Research on development and mechanical properties of Mn-Mo-Cr flux cored wire for high strength steel

WEI Wenyi; QIU Rongpeng

doi:10.7512/j.issn.1001-2303.2020.11.23

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Research on development and mechanical properties of Mn-Mo-Cr flux cored wire for high strength steel
Vol. 50, Issue 11, Pages: 124-128(2020)
Published：2020
DOI： 10.7512/j.issn.1001-2303.2020.11.23
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DOI：

WEI Wenyi, QIU Rongpeng. Research on development and mechanical properties of Mn-Mo-Cr flux cored wire for high strength steel[J]. Eletric Welding Machine2020, 50(11): 124-128. DOI： 10.7512/j.issn.1001-2303.2020.11.23.

摘要

为研制与Q960高强钢相适应的焊接材料

通过调节Mn-Mo-Cr系高强钢药芯焊丝内不同元素配比

分析元素对焊接接头显微组织及力学性能的影响机理

确定各元素的最优含量配比。采用正交试验法

对焊接试样接头进行拉伸试验、冲击试验和显微组织分析。结果表明

综合考虑焊接接头的拉伸性能及冲击性能

焊缝内Mn、Mo、Cr元素含量的最佳配比为:w(Mn)=1.2%

w(Mo)=1.5%

w(Cr)=1.2%。随着Mn和Mo元素含量的提升

接头显微组织由先共析铁素体向针状铁素体及马氏体和贝氏体转变。固溶强化和相变强化作用使得焊接接头的抗拉强度逐渐提升

但断后延伸率逐步下降。针状铁素体含量最大的焊缝具有最优的冲击韧性。

Abstract

In order to develop the welding materials for Q960 high strength steel

by adjusting the ratio of different elements in Mn-Mo-Cr high strength steel flux cored wire

the influence mechanism of element on the microstructure and mechanical properties of welded joint was analyzed

and the optimum element proportion was achieved. The tensile test

impact test and microstructure analysis were conducted based on the orthogonal test. The results show that considering the tensile property and impact property

the optimum ratio of Mn

Mo and Cr in the weld is 1.2 wt.%

1.5 wt.% and 1.2 wt.%.When the Mn and Mo element content increase

the microst-ructure of welded joint transfers from proeutectoid ferrite into acicular ferrite

martensite and bainite. The solution strengthening and phase transformation strengthening make the tensile strength of welded joint improve gradually

but elongation reduces gradually. The weld with the largest acicular ferrite content has the best impact toughness.