奥氏体型合金熔化焊接头微观组织不均匀性及对疲劳性能影响的研究

Microstructural Nonuniformity and Fatigue Properties of Welded Joints of Austenitic Alloys

摘要:

研究了１Ｃｒ１８Ｎｉ９Ｔｉ和ＧＨ１５０合金熔化焊接头微观组织的不均匀性及其对疲劳性能的影响。由金相分析方法得出它们热影响区组织的特殊性和接头各区域组织分布特点。结果表明，该焊接接头的熔合区组织不均性最为严重，是该接头疲劳性能最为薄弱的部位。用１Ｃｒ１８Ｎｉ９Ｔｉ对接氩弧焊试样做低周疲劳试验得到：焊接试样的应变疲劳寿命比相应的光滑试样降低５０％左右，并且疲劳源几乎全部产生在熔合区

Abstract:

The microstructural nonuniformity and fatigue properties of welded joints of austenitic alloys are investigated. The microstructural character of the welded Joints is studied using optical metallograph microscope. The experimental results show that the degree of microstructural nonuniformity is highest within the range of the bonded junction, and the fatigue resistance is lowest within the bonded zone. The results of low cycle fatigue test also show that, for the argon are welded 1Cr18Ni9Ti joint, the strain cycling fatigue lifetime of is only about half of that of the base metal, and the fatigue cracks always develop first in the bonded zone of welded joint.