摘要
介绍了Mn-Ni-Mo-Ti-B和Mn-Ni-Mo系气体保护焊焊丝的成分设计原则。对所研制的焊丝进行了熔敷金属的气体保护焊试验,测定了熔敷金属的化学成分、冲击韧度、硬度、强度和显微组织。用扫描电镜分析了断口形貌和夹杂物组成。结果表明,通过焊丝向熔敷金属中加入微量的Ti和B,可以有效地抑制先共析铁素体的析出,使熔敷金属获得细小的针状铁素体组织。研制的X80管线钢用气体保护焊丝的熔敷金属不仅具有很高的强度(ReL≥550MPa,Rm≥620MPa),而且还具有优良的低温韧性(-20℃,Akv≥70J)。
Designing principle of the chemical compositions of the welding wire of Mn - Ni - Mo - Ti - B and Mn - Ni - Mo steel for gas metal arc welding was introduced. The gas metal arc welding was carried out, and the chemical compositions, impact toughness, the hardness, the tensile strength and microstrcture of the deposited metal were tested and determined. The morphology of fracture and the inclusion were also observed and analyzed with the help of SEM. Experiment resuits indicate that it is effective to abate the pro - eutectoid ferrite and make the fine acicular form by means of adding proper Ti and B elements in deposited metal by way of the wire. So the deposited metal with the wire for X80 pipeline steel used gas metal arc welding not only possesses high tensile strength（ReL ≥550 MPa, Rm ≥620 MPa）, and also possesses good toughness at low temperature（ -20 ℃, Akv ≥70 J）.
出处
《焊接》
北大核心
2006年第12期34-38,共5页
Welding & Joining
关键词
X80管线钢
气体保护焊
强度
韧性
针状铁素体
X80 pipeline steel, gas metal arc welding, tensile strength, toughness, acicular ferrite
