毕宗岳,杨军,牛辉,芦琳

• 1:国家石油天然气管材工程技术研究中心
• 2:宝鸡石油钢管有限责任公司钢管研究院

摘要(Abstract)：

利用OM、SEM、TEM、EDS、EBSD及Charpy冲击实验对试制的X90钢级螺旋埋弧焊管母材和焊缝冲击断口形貌、近断口区微观组织特征、夹杂物成分、晶粒取向特征、大/小角度晶界占比及低温冲击韧性进行了研究。结果表明,在-10℃下,母材平均冲击功值达314 J,焊缝仅为157 J,母材冲击韧性远优于焊缝。母材试样近断口区显微组织为细小针状铁素体(FAF)+板条贝氏体(LB)+多边形铁素体(QPF)+少量M-A组元,M-A组元呈颗粒状,平均粒径约0.3μm,有效平均晶粒尺寸为2.3μm,大角度晶界比列为91.04%;焊缝试样近断口区组织为AF+QPF+M-A组元+少量先共析铁素体(PF),M-A组元弥散分布,形态多样,平均尺寸1.0~2.0μm,有效平均晶粒尺寸为3.5μm,大角度晶界比列为80.4%。晶粒尺寸粗大、大角度晶界占比偏低和大尺寸尖角型M-A组元是导致焊缝冲击韧性差的主要原因,而大尺寸密集型夹杂物分布使焊缝有更差的冲击韧性。

关键词(KeyWords)： X90管线钢;冲击韧性;焊接接头;针状铁素体

Abstract:

Keywords:

基金项目(Foundation): 国家科技支撑计划项目(2011BAE35B01)

作者(Author): 毕宗岳,杨军,牛辉,芦琳

DOI: 10.13289/j.issn.1009-6264.2017-0126

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