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熱處理工藝對AZ31組織與力學性能的影響

時間:2019-05-19 18:57來源:畢業論文
所用的AZ31鎂合金軋制板材,經300℃加溫30min空冷和350℃、20min空冷處理后,其室溫塑性得到了大幅提高,其中在300℃下保溫30min的室溫力學性能最佳,屈服強度由原始樣的195MPa縮小到165

摘要:鎂合金具有密排六方晶體的結構,室溫下僅僅只有一個基面滑移系,所以鎂合金的室溫塑性比較差,變形困難,而且非常容易出現變形缺陷,大大限制了鎂合金的廣泛應用與推廣。目前,如何改善提高鎂合金的室溫塑性已經成為了鎂合金在工業中廣泛應用中的最大的問題。人們已經發現,細化晶粒能夠有效的提高鎂合金塑性的一種有效手段。本文主要研究熱處理對AZ31鎂合金軋制板材顯微組織、力學性能的影響,旨在探索一種經濟合理的熱處理工藝來提高鎂合金板材在室溫下的塑性,促進鎂合金的廣泛應用與推廣。35584
    對AZ31軋制板材進行熱處理,熱處理溫度為250℃~350℃,保溫時間為10~60min,冷卻方式均采用空冷。采用顯微組織分析和力學性能測試的方法研究了不同熱處理工藝參數對AZ31鎂合金軋制板材的組織和性能的影響。
    顯微組織結果觀察表明,熱處理過程中軋制組織發生了靜態再結晶,再結晶后組織趨于均勻化,孿晶消失、平均晶粒尺寸變小,經300℃加溫30min空冷和350℃、10min空冷處理后,孿晶完全消失,晶粒細小且均勻。
    本文研究結果表明,本實驗所用的AZ31鎂合金軋制板材,經300℃加溫30min空冷和350℃、20min空冷處理后,其室溫塑性得到了大幅提高,其中在300℃下保溫30min的室溫力學性能最佳,屈服強度由原始樣的195MPa縮小到165MPa,抗拉強度由原始樣的287MPa縮小到258MPa,斷后伸長率由原始樣的10.167%增長到20.12%。
畢業論文關鍵詞:AZ31鎂合金軋制板材;熱處理;顯微組織;室溫力學性能
Microstructure and Properties of AZ31 magnesium alloy with annealing treatment 源¥自%六:維;論-文'網=www.aftnzs.live
ABSTRACT:Magnesium alloys have close the hexagonal crystal structure.At room temperature with only a basal slip department, so the room temperature plasticity of magnesium alloys are relatively poor, Therefore the room temperature ductility Mg alloys are relatively poor, deformation of difficult and the very vulnerable distortion defects in, greatly limiting the widespread Application and Popularization in magnesium alloy. Currently, ways to improve the to improve the the ambient ductility of of magnesium alloy of magnesium alloys has become wide application in industry in the biggest problem.Mody human have discovered that the grain refinement can effectively improve the plastically of a the magnesium alloys effective means.Main research influence the heat treatment In this paper AZ31 sheet microstructure, Magnesium Alloy Sheets Processed at a room temperature, promote the extensive Application Popularization magnesium alloy.
    AZ31 rolled plate heat treatment, heat treatment temperature of 250 ℃ ~ 250 ℃, holding time for 10 to 60 min, adopts air cooling cooling way. Adopted the microetructure analysis and mechanically testing methods to study effects of different Heater Treatment processes partments in microestructure and on performance of AZ31 magnesium alloy the rolled material.
    Results of microstructure observation showed that the heat treatment process of static recrystallization organization of rolling and the recrystallization organization tend to be homogenization, twin disappear, the average grain size decreases, the 300℃ heating 30min air cooling and 350 ℃, 10min after cold treatment, twin disappear entirely, grain fine and uniform.Mechanics performance test results show that the board room temperature plasticity of get improved after heat treatment
    In this paper, the research results show that AZ31 magnesium alloy rolling sheet used in this study, by the 300℃ heating 30 min air cooling and 350℃, 20 min after cold treatment, its plasticity at room temperature has been greatly increased, the heat preservation under 300 ℃ for 30 min at room temperature mechanical properties of the best, the yield strength of the original sample of 287MPa to 257MPa, the tensile strength of the original sample of 285MPa to 256MPa, break elongation ratio from 10.167% to 20.12% of the original sample. 熱處理工藝對AZ31組織與力學性能的影響:http://www.aftnzs.live/cailiao/20190519/33609.html
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