發(fā)布時間：2018-06-17 23:41

  本文選題：9Cr-ODS + RAFM鋼��； 參考：《華中科技大學》2011年碩士論文

【摘要】：本文首先簡單介紹了核聚變的發(fā)展及其優(yōu)點,綜述了第一壁結(jié)構(gòu)材料的運行環(huán)境及其國內(nèi)外研究現(xiàn)狀。基于此,本論文采用粉末冶金(Powder Metallurgic,PM)法制備9Cr-ODS RAFM鋼,將設(shè)計好成分的原始粉末進行機械合金化(Mechanical Alloying,簡稱MA)、氫氣氣氛退火、模壓成型和真空燒結(jié)。分析了MA工藝參數(shù)對合金化效果的影響及原因,研究了燒結(jié)溫度對燒結(jié)體組織及性能的影響,并通過氧化實驗研究合金的高溫抗氧化性能。 研究了不同MA因素對9Cr-ODS RAFM鋼粉末合金化效果的影響,主要包括對球磨時間、球料比(Ball to Powder Weight Ratio,BPR)及過程控制劑(Process Control Agent,PCA)的研究。采用X射線衍射儀(XRD)、掃描電子顯微鏡(SEM)對球磨后粉末進行物相分析及形貌觀察。結(jié)果表明:BPR及球磨轉(zhuǎn)速一定時,隨著球磨時間的延長,合金程度提高;球磨時間一定,BPR越大越有利于合金化;PCA的添加有利于提高出粉率、減弱冷焊現(xiàn)象降低粉末硬度。 探索了燒結(jié)溫度對合金致密化及性能的影響。運用光學顯微鏡(OM)、能譜分析儀(EDS)、拉伸試驗機等儀器,分析測試燒結(jié)體的顯微組織及微區(qū)成分,并測試材料的抗拉強度。結(jié)果表明:燒結(jié)試樣的相對密度、抗拉強度隨著燒結(jié)溫度的提高逐漸增大,當燒結(jié)溫度為1390℃時,二者的值分別為95.4%,562.9MPa,為最佳燒結(jié)溫度。本文還研究了Si的添加和熱等靜壓(HIP)工藝對燒結(jié)體性能影響。HIP可以大大提高合金的抗拉強度(最高達875MPa),添加Si有利于合金的致密化,提高材料的抗拉強度。 將在不同溫度下燒結(jié)的合金于750℃下恒溫氧化95h,分析其氧化動力學曲線,觀察氧化膜的厚度變化及完整性,并對氧化膜成分進行EDS分析。研究表明相同時間氧化后低溫燒結(jié)試樣的氧化增重快,氧化速率常數(shù)大,氧化膜較厚,且缺陷較多。
[Abstract]:In this paper, the development and advantages of nuclear fusion are briefly introduced, and the operating environment of the first wall structure material and its research status at home and abroad are summarized. Based on this, 9Cr-ODS RAFM steel was prepared by powder metallurgy (PM) method. Mechanical alloying (MA), hydrogen atmosphere annealing, moulding and vacuum sintering were carried out. The effect of MA process parameters on the alloying effect was analyzed and the effect of sintering temperature on the microstructure and properties of the sintered body was studied. The oxidation resistance of the alloy at high temperature was studied by oxidation experiment. The effects of different MA factors on the powder alloying effect of 9Cr-ODS RAFM steel were studied, including ball milling time, ball to weight ratio (BPRR) and process control agent process control (PCA). X-ray diffractometer and scanning electron microscope (SEM) were used to analyze the phase and morphology of the powder. The results show that the alloy degree increases with the prolongation of ball milling time and the increase of ball milling time, and the addition of PCA is beneficial to the increase of powder yield and the reduction of cold welding phenomenon and the hardness of powder. The effect of sintering temperature on the densification and properties of the alloy was investigated. The microstructure and microstructure of the sintered body and the tensile strength of the sintered material were analyzed and tested by means of optical microscope, energy spectrum analyzer (EDS), tensile tester and so on. The results show that the relative density and tensile strength of the sintered samples increase with the increase of sintering temperature. When the sintering temperature is 1390 鈩，

本文編號：2032984