摘要
设计不同Mn元素与Ni元素质量比的Fe-Mn系药芯焊丝,采用电弧增材制造的方式进行无磁钢薄壁结构件的堆积,采用显微组织观察以及性能测试手段对试样进行测试.结果表明,室温组织均以奥氏体为主,在晶界处析出少量蠕虫状铁素体,随着Mn元素与Ni元素质量比的增加,奥氏体晶粒发生细化,同时由等轴状转变为扁平状,另外铁素体晶粒也发生了一定程度的细化.随着Mn元素含量的增加,造成了夹杂物的增加,夹杂物由金属氧化物转变为金属沉淀.在层错能降低及固溶强化增强的共同作用下,随着Mn元素与Ni元素质量比的增加,抗拉强度、屈服强度以及显微硬度有所提高,但塑韧性也有所降低.对不同Mn元素与Ni元素质量比的Fe-Mn系试样进行层错能计算.结果表明,随着Mn元素与Ni元素质量比的增加,层错能降低.随着Mn元素与Ni元素比的增加,其磁导率有所降低,均满足无磁钢所要求的范围.
Three groups of Fe-Mn system flux-cored wires with different Mn/Ni mass ratios were designed for the stacking of thinwalled structural parts of non-magnetic steel by wire and arc additive manufacturing,and the three groups of specimens were tested by means of microstructural observation and performance testing.The results show that the microstructure of the three groups of specimens at room temperature is dominated by austenite,with a small amount of worm-like ferrite precipitated at the grain boundaries,and with the increase in Mn/Ni mass ratio,the austenite grains are refined and transformed from equiaxed to flattened at the same time.In addition,the ferrite grains also undergo a certain degree of refinement.With the increase in inclusions caused by the increasing Mn element,the inclusions are transformed from metal oxides to metal precipitates.With the increase in Mn/Ni mass ratio,the tensile strength,yield strength,and microhardness of the specimen increase,which is due to the combined effect of the reduction in the stacking fault energy and solid solution strengthening enhancement,but its plastic toughness has also been reduced.Calculations of the stacking fault energy of three groups of Fe-Mn system specimens with different Mn/Ni mass ratios show that the stacking fault energy of the specimens decreases with the increase in the Mn/Ni mass ratio.The permeability decreases as the Mn/Ni mass ratio increases,all of which satisfy the required range for non-magnetic steels.
作者
张敏
周文坤
刁健帅
郭斯阳
张志强
毛威
ZHANG Min;ZHOU Wenkun;DIAO Jianshuai;GUO Siyang;ZHANG Zhiqiang;MAO Wei(School of Materials Science and Engineering,Xi’an University of Technology,Xi’an,710048,China)
出处
《焊接学报》
北大核心
2026年第1期32-41,共10页
Transactions of The China Welding Institution
基金
陕西省重点研发计划项目(No.2023-YBGY-470)
陕西省重点研发计划项目(2023KXJ-234)
西安市科技计划项目(23KGDW0004-2022)
国家石油天然气管材工程技术研究中心开放课题(KFKT2024-3)。
关键词
电弧增材制造
Mn/Ni质量比
奥氏体
强度
无磁性能
wire and arc additive manufacturing
Mn/Ni mass ratio
austenitic
strength
non-magnetic property
