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为研究稀土在09CuPTi(RE)钢中的作用机理,首先需研究稀土分别与铜、磷,钛的相互作用。本文用固体电解质电池定氧、低温无水电解及等离子发射光谱等测试手段,研究了Fe-Cu-Ce,Fe-P-Ce,Fe-Ti-Ce溶液体系在1600℃平衡时溶质元素的相互作用规律。得到1600℃铁液中铈分别与铜、磷、钛相互作用系数e_(Ce)~(Cu)、e_(Ce)~P、e_(Ce)~(Ti);观察到铈不与铜、磷、钛生成金属间化合物,而与微量氧、硫生成Ce_2O_2S型化合物;得到1600℃时反应Ce_2O_2S=2[O]+2[Ce]+[S]的平衡常数K。用金相和岩相显微镜、扫描电镜、电子探针及X射线衍射等方法研究了稀土对09CuPTi(RE)钢的脱氧、脱硫作用、对夹杂物球化变性作用、提高力学性能的机理、以及稀土在该钢中的固溶量,并通过室内加速腐蚀试验研究了09CuPTi(RE)钢的耐大气腐蚀机理,得到了稀土在09CuPTi(RE)钢中的作用机理。
In order to study the mechanism of rare earth in 09CuPTi (RE) steel, we first need to study the interaction of rare earth with copper, phosphorus and titanium respectively. In this paper, solid electrolyte battery oxygen, low temperature anhydrous electrolysis and plasma emission spectroscopy and other testing methods to study the Fe-Cu-Ce, Fe-P-Ce, Fe-Ti-Ce solution system at 1600 ℃ equilibrium of solute elements The law of action. The e_ (Ce) ~ (Cu), e_ (Ce) ~ P and e_ (Ce) ~ (Ti) of the cerium in the molten iron at 1600 ℃ were obtained respectively. The interaction between cerium and copper, phosphorus and titanium was observed. , Titanium forms an intermetallic compound, and forms a Ce_2O_2S compound with trace amounts of oxygen and sulfur. The equilibrium constant K of Ce_2O_2S = 2 [O] +2 [Ce] + [S] at 1600 ℃ is obtained. The effects of rare earth on the deoxidation and desulfurization of 09CuPTi (RE) steel, the spheroidization and denitrification of 09CuPTi (RE) steel and the mechanism of improving the mechanical properties were studied by metallographic and petrographic microscope, scanning electron microscopy, electron probe and X-ray diffraction The amount of rare earth dissolved in the steel and the mechanism of atmospheric corrosion of 09CuPTi (RE) steel were studied by accelerated indoor corrosion test. The mechanism of rare earth in 09CuPTi (RE) steel was obtained.