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通过中试轧制、电渣压力焊制备了Cu-P-Cr钢及其焊接接头,利用光学显微镜研究了电渣压力焊接接头的组织晶粒度,利用干湿交替实验机、SEM、EPMA、XRD研究了Cu-P-Cr钢及其焊接接头在1.0×10-2mol/L的Na HSO3溶液中的耐腐蚀性能、锈层元素分布及组成,分析了母材与焊接接头的耐腐蚀机理及其影响因素。研究结果表明:焊接接头与母材的腐蚀速率相比碳钢分别为64.6%与61.5%。焊接接头锈层中Cu、Cr元素的大量富集、α-Fe OOH相的转变是腐蚀性能优异的主要原因,而焊缝及熔合区形态各异的铁素体+珠光体+魏氏组织和晶粒尺寸不均等导致了锈层中Cu、Cr富集程度低于母材、腐蚀性能稍弱于母材。
Electro-slag pressure welding was used to prepare Cu-P-Cr steel and its welded joints by pilot-scale rolling. The grain size of electroless-slag welded joints was studied by optical microscope. The dry-wet alternating test machine, SEM, EPMA, The corrosion resistance, rust element distribution and composition of Cu-P-Cr steel and its welded joint in 1.0 × 10-2mol / L NaHSO3 solution were studied by XRD. The corrosion resistance mechanism of the base metal and welded joint was analyzed. Its influencing factors. The results show that the corrosion rates of welded joint and base metal are 64.6% and 61.5% respectively. Weld joint rust layer of Cu, Cr a large number of enrichment, α-Fe OOH phase transition is the main reason for the excellent corrosion resistance, and weld and weld zone morphology of ferrite + pearlite + Wei’s organization and Uneven grain size resulted in the enrichment of Cu and Cr in the rust layer being lower than that of the base metal and slightly weaker in corrosion resistance than the base metal.