Study of the sensitivity of high-strength cold-resistant shipbuilding steels to thermal cycle of arc welding

IF 3.4 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Mechanical and Materials Engineering Pub Date : 2018-02-05 DOI:10.1186/s40712-018-0090-1

Pavel Layus, Paul Kah, Elena Khlusova, Victor Orlov

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引用次数: 17

Abstract

Structure and properties of welded joints of low-alloy thermomechanically processed (09G2FB) and quenched and tempered shipbuilding steels (10XN2MD, 08XN3MD, and 12XN3MF), welded with manual metal arc welding (MMA) and submerged arc welding (SAW), were studied.

Effects of specific energy input on the microstructure, mechanical properties, and impact energy of the heat-affected zone (HAZ) have been investigated, and probable reasons for crack formation in welded joints have been found.

It was found that welding heat input increase leads to a significant increase in grain size near the fusion boundary and the formation of martensite with high hardness. Therefore, the heat input is recommended to be limited to 2.5–3.5?kJ/mm for these specific steel grades.

The study indicates that microalloying elements can be used to limit the grain growth when the steel is subjected to high temperatures during welding thermal cycle. Carbon content and alloying level reduction tend to increase the steel ductility and lower the HAZ toughness.

Abstract Image

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高强度耐寒造船钢对电弧焊热循环的敏感性研究

研究了低合金热加工钢(09G2FB)和调质钢(10XN2MD、08XN3MD和12XN3MF)手工金属电弧焊(MMA)和埋弧焊(SAW)焊接接头的组织和性能。研究了比能量输入对焊接接头热影响区显微组织、力学性能和冲击能的影响，找出了焊接接头裂纹形成的可能原因。结果表明，焊接热输入的增加导致熔合边界附近晶粒尺寸明显增大，形成了高硬度的马氏体。因此，建议将热量输入限制在2.5 ~ 3.5?kJ/mm对于这些特定的钢种。研究表明，在焊接热循环过程中，微合金化元素可以抑制钢在高温下的晶粒长大。含碳量和合金含量的降低会提高钢的塑性，降低热影响区韧性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Mechanical and Materials Engineering MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

8.60

自引率

0.00%

发文量

审稿时长

13 weeks