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題名 | Mechanism of Bainite Formation in Steels=變韌鐵之形成機構 |
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作 者 | 張柳春; | 書刊名 | 材料科學 |
卷期 | 30:3 1998.09[民87.09] |
頁次 | 頁151-164 |
分類號 | 440.36 |
關鍵詞 | 上變韌鐵; 下變韌鐵; 沃斯田鐵; 位移式變態; Upper bainite; Lower bainite; Austenite; Displacive transformation; |
語文 | 英文(English) |
中文摘要 | 本文以位移式相變態機構為出發點回顧了鋼鐵中變韌鐵之變態行為,包括相變態 及顯微組織的特性等等。變韌肥粒鐵的形成可分為麻田散鐵式的生長與過飽和碳原子擴散至 周圍的沃斯田鐵等兩階段;前者令變韌鐵有不完全變態與表面弛力的現象,後者則關係到上、 下變韌鐵的發生。適當條件下兩衝撞之板狀變韌鐵可造成應合雙晶與界面弓彎,由此可知變 韌鐵/沃斯田鐵的界面移動方式與麻田散鐵相似。本文亦討論外力對變韌鐵變態所造成的影 響;外力除提供額外的(機械)自由能外,並因缺陷的增加後增加變韌鐵的孕核率,但增加 的缺陷也使其生長提前結束。最後本文針對變韌鐵反應後之沃斯田鐵的分解行為作一整理。 |
英文摘要 | The formation mechanism of bainite reaction in steels is reviewed. The characteristics of transformation, morphology and microstructural constituents of bainite are summarized. The bainite transformation is initiated by the growth of bainitic ferrite in a martensitic style, followed by partitioning of excessive carbon into surrounding austenite. Incomplete transformation phenomenon and surface relief are associated with the former stage, while the latter relates to the occurrence of upper/lower bainite. Under certain circumstance, the observations of the α/γ interface propagation in a way consistent with the martensitic manner can be made. The observations include accommodation twinning and interface bowing occurred between the collided bainite plates. Bainite reaction responds to the externally applied stress or strain is considered to behave in a way similar to martensite. The external force contributes to the total driving force by providing mechanical driving force. By introducing defects to austenite, the nucleation density can be enhanced but the propagation of the α/γ interface is likely to be hindered. Finally, the transformation of residual austenite after the cessation of bainite reaction is also discussed. All the information is discussed in the context of displacive transformation mechanism of bainite. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。