焊缝金属铁素体含量对氢裂敏感性的影响

Influence of ferrite contents in duplex stainless steel weld metal on hydrogen cracking susceptibility

关键词:  氢致裂纹  双相不锈钢  焊缝金属  铁素体

Key words:  hydrogen cracking  duplex stainless steel  welding metal  ferrite

摘要:

采用试验室制造的不同成分的焊丝,用Ar+H₂混合气体保护的TIG焊方法,通过纵向焊道拉伸拘束裂纹(LB-TRC)试验和焊缝金属恒应变速率拉伸(WM-SERT)试验,定量研究了双相不锈钢焊缝金属中铁素体含量对氢致裂纹敏感性的影响。结果表明,当双相不锈钢焊缝金属中δ铁素体含量小于50%时。焊缝金属对氢致裂纹不敏感;当δ铁素体含量大于50%时,随铁素体含量的增加,氢裂敏感性显著增加。

Abstract:

The influence of ferrite contents in duplex stainless steel weld metal on hydrogen cracking susceptibility was investigated quantitatively by means of the Longitudinal Butt-Tensile Restraint Cracking (LB-TRC) test and the Weld Metal-Slow Extension Rate Test(WM-SERT) methods and by using laboratory made filler wire with various compositions and TIG welding method with Ar+H₂ mixed shielding gas. It is shown that the weld metal is not susceptible to hydrogen cracking until the ferrite contention duplex stainless steel weld metal reached 50%, and when ferrite content is more than 50%, its hydrogen cracking susceptibility markedly increases with the increase of ferrite content.