Transactions of Materials and Heat Treatment

Title：umerical simulation of upsetting process for alloy 690 cast ingot and forged billet

Authors： Wang Jue1 2 Mei Ying2

Unit： 1. Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology 2.Nanjing Institute of Technology

KeyWords： upsetting hexagonal grains alloy 690 numerical simulation

ClassificationCode：

year,vol(issue):pagenumber：2015,40(10):5-11

Abstract：

True stress-true strain curves of alloys 690 with coarse columnar grains and hexagonal grains were obtained by hot compression tests and implemented into the finite element (FE) simulator. The upsetting processes of the two alloys were simulated by FE software Deform. The influences of original organizations of both cast ingot and forged billet on calculated maximum load during upsetting process were compared. The results show that dynamic recrystallization (DRX) appears during the compression tests of the two alloys 690 with different initial microstructures. DRX fraction is larger in forged billet than in cast ingot under the same deformation parameters. In the numerical simulation, the maximum load increases with the rise of forging speed and reduction of preheating temperature, and is generally larger in cast ingot alloy. Furthermore, the disparities of strain rate sensitivity factors at various temperatures of the two alloys result in the different regularities of the maximum load with the changing forging parameters.

Funds：

国家自然科学基金青年科学基金资助项目（513010 85）; 南京工程学院引进人才科研启动基金项目（YKJ201305）

王珏（1985-），男，博士，讲师

Reference：

[1]Wang J, Dong J X, Zhang M C, et al. Hot working characteristics of nickel-base superalloy 740H during compression[J]. Materials Science and Engineering A, 2013, 566: 61-70.

[2]Venkatesh V, Rack H J. Elevated temperature hardening of INCONEL 690[J] Mechanics of Materials, 1998，30: 69-81.

[3]Wang L, Liu F, Cheng J J, et al. Hot deformation characteristics and process map analysis for nickel-based corrosion resistant alloy[J]. Journal of Alloys and Compounds, 2015, 623: 69-78.

[4]Bi Z N, Zhang M C, Dong J X, et al. A new prediction model of steady state stress based on the influence of the chemical composition for nickel-base superalloys[J]. Materials Science and Engineering A, 2010, 527: 4373-4382.

[5]Semiatin S L, Weaver D S, Fagin P N, et al. Deformation and recrystallization behavior during hot working of a coarse-grain, nickel-base superalloy ingot material[J] Metallurgical and Materials Transactions A, 2004, 35A: 679-693.

[6]Weaver D S, Semiatin S L. Recrysallization and grain-growth behavior of a nickel-base superalloy during multi-hit deformation[J]. Scripta Materialia, 2007, 57: 1044-1047.

[7]杨亮, 董建新, 张麦仓. 690合金高温变形行为与动态再结晶模型[J]. 稀有金属材料与工程, 2012, 41(4): 727-732.Yang L, Dong J X, Zhang M C. Deformation behavior and dynamic recrystallization model for 690 alloy at elevated temperature[J]. Rare Metal Materials and Engineering, 2012, 41(4): 727-732.

[8]Prasad Y V R K, Srinivasan N. Hot working characteristics of nimonic75, 80A and 90 superalloys: a comparison using processing maps[J]. Journal of Materials Processing Technology, 1995, 51: 171-192.

[9]Jafari M, Najafizadeh A. Correlation between Zener-Hollomon parameter and necklace DRX during hot deformation of 316 stainless steel[J]. Materials Science and Engineering A, 2009, 501: 16-25.

[10]Jonas J J, Quelennec X, Jinag L, et al. The Avrami kinetics of dynamic recrystallization[J]. Acta Materialia, 2009, 57: 2748-2756.

[11]东赟鹏, 王超渊, 宋晓俊，等. GH5188合金流变行为研究[J]. 锻压技术, 2013, 38(6): 116-121.

Dong Y P, Wang C Y, Song X J, et al. Study on plastic deformation behavior of GH5188 superalloy[J]. Forging & Stamping Technology, 2013, 38(6): 116-121.

Service：

【This site has not yet opened Download Service】【Add Favorite】