微米級的金屬纖維一般使用集束拉伸法，藉由反覆的拉伸與中間熱處理抽製而成。因此在加工過程中，因它們會影響到材料的結構及其機械性質，其拉伸應變量及熱處理溫度的條件控制就很重要。本研究主要使用熱磁分析儀探討不同拉伸應變率的AISI 316L不銹鋼纖維在各種不同熱履歷下的熱磁特性，同時也探討其應變誘發麻田散鐵(α')到沃斯田鐵(γ)的相轉變以及在不同溫度熱處理後的拉伸機械性質。
在300〜520 ℃的時效研究發現，對於冷拉伸應變率大於2.67以上的纖維，當溫度從50 ℃升到約460 ℃時，其磁化增量到一最大值，其主要是由於再相轉麻田散鐵相(α'r)的生成所致。從300 ℃持溫2.5小時後的線上即時磁力顯微影像，觀察到材料磁域結構的成長，說明此係材料本身原有誘發麻田散鐵相的成長。而在冷卻的過程中，從熱磁曲線並無觀察到明顯的Ms溫度。
依據熱磁分析結果，發現經冷拉伸的AISI 316L不銹鋼纖維的升溫熱磁曲線可區分成三個α'→γ相轉區域，在整個相逆轉過程中，主要進行擴散式的相轉機制，不過對於拉伸應變率大於2.31的纖維，其熱磁曲線在625-640 ℃卻出現一個因為α'r延遲相轉變的溫度轉折點，此轉折點溫度隨著應變率之增加而稍微提高。在630-645 °C以上其磁化量會快速地下降，主要是因為α'和α'r同時以擴散及剪切機制進行相轉變。此結果說明了先前在達到最大磁化量所生成的α'r，由於含有較少的Nieq，因此以擴散及剪切機制進行相轉都會在較高的溫度發生。在冷卻的過程中，Ms溫度則是隨著纖維拉伸應變率的增加而下降。
當不銹鋼纖維經過6.16應變率的極度抽拉，其拉伸斷裂強度增加到2042 MPa，斷裂伸度則減少至1.8%。纖維在350〜450 ℃間進行不同溫度熱處理後，其拉伸強度之變化與升溫熱磁分析曲線有相同的趨勢，此說明了α'r相的生成會提高其拉伸強度。

Micron-sized stainless steel fibers are generally manufactured using the bundle-drawing process including repeated drawings and intermediate heat treatments. Therefore, the conditions of drawing strain and annealing temperature are of particular importance because they enable these materials to have various microstructures, which determine the mechanical properties. In this study, the evolution of the magnetic phase upon different thermal history in AISI 316L stainless steel fibers with various true strains are investigated using thermomagnetic analysis (TMA). The phase transformation from strain-induced martensite (α') to austenite (γ) and the tensile property under annealing at different temperatures are also studied.
The ageing study at 300-520 °C shows that the magnetization increases and reaches its maximum from 50 °C to 〜460 °C in cold-drawn fibers with a true strain of above 2.31. The peak magnetization may be resulted from the formation of a reformed martensite phase (α'r). In situ magnetic force microscopy observations reveal a growth of the magnetic domain structure after aging at 300 °C for 2.5 h. Results show that the ferromagnetic property increase during aging at lower annealing temperature resulted from the growth of existing α'-martensite. No significant Ms temperature signal was found in the TMA curves upon cooling.
According to the TMA, three transformation regions of α'→γ in cold-drawn 316L fibers were observed. Throughout the reverse process, the transformation is dominated by a diffusion-controlled mechanism. However, a shoulder which is a retarded transformation of α'r, appears at 625-640 °C in the TMA curve of the cold-drawn 316L fibers with a true strain of above 2.31. The shoulder shifted slightly to a higher temperature as the true strain increased. The magnetization rapidly decreases above 630-645 °C, which was attributed to the reversion of the existing α' and the reformed α' via shear and diffusion-controlled mechanisms simultaneously. The results show that the α'r formed before the maximum magnetization reversed in both mechanisms at higher temperature, which was due to lower Nieq content in the α'r. During the cooling process, the Ms temperature decreased as the true strain of fibers increased.
When the stainless steel fiber was drawn to a true strain of 6.16, the tensile strength increased to 2042 MPa, with a very low elongation of about 1.8%. The tendency in evolution of tensile strength for fibers annealed at 350-450 ℃ was consistent with the relatively thermomagnetic curve. It indicated that the increased tensile strength was attributed to the formation of the α'r phase.

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