摘要
进行了X80管线钢埋弧焊接试验,分析了其焊缝的成分、显微组织不均匀性特征。焊缝区的Mn、Ni合金元素的成分不均匀程度较小,Ce、Ti、Al等针状铁素体形核元素在焊缝中心区偏析。熔合区至焊缝中心,焊缝组织变化为:柱状晶形态的先共析铁素体及其分布的粒状贝氏体→大块状的粒状贝氏体→小块状的粒状贝氏体和少量的针状铁素体→针状铁素体。试验分析表明,熔合区附近的焊缝金属难以获得针状铁素体,但可以通过调整合金元素,避免高温铁素体生成,而以粒状贝氏体来提高焊缝区的整体强韧性。
Taking the submerged arc weld metal of X80 pipeline steel as example,the heterogeneity of chemical composition and microstructure of high strength low alloy steel weld were analyzed.The results show that the segregation of Mn,Ni elements in the weld is faintish,but the segregation of Ce,Ti,Al elements which can promote the forming acicular ferrite nucleation is serious in the center of the weld.The microstructure evolving from fusion zone to center of the weld is columnar pro-eutectoid ferrite and granular bainite → bulk bainite → refined banite → minor acicular ferrite → acicular ferrite.Therefore,it is difficult to obtain acicular ferrite for fusion zone,but the whole tenacious properties of high strength low alloy steel weld increase by promoting the formation of granular bainite and restricting the formation of pro-eutectoid ferrite.
出处
《热加工工艺》
CSCD
北大核心
2011年第13期139-141,共3页
Hot Working Technology
关键词
高强度低合金钢
埋弧焊缝
合金成分
显微组织
不均匀性
high strength low alloy steel
submerged arc weld metal
alloy composition
microstructure
heterogeneity
作者简介
作者简介：杨晓荣（1973-），男，江西新余人，工学学士，工程师；电话：13761503758；E—mail：yaochwu@sohu．com
