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    磁場熱處理對固態相變的影響(二)
    發布者:河南感應加熱設備有限公司  發布時間:2014-01-17 08:12:49  訪問次數:54

    4.磁場熱處理對材料性能的影響
         在熱處理過程中,施加磁場能改變材料的微觀組織結構因而能有效的改善材料的性能,磁場熱處理能加速相變過程,在實際生產中,具有降低生產成本和縮短生產周期,提高生產效率等優點。
          含碳量0.01的碳鋼由奧氏體向珠光體轉變過程中施加梯度磁場,轉變溫度為560℃時,含Mn或Cr原子的碳鋼硬度與磁場梯度成正比。當磁場梯度為50T/m時,硬度提高了8%,硬度提高的主要原因不是磁力的作用而與鋼的成分有關。在梯度磁場中退火溫度為150℃~200℃時,硬度達到峰值。通過透射電鏡的觀察和內耗的測量得出在梯度磁場下,過飽和碳原子進入珠光體相的鐵素體層。因此,通過淬火使多余的碳原子與Mn或Cr原子結合而達到固溶強化和時效強化的目的[53]
          Fe-xC-1.5%Mn合金(x=0.1,0.2,0.3)在強磁場作用下,采用熱膨脹法測量連續冷卻過程中磁場對鐵素體/奧氏體+珠光體相變溫度的影響,隨著鋼中碳含量的增加,即x=0.1,0.2,0.3,Ar3的溫度成線性增大了2.2,2.4和2.7K/T。Ar1溫度提高了2.5K/T[26]。通過微觀組織分析得到隨著磁場強度的提高鐵素體的面積分數隨之增大,如圖7(a)所示;而韋氏硬度值則成比例減小,含碳量越高,減小的程度越大,如圖7(b)所示。
    5. 結論
          近年來固態相變的報道很多,但大部分都是關于鐵基合金的固態相變,而關于磁場對鎳基高溫合金固態相變影響的報道很少,可以從幾個方面進行研究:
    (Ⅰ)磁場熱處理對鎳基高溫合金組織的影響,其中包括對強化相γ¢、共晶組織γ+γ¢以及碳化物的形貌和含量的影響。
    (Ⅱ)磁場熱處理對鎳基高溫合金性能的影響,可以通過硬度測試和力學測試進行分析。
     
     
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