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Introduction Duplex stainless steels are a combination of austenite and fer-rite, and some grades employ nitrogen as an alloying ingredient which promotes austenite formation in welds and improves tough-ness.
介绍了双相不锈钢是一种由奥氏体和铁的仪式,有的年级使用氮作为合金成分,促进奥氏体的形成和提高焊缝的韧性.
In standard laser welding, using argon as the shield gas,nitrogen can be lost from the weld pool and the austenite con-tent of the weld will be reduced.
在标准的激光焊接,使用氩气作为保护气体,氮气可以从熔池失去和焊接的奥氏体含量会降低.
Kyröläinen and Lukkari (1999)and the Outokumpu welding handbook (Outokumpu, 2010) have noted that a low austenite content can lead to nitride precipita-tion, which has a negative effect on weld corrosion properties and toughness.
kyr的öLä惰性和Lukkari（1999）和奥托昆普公司焊接手册（奥托昆普,2010）指出,一个低的奥氏体含量可导致氮化物沉淀,具有焊缝腐蚀性能和韧性的影响.
It has been noticed by Keskitalo and Mäntyjärvi (2013) that nitrogen shielded austenitic laser welds have a higher hardness than argon shielded welds.
它已经被凯斯基塔洛和MäntyjäRVI（2013）注意到,氮气保护奥氏体激光焊接具有较高的硬度比氩焊.
Westin and Serrander (2012) have notedthat using nitrogen as the backing gas had a measurable positiveeffect on the weld metal austenite formation when welding with CO2 lasers.
威斯汀酒店和serrander（2012）指出,使用氮气作为后盾的气体对焊缝金属的奥氏体形成焊接时用CO2激光器的一个可衡量的积极作用.
This paper investigates the idea that if nitrogen is used as theshield gas some of it would dissolve into the weld pool, compen-sating for the amount lost by evaporation.
本文研究的想法,如果使用氮气作为掩护气体会溶解在熔池,补偿蒸发掉的量.
Kyröläinen et al. recommend the WRC-92 diagram for duplex weld material. The presence of nitrogen promotes the formation of austenite in duplex stainless steels according to the following equations (Kyröläinen and Lukkari, 1999):Ni-equivalent (Ni eq)=%Ni+(%C×35)+(%N×20)+(%Cu×0.25)(1)Cr-equivalent (Cr eq)=%Cr+%Mo+(%Nb×0.7) (2)
kyr的öLä惰性等.推荐的双面焊接材料的wrc-92图.氮的存在促进了双相不锈钢中奥氏体的形成根据下列方程（KYRöLä惰性和Lukkari,1999）：Ni当量（Ni当量）= %的Ni +（%的C×35）+（%N×20）+（%的Cu×0.25）（1）Cr等效（CR EQ）= %的Cr Mo +（铌×0.7）（2）