微合金元素对00Cr12NiTi铁素体不锈钢焊接接头HAZ组织及力学性能的影响

Effect of micro-alloying elements on microstructure and mechanical properties of HAZ in 00Crl2NiTi ferrite stainless steel

通过对比试验,研究了微合金元素对00Cr12NiTi铁素体不锈钢焊接接头HAZ金相组织及力学性能的影响。结果表明,适当降低钢的铁素体化元素,增加奥氏体化元素,以获得室温下更多的低碳马氏体,提高热影响区的力学性能;同时适当增加钛和铌的含量,它们可与镍形成金属间化合物,在钢中弥散析出,起到第二相强化和阻止焊接HAZ晶粒长大的作用。通过此种成分优化方法,在钢材成本增加较少的情况下大大改善了HAZ的组织并提高了其力学性能。

The effect of micro alloying elements in 00Crl2NiTi ferrite stainless steel on HAZ microstructure and mechanical properties was studied by contrast tests.and conclusions were made as follows.Microstructure in HAZ was improved and mechanical properties were increased by appropriately decreasing ferritization elements and increasing austenization elements in the steel,because of more low-carbon martensite formation in room temperature.Meanwhile,increasing Titanium and Niobium contents appropriately,can form inter-metallic compounds with Nickel which precipitated dispersedly in the steel to dispersion-strengthen the steel and prevent grain coarsening in HAZ.By this means of chemical composition optimization,the microstructure in HAZ was greatly improved and its mechanical properties were increased greatly.