【摘要】：對(duì)鑄態(tài)高韌性球墨鑄鐵QT400-18的凝固過(guò)程進(jìn)行電脈沖處理,電脈沖參數(shù)為電壓2 600 V,頻率0.88 Hz,電容200μF,處理時(shí)間15min。通過(guò)對(duì)比試驗(yàn)可知:電脈沖處理可使鑄鐵的過(guò)冷度相比未處理的升高12K,改善了石墨形核和生長(zhǎng)的動(dòng)力學(xué)條件,從而使球狀石墨的粒徑減小,石墨球數(shù)量增加。鑄鐵經(jīng)過(guò)電脈沖處理,球化率由未處理的平均80%提高到平均91%,石墨球數(shù)由平均172/mm~2提高到209/mm~2,石墨不易變態(tài)生長(zhǎng),圓整度得到改善。同時(shí),球墨鑄鐵的凝固組織得到了改善,鐵素體數(shù)量增加,達(dá)到83%,相比未電脈沖處理的試樣提高了26.6%,鐵素體晶粒小于未處理試樣,基體中分布的珠光體數(shù)量和片層間距減少,在抗拉強(qiáng)度符合要求的條件下,伸長(zhǎng)率提高了4.89%,-233K的沖擊功Akv提高了3.56J。
[Abstract]:The solidification process of as-cast high toughness ductile iron (QT400-18) was treated with electric pulse. The parameters of electric pulse were voltage 2 600V, frequency 0.88 Hz, capacitance 200 渭 F, treatment time 15 min. The comparison experiment shows that the supercooling degree of cast iron can be increased by 12K compared with the untreated one, and the kinetic conditions of nucleation and growth of graphite can be improved. Thus, the particle size of nodular graphite is reduced and the number of graphite spheroids is increased. The spheroidization rate of cast iron was increased from 80% to 91%, and the graphite spheroidal number was increased from average 172/mm~2 to 209% / mm ~ (-2). The graphite was not easily metamorphosed and its roundness was improved. At the same time, the solidification structure of ductile iron was improved, and the number of ferrite increased to 833. Compared with the sample without electrical pulse treatment, the solidification structure of ductile iron was increased by 26.6. the ferrite grain was smaller than that of untreated sample. The number of pearlite distributed in the matrix and the lamellar spacing are reduced. Under the condition that the tensile strength meets the requirements, the impact energy Akv of 4.89- 233K is increased by 3.56J.
【作者單位】： 西安建筑科技大學(xué)冶金工程學(xué)院;陜西省冶金工程技術(shù)研究中心;山西華翔集團(tuán);中冶集團(tuán)陜西壓延設(shè)備廠;
【基金】：西安市技術(shù)轉(zhuǎn)移促進(jìn)工程項(xiàng)目(CX1250(5))
【分類號(hào)】：TG143.5

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