Effect of Mn Content on Microstructure and Mechanical Properties of Weld Metal During High Heat Input Welding Processes

被引：13

作者：

Song, F. Y. ^{[1
,2
]}

Shi, M. H. ^{[2
]}

Wang, P. ^{[1
]}

Zhu, F. X. ^{[2
]}

Misra, R. D. K. ^{[3
]}

机构：

[1] Northeastern Univ, Key Lab Electromagnet Proc Mat, Minist Educ, Shenyang 110819, Peoples R China

[2] Northeastern Univ, State Key Lab Rolling & Automat, Shenyang 110819, Peoples R China

[3] Univ Texas El Paso, Dept Met & Mat Engn, Lab Excellence Adv Steel Res, El Paso, TX 79968 USA

来源：

JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE | 2017年 / 26卷 / 06期

基金：

中国国家自然科学基金;

关键词：

acicular ferrite; high heat input welding; toughness; weld metal; AFFECTED ZONE; STEEL;

D O I：

10.1007/s11665-017-2597-7

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

To elucidate the effect of Mn content on the microstructure and mechanical properties of weld metal, flux-cored wires with three different Mn contents were prepared to conduct high heat input welding experiments. Complex inclusions and Mn-depleted zones were observed in the weld metal with heat input of 85 kJ/cm. The study indicated that complex inclusions enabled nucleation of acicular ferrite with interlocking structure, leading to enhanced impact toughness. With decrease in Mn content, the number of complex inclusions with Mn-depleted zone and the volume fraction of acicular ferrite were both decreased. Additionally, the impact toughness of weld metal was significantly degraded with lower Mn content present in martensite-austenite (M-A) constituent and bainite.

引用

页码：2947 / 2953

页数：7

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