Transactions of Materials and Heat Treatment

Title：Evolution of mixed grain structure on thermal deformation of 2.25Cr1Mo0.25V heavy steel ingot

Authors： Su Jinhu Li Yucai Deng Hai

Unit： JiaoZuo Creation Machinery Co. Ltd.

KeyWords： 2.25Cr1Mo0.25V heavy steel ingot thermal deformation mixed grain struture

ClassificationCode：TG156.1;TG115.21

year,vol(issue):pagenumber：2014,39(2):17-22

Abstract：

Referring to the actual thermal deformation process，the high-temperature homogenization treatment and hot upsetting experiment for 2.25Cr1Mo0.25V steel ingot were conducted. The influence of hot deformation conditions on high temperature mechanical behavior and coarse-grained tissue was studied, and the optimal thermaldynamic parameters were obtained. Then the mixed crystal phenomenon in actual process was mainly judged and analyzed，and the corresponding precautions were put forward. The results show that for the 2.25Cr1Mo0.25V steel ingot used for hydrogenation reactor,the optimal thermal deformation parameters are deformation of 20%, deformation temperature of 1150 ℃ and strain rate of 0.1 s-1. Meanwhile，the Dmax/D0 is 3.1, D0 is 27-36μm and Dmax is 99-136μm.With the increasing of deformation temperatures and extension of deformation time, the mixed crystals gradually disappear.

Funds：

国家科技重大专项资助项目“高档数控机床与基础制造装备”（2009ZX04014-062）

苏金虎（1985-），男,硕士，助理工程师

Reference：

［1］郭会光,曲宗实. 我国大锻件制造业的发展[J]. 大型铸锻件, 2003,(1):42-45. Guo Huiguang,Qu Zongshi. The development of Chinese large forgings production[J]. Heavy Casting and Forging, 2003,(1):42-45.
［2］ Nili-Ahmadabadi M, Mosallaiee-Pour M.Homogenization of ductile iron using partial molting aided by modeling[J].Mater. Sci. Eng. A,2004,373(1-2):309-314.
［3］Gandian C A.Modeling of precipitate-free zone formed upon homogenization in a multi-component alloy[J].Acta Mater.,2007,55(7):2539-2553.
［4］邓林涛，刘志颖，王涛，等.1000 MW核电管板纯净钢锻件制造工艺及其性能[J]. 中国核电,2009,2(2): 126-132.Deng Lintao,Liu Zhiying,Wang Tao,et al. The manufacturing technology and properties on 1000 MW tube sheet clean steel[J]. China Nuclear Power,2009,2(2): 126-132.
［5］金泉林.大型汽轮机低压转子混晶缺陷预防工艺措施研究[J].锻压技术,2012,37(4):8-13.Jin Quanlin.The research of heavy LP rotor on preventing mischcrystal defect [J].Forging & Stamping Technology, 2012,37(4):8-13.
［6］向可,赵学智,夏琴香,等.长轴类大锻件锻前加热工艺的研究[J].热加工工艺,2011,40(3):78-81.Xiang Ke,Zhao Xuezhi,Xia Qinxiang,et al. The research of heating process before forged for shaft large forging[J]. Hot Working Technology,2011,40(3):78-81.
［7］孙东立,姜石峰,高兴锡.均匀化处理对3004铝合金显微组织的影响[J].中国有色金属学报,1999,9(3):556-561. Sun Dongli,Jiang Shifeng,Gao Xingxi.The influence of homogenizing treatment on microstructure of 3004 aluminum alloy[J].The Chinese Journal of Nonferrous Metals,1999,9(3):556-561.
［8］刘鑫刚. 大型锻件高温扩散的理论与实验研究[D].秦皇岛：燕山大学，2004.Liu Xingang.The Study of High Temperature Diffusion in Large Forgings[D].Qinhuangdao:Yanshan University，2004.
［9］常铁军，马茂元. 钢的混晶程度评价方法探讨[J]. 哈尔滨船舶工程学院，1989,25(1):40-41. