【摘要】 研究了Ｐ２０钢中加入微量稀土元素后性能和组织的变化规律。结果表明，稀土元素的加入改变了钢中硫化物夹杂的组成和形貌，粒状复合稀土硫化物夹杂取代了条状硫化锰夹杂，从而提高了钢材的塑韧性、动态断裂韧性和等向性能。给出了钢中硫化物的长宽比与ＲＥ／Ｓ及钢的等向性能与硫化物长宽比的定量关系。更多还原

【Abstract】 The effect of rare earth elements on the microstructure and properties of steel P20 has been investigated.Results show that the composition and morphology of sulphide inclusion are changed as a result of RE addition;the original elongated MnS inclusions are replaced by spherical complex RE sulphides Therefore,the plasticity, toughness,dynamic fracture toughness and mechanical isotropy have been much improved.Quantitative relationships between length/width ratio of sulphide inclusions and RE/S and rnechanical isotropy have been established。更多还原