稀土对2Cr13不锈钢夹杂物的变质及对冲击韧性的影响

Effects of RE on the inclusions and impact toughness of 2Cr13 stainless steel

采用金相、扫描电镜和能谱等分析手段研究了稀土元素铈对2Cr13不锈钢中夹杂物的变质作用以及对冲击性能的影响.结果表明:稀土元素改善了2Cr13不锈钢夹杂物的形貌和大小,未加稀土的钢的断口是典型的解理断裂,加稀土后钢的断口是准解理+韧窝型,韧窝中出现的细小球状稀土硫氧化物夹杂是其转变的主要原因;加微量稀土元素铈的试样低温横向冲击性能比未加稀土的试样大幅度提高,-40℃时提高了54.55%.

The effects of Ce on the inclusions and the impact toughness of 2Cr13 stainless steel were studied by metallographic examination,scanning electron microscope （SEM） and energy spectrum analysis.The results show that adding Ce into the steel improves the shape and size of inclusions.The fracture mode of 2Cr13 stainless steel is typical cleavage fracture,but quasi-cleavage and dimple fracture after adding Ce into the steel,and the spherical inclusions of rare earth oxysulfide in the dimple are the main factor for this transformation.The transverse impact toughness of 2Cr13 stainless steel is improved obviously by rare earth.In comparison with 2Cr13 stainless steel without Ce,the transverse impact toughness of 2Cr13 stainless steel with Ce is increased 54.55% at-40℃.