases with increasing of the nitrogen content of the weld metals up to about 1700 ppm after then the impact value falls as the nitrogen further increased.(3)The strengthening mechanism of weld metals due to addition of nitrogen is estimated that the effect of austenitic structure stabilized and inetrstitial solution hardening. Micro fissuring and precipitation of cluster(nitride)in excess of nitrogen containing weld metals decrease the impact value of weld metals.(4)Nitrogen content up to about 1700 ppm of weld metal which is introduced by SMAW process gives a good influence on the impact properties at low test temperature under condition of this study.
氮对304型奥氏体不锈钢SMAW焊接金属组织及低温冲击性能的影响(材料、冶金与可焊性)
通过在电极表面选择性地添加氮化锰或氮化铬,制备了实验覆盖电极(石灰钛型)。304LN不锈钢基板(t=12mm),其边缘加工成单面V形,60°夹角,夹紧在夹具中,通过多道保护金属电弧焊焊接在一起。通过改变电极覆盖层中氮化锰或氮化铬的含量来调节金属氮含量。研究了氮对焊缝金属组织、δ铁素体含量、平均晶粒宽度、硬度和δ铁素体二次臂间距的影响。在77K至室温的温度范围内,对焊接试样和固溶试样进行了冲击试验。重点讨论了氮对世界金属冲击值的影响。结果表明:(1)焊缝金属中δ-铁素体含量受氮含量影响较大;(2)焊缝金属的冲击值随着焊缝金属氮含量的增加而增加,最高可达1700 ppm左右,随后随着氮含量的增加冲击值下降;(3)估计了加入氮对焊缝金属的强化机理,即对奥氏体组织的稳定和氮的固溶硬化的作用。(4) SMAW工艺中引入的高达1700 ppm左右的氮含量对本试验条件下焊缝金属在低温下的冲击性能有很好的影响。
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