臺灣博碩士論文加值系統

17-4析出硬化型不鏽鋼具有麻田散鐵型不鏽鋼的強度與沃斯田鐵型不鏽鋼的耐腐蝕性，可藉由固溶及時效處理，達到析出強化效果。且因其具有良好的強度、韌性、耐蝕性、與焊接性，已被廣泛應用於航太等工業之零組件。
17-4PH不繡鋼作為焊接材時，鑄錠一般是經均質化、固溶後，才進行焊接作業，焊後再施以時效處理。本研究擬藉由探討真空鑄造及大氣鑄造之17-4PH不繡鋼焊接處理前、焊接後微結構及機械性質，以評估鑄造製程（真空鑄造及大氣鑄造）對於17-4PH不鏽鋼焊件性質之影響。另一方面，實驗中也進行了模擬焊接熱處理實驗，期能藉由熱處理來呈現焊件的微結構與機械性質。
鑄錠依照焊件不同區域（即母材、熱影響區及焊道）的狀況施以相對應的模擬焊件之熱處理，其程序分別如下，1.母材區之模擬：鑄錠施以均質化、固溶後空冷及時效處理。2.熱影響區之模擬：鑄錠施以均質化、固溶後，快速『重升溫』到800℃～1300℃、持溫5min後淬火再施以時效處理。3.焊道區模擬：鑄錠施以時效處理。
結果顯示鑄造製程（真空鑄造及大氣鑄造）對17-4PH不鏽鋼的微結構與機械性質影響極為微小，影響17-4不繡鋼焊件性質的主要因素是熱處理製程的差異。另外模擬焊接熱處理實驗能有效且真實的模擬實際焊件之微結構與機械性質。

17-4PH martensitic stainless steel can strength by solid solution and aging treatment , to precipitation hardening effect. And it has excellent strength, toughness, corrosion resistance and weldability. It has been widely used in aerospace and other industrial. This study intends to investigate the vacuum casting and atmosphere casting of 17-4PH stainless steel, two kind of process. What’s the different about microstructure and mechanical properties after and before welding. On the other hand , the experiment also simulated weld heat treatment experiments , can be heat-treated to render on the microstructure and mechanical properties of weldments. The results showed that the casting process ( vacuum casting and atmospheric casting ) microstructure and mechanical properties of the impact on the 17-4PH stainless steel is extremely small , the main factors are heat treatment processes. Another experiment simulated weld heat treatment can be effective and realistic simulation of the actual microstructure and mechanical properties of weldments .

總目錄
摘要……………………………………………………………...……….I
總目錄…………………………………………………………….……III
圖目錄…………………………………………………………...………V
表目錄……………………………………...…………………………VIII
一、 文獻回顧……………………………………………………….1
1.1 不鏽鋼簡介…………………………………………………….1
1.1.1 肥粒鐵系不鏽鋼…………………………………………...4
1.1.2 麻田散鐵系不鏽鋼………………………………………...5
1.1.3 沃斯田鐵系不鏽鋼………………………………………...6
1.1.4 雙相系不鏽鋼……………………………………………...7
1.1.5 析出硬化系不鏽鋼………………………………………...9
1.2 17-4PH不鏽鋼………………………………………………….9
1.3 焊接對17-4PH不鏽鋼的影響………………………………...10
1.4 熱處理對17-4PH不鏽鋼的影響……………………………...13
1.5 研究目的……………………………………………………...17
二、 實驗步驟與方法………………………………………………18
2.1合金熔配……………………………………………………….19
2.2焊接與模擬前熱處理………………………………………….20
2.3雷射焊接……………………………………………………….20
2.4熱處理模擬焊接……………………………………………….21
2.5氮氧含量分析…………………………………………………22
2.6微結構分析……………………………………………………22
2.7機械性質分析………………………………………………….23
三、 結果與討論……………………………………………………24
3.1鑄件之氮氧含量分析…………………………………………..24
3.2微結構分析……………………………………………………..24
3.2.1時效前母材與焊道微結構之模擬………………………...25
3.2.1.1鑄態微結構與氣孔（模擬焊道）…………..………25
3.2.1.2均質化微結構………………………………………27
3.2.1.3固溶處理微結構……………………………………29
3.2.2時效前熱影響區微結構之模擬…………………………..30
3.2.3.時效後微結構之模擬（焊道、熱影響區、母材）……..31
3.2.4實務焊件微結構…………………………………………..36
3.3機械性質分析………………………………………………….39
3.3.1模擬焊接熱處理對合金機械性質之影響………………..39
3.3.1.1熱處理後未時效合金之硬度分析…………………39
3.3.1.2 熱處理後時效處理合金之硬度測試……………..41
3.3.1.3模擬焊接熱處理後時效之拉伸性質分析………...42
3.3.2實務焊接的機械性質……………………………………..45
3.3.2.1焊件未時效之硬度分析……………………………45
3.3.2.2焊件時效後之硬度分析……………………………45
3.3.2.3焊件時效前、與時效後之彎曲試驗………………46
四、 結論……………………………………………………………49
五、 參考文獻………………………………………………………51
六、 附錄……………………………………………………………54

