摘要
文中设计开发了5种不同B含量的C-M-C-Ni合金系原油船耐蚀钢全位置药芯焊丝,采用100%CO_2气体保护焊接方法制备了B含量为0%~0.013%的熔敷金属,利用光学显微镜(OM)与扫描电子显微镜(SEM)微观组织表征方法研究B含量对原油船耐蚀钢全位置药芯焊丝熔敷金属组织演变的影响,并通过冲击试验评估其力学性能。结果表明,熔敷金属随着B含量从0增加到0.001 3%,焊缝区内侧板条铁素体(FSP)组织得到抑制,针状铁素体(AF)组织比例增加,形态细小,并呈交叉分布,低温韧性值KV_2(-40℃)从34 J增加到102 J;B含量从0.006 0%增加到0.013%,焊缝区FSP和先共析铁素体(PF)组织消失,以AF组织为主,低温韧性值KV_2(-40℃)从101 J增加到118 J。当B含量为0.013%时,C-Mn-Ni-Cu合金系原油船耐蚀钢全位置药芯焊丝熔敷金属低温冲击韧性值KV_2(-40℃)最佳。
Five types of C-Mn-Ni-Cu all-position flux-cored wires with varying B contents are designed and developed for corrosion-resistant steel in crude oil tanker.Deposited metals with B contents ranging from 0%to 0.013%are prepared using 100%CO 2 gas shielded welding.Optical microscopy(OM)and scanning electron microscopy(SEM)are employed to study the effect of B content on the microstructure evolution of the deposited metal.Mechanical properties are evaluated through impact tests.The results indicate that as the B content increases from 0%to 0.0013%,the formation of Ferrite side plate(FSP)within the weld zone is suppressed,and the proportion of acicular ferrite(AF)increases,exhibiting a refined microstructure with an interlocking distribution.Consequently,the low-temperature impact toughness value KV 2(-40℃)increases from 34 J to 102 J.As the B content further increases from 0.0060%to 0.013%,both FSP and proeutectoid ferrite(PF)disappear within the weld zone,and the microstructure is AF.This leads to an increase in the low-temperature toughness KV 2(-40℃)from 101 J to 118 J.The deposited metal of the C-Mn-Ni-Cu all-position flux-cored wire for corrosion-resistant steel in crude oil tanker reaches its highest low-temperature impact toughness value KV 2(-40℃)at a B content of 0.013%.
作者
孙超
费大奎
李荣
王子然
刘厚涛
谷森
SUN Chao;FEI Dakui;LI Rong;WANG Ziran;LIU Houtao;GU Sen(CRRC Dalian Locomotive and Rolling Stock Co.,Ltd.Carbody Branch Factory,dalian 116022,China;Harbin Welding Institute Limited Company,Harbin 150028,China;Harbin University of Commerce,Harbin 150028,China;Nanjing Yitao Technology Co.,Ltd.,Nanjing 210008,China;Changzhou University,Changzhou 213164,China)
出处
《机械制造文摘(焊接分册)》
2025年第5期18-22,共5页
Welding Digest of Machinery Manufacturing
关键词
原油船耐蚀钢
全位置药芯焊丝
B元素含量
低温韧性
针状铁素体
扫描电子显微镜
crude oil tanker corrosion-resistant steel
all-position flux-cored wire
B content
low-temperature toughness
acicular ferrite
SEM
