600MPa級(jí)高強(qiáng)鋼微合金化藥芯焊絲研制及電化學(xué)特性研究
[Abstract]:Marine engineering equipment is in a low temperature environment all year round and is subjected to the common corrosion of sea water and atmosphere. Because of its harsh service conditions, marine equipment steel must have both high strength, high toughness and excellent low temperature impact toughness and corrosion resistance to sea water and atmosphere. The harshness of equipment service environment requires higher welding process and welding joint quality. At present, the research on the transition of microalloyed elements to weld metal in order to improve its microstructure, mechanical properties or second equivalent is mainly focused on the traditional electrode coating, compared with the traditional welding methods such as flux-coated electrode arc welding, etc. In the process of flux-cored wire welding, the transfer mode of droplet is different, the welding process is mostly multi-layer and multi-pass welding with large wire energy, and the microstructure and properties of the weld are also different after forming. However, relative modification experiments on weld metal of 600MPa grade high strength steel flux-cored wire are rare. Based on a certain flux-cored wire alloy system and the addition of quantitative mixed rare earth and Cu elements, the 600MPa marine equipment low alloy high-strength steel cored wire was produced and many groups of welded joint samples were prepared for test. The effect of rare earth and Cu on the properties of weld metal was obtained. In this paper, 600MPa grade high strength steel flux-cored wire with different amount of mixed rare earth and Cu was fabricated by cold rolled steel strip forming method, and the welding joint was made. The microstructure, comprehensive mechanical properties and electrochemical properties of weld metal were analyzed by means of metallographic microscope (SEM) EDSX XRD, electrochemical accelerated corrosion test and mechanical property test, and the influence rules were summarized according to the experimental results. It provides a reference for the micro alloying of the flux-cored wire. The experimental results show that the addition of rare earth elements has an obvious effect on the microstructure and mechanical properties of weld metal. The homogeneity of microstructure and grain size decreases. In the range of suitable content, the low temperature impact toughness, hardness, yield strength and tensile strength are all increased to a large extent. Re reaches 606 MPa / m to 753 MPA / a, and the overall trend is to increase first and then decrease. In addition to promoting the formation of acicular ferrite to a certain extent, the addition of the second phase particles of suitable size also leads to the production of intergranular enrichment, which is beneficial to the nucleation of the grain and the formation of acicular ferrite. It has no effect on the yield strength, tensile strength and low temperature impact toughness of the weld metal, and the mechanical properties of the weld metal are developing in an unfavorable direction. In terms of electrochemical properties, the addition of two elements can improve the corrosion resistance of weld metal to some extent. The electrochemical test results show that the more rare earth is added, the smaller the corrosion current is and the larger the arc radius of capacitive reactance is, the better the corrosion resistance is. However, the addition of Cu has an optimum range of 0.28% 0.72%, and the corrosion current is smaller and the total impedance value is higher. Corrosion resistance is relatively stable. Therefore, in the process of microalloying the weld metal, the rare earth element can improve the overall properties of the weld metal more obviously, while Cu can promote the corrosion resistance of the weld metal, but it can be used as the engineering structure material. The structural properties of weld metal were not obviously improved.
【學(xué)位授予單位】:合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TG42
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