本文關(guān)鍵詞： 蠕墨鑄鐵 活塞環(huán) 蠕化率 組織性能　出處：《中北大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：蠕墨鑄鐵作為近年來的新型工程材料,由于其在耐磨性、強(qiáng)度、導(dǎo)熱性、抗熱疲勞性上具有很大優(yōu)勢,制成的發(fā)動(dòng)機(jī)零件具有體積小、強(qiáng)度高、耗能少等優(yōu)點(diǎn),在包括動(dòng)力設(shè)備關(guān)鍵零件等領(lǐng)域具有良好的發(fā)展前途。 本文圍繞解決活塞環(huán)的材料選用及活塞環(huán)的產(chǎn)品質(zhì)量展開。通過對活塞環(huán)選用的材料RuT350進(jìn)行熔煉工藝研究,采用12Kg中頻感應(yīng)電爐熔煉蠕鐵,得出穩(wěn)定合理的鑄態(tài)蠕墨鑄鐵活塞環(huán)的熔煉工藝。通過改變?nèi)浠瘯r(shí)間和添加合金元素A1研究其對提高薄壁蠕墨鑄鐵件的蠕化率的效果。對活塞環(huán)進(jìn)行實(shí)際澆注并測試其性能效果,得到了較好的實(shí)驗(yàn)效果,生產(chǎn)出了合格的蠕墨鑄鐵活塞環(huán)。實(shí)驗(yàn)得出的結(jié)論如下： (1)在使用含硫量低的特級生鐵時(shí),12Kg中頻電爐的蠕墨鑄鐵蠕化處理工藝是：蠕化劑使用量(0.45%),蠕化時(shí)間(30s),出鐵溫度(1560℃),澆注溫度(1410℃)。 (2)本試驗(yàn)條件下,蠕化時(shí)間35s時(shí)蠕化效果最佳。 (3)A1加入量0.5%時(shí)蠕化效果最佳,壁厚10mm以下蠕化率提高20%-40%1壁厚10mm以上,蠕化率增加不明顯。 (4)在蠕墨鑄鐵斷面小于10mm時(shí),蠕墨鑄鐵存在組織不均勻性較高。壁厚大于10mm時(shí)蠕墨鑄鐵組織不均勻性較低。
[Abstract]:Vermicular graphite cast iron as a new engineering material in recent years, because of its wear resistance, strength, thermal conductivity, thermal fatigue resistance has a great advantage, the engine parts made of small volume, high strength, less energy consumption and so on. It has a good development prospect in the fields including power equipment key parts and so on. The material selection of piston ring and the product quality of piston ring are discussed in this paper. Through the study of melting technology of RuT350, a 12kg medium frequency induction furnace is used to smelt vermicular iron. The stable and reasonable melting process of cast graphite cast iron piston ring is obtained. By changing the vermicular time and adding alloy element A1, the effect of improving vermicular rate of thin wall vermicular graphite cast iron is studied. The practical pouring of piston ring is carried out. And test its performance effect. Good experimental results were obtained and qualified vermicular graphite cast iron piston rings were produced. The experimental results are as follows: 1) the vermicular cast iron vermicular treatment process of 12kg medium frequency furnace with low sulphur content is as follows: the amount of vermicularizing agent is 0.45 and the vermicularization time is 30 s). The casting temperature is 1560 鈩，

本文編號：1488434