鐵-5 鉻-4.5 鎳-2 鉬-0.5 鈦-0.3 鋁-0.2 碳合金分析

Study on Fe-5Cr-4.5Ni-2Mo-0.5Ti-0.3Al-0.2C Alloy

王駿幗(Chun-Kuo Wang)

指導教授 ： 趙志燁

國立屏東科技大學/工學院/機械工程系所/碩士(2009年)

https://doi.org/10.6346/NPUST.2009.00236

摘要

本文主要運用合金設計之概念，以析出硬化型不銹鋼做為發展主
軸，調整合金之鉻含量與鎳含量，並添加其他析出強化微量元素，開發
出一種具有高強度及耐腐蝕之新型鐵鎳鉻合金。利用光學顯微鏡、X 光
繞射分析，穿透式電子顯微鏡等技術，分析鐵-5 鉻-4.5 鎳-2 鉬-0.5 鈦-0.3鋁-0.2 碳合金之機械性質與顯微結構。主要研究結果，如下所示：
本合金之鑄件經1100 ℃/1 小時固溶，於450-650 ℃時效處理，其機
械性質範圍分別為：抗拉強度為965-1380 MPa、降伏強度為930-1260
MPa、延伸率6.5-3.8 %；而鍛件固溶後於450-650 ℃時效處理，其機械
性質範圍分別為：抗拉強度約為1180-1690 MPa、降伏強度約為1040-1520
MPa、延伸率17-8.2 %。
合金經1100℃/1 小時固溶處理，其顯微結構為板狀狀麻田散鐵基地
與TiC 散佈析出物。合金於450 ℃時效，可觀察α 相肥粒鐵形成；提高
時效溫度550 ℃時，則可觀察到L12 結構(Ni3Al)析出物；合金在650-750
℃時效處理時，則可觀察到有M23C6 碳化物，以及沃斯田鐵相形成。

關鍵字

顯微結構 ； 析出強化 ； L12 ； 合金設計

並列摘要

The purposes of the studies are to investigate the phase transformations, mechanical properties and microstructures of Fe-5Cr-4.5Ni-2Mo-0.5Ti-0.3Al-0.2C alloy by use of X-ray diffraction (XRD), optical microscope (OM) and transmission electron microscope (TEM). Some results are described as
following: Being SHT, the ultimate tensile strength, yielding strength and elongation of the alloy are in the range of 965-1380 MPa, 930-1260 MPa, 6.5-3.8 %, respectively. After aged at 450-650 ℃ for various times, the ultimate tensile strength, yielding strength and elongation of the alloy are in the range of 1180-1690 MPa, 1040-1520 MPa, 17.0-8.2 %, respectively. Being solution heated treatment at 1100℃/1 H, the microstructure of the alloy is a plate martenite phase belonging to the B.C.C. structure. In addition, some TiC carbides were found within the matrix. When aged at 450 ℃ for various times, some α-phase precipitates had been found. And, increasing the aging
temperature to 550℃, it can be observed that the L12 -type precipitates formed within the matrix. Age 650-750 ℃ for various times, the M23C6-type carbides and austenite phase formed.

並列關鍵字

Microstructure ； Precipitate hardening ； L12 ； Alloy design

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