[POT]D.L. Potts ,J.G. Gensure, “ International Metallic Materials Cross-Reference”, Genium Publishing, 1989, p.256
[DAV]J.R. Davis, “Metals Handbook, 10th Ed., Vol. 1”, ASM International, 1990, p. 930
[DAV1] J.R. Davis, “ASM Specialty Handbook: Stainless Steel”, ASM International, 1994, p5
[PEC]D. Peckner, I.M. Bernstein, “Handbook of Stainless Steel”, McGraw-Hill, Inc., 1977, p1
[SCH]A.L. Schaeffler, “Constitution Diagram for Stainless Steel Weld Metal”, Met.Prog., Vol56, 1949, p.680
[DEL]W.T. DeLong, “Ferrite in Austenitic Stainless Steel Weld Metal”, Weld. J., Vol53, 1974, p.273
[PRA]M. prager, “Cast High Alloy Metallurgy: Steel Casting Metallurgy”, J. Svoboda, Ed., Steel Founders’ Society of America, 1984, p.221
[PIC]F. B. Pickering, “Physical Metallurgy of Stainless Steel Developments,” International Metals Reviews, Vol. 21, 1976, pp.227-268.
[LUL]R. Lula, Ed., “Stainless Steel”, American Society for Metals, 1986, p.56
[NOV]C.J. Novak, “Structure and Constitution of Wrought Austenitic Stainless Steel: Handbook of Stainless Steel”, McGraw-Hill, 1977, p4
[THO]S.R. Thomas, G. Krauss, Cyclic Martensitic Transformation and the Structure of a Commercial 18Cr-8Ni Stainless Steel, Vol239,1967, p.1136
[ANT]K.C. Anthony, “Aging Reaction in Precipitation Hardenable Stainless Steel”, J. Met, Vol15, 1963, pp.922-927
[VIS]U. K. Viswanathan, S. Banerjee, R. Krishnan, “Effect of Aging on the Microstructure of 17-4 PH Stainless Steel,” Materials Science and Engineering, Vol. A104, 1988, pp. 181-189.
[VIS1]U. K. Viswanathan, P. K. K. Nayar, R. Krishnan, “Kinetics of Precipitation in 17-4 PH Stainless Steel,” Materials Science and Technology, Vol. 5, 1989, pp. 346-349.
[HSI]C. N. Hsiao, C. S. Chiou, and J. R. Yang, “Aging reactions in a 17-4 PH Stainless Steel,” Materials ChemistRmax and Physics, Vol. 74, 2002, pp. 134-142.
[SMI]W. F. Smith, Structure and Properties of Engineering Alloys, 2nd Ed.,McGraw-Hill, Inc., 1993, p54
[FEI]J. Feinstein, Praxair,Inc., private communication, 1994
[STR]M.A. Streicher, New Stainless Steel for the Process and Power Industries, Metal Progress, 1985, pp.29-42
[STE]D. M. Stefanescu, ASM Handbook: Volume 15: Casting, ASM International,1988, p.20
[DEL1]W.T.DeLong, Ferrite in Austenitic Stainless Steel Weld Metal, Met. Prog, Vol 56(No.11), 1949, pp.680-681
[SIE]T.A.Siewert, C.N. McCiwan, and D.L. Olson, Ferrite Number Prediction to 100FN in Stainless Steel Weld Metal, Weld. J, Vol 53(No.7), 1947, pp289-298.
[TSE] K.H. Tseng, C.P. Chou, “The study of nitrogen in argon gas on the angular distortion of austenitic stainless steel weldments”, Journal of Materials Processing Technology, 2003,pp. 139–144.
[YUN] Yunxin Wu, R. M. German, D. Blaine, B. Marx, C. Schlaefer, “Effects of Residual Carbon Content on Sintering Shrinkage, Microstructure and Mechanical Properties of Injection Molded 17-4 PH Stainless Steel”, Journal of Materials Science, 2002,pp. 3573 – 3583.
[XIN]Xin Lin, Yongqing Cao, Xiaoyu Wu, Haiou Yang, Jing Chen, Weidong Huang,” Microstructure and Mechanical Properties of Laser Forming Repaired 17-4PH Stainless Steel”, Materials Science and Engineering A 553 ,2012, pp.80– 88.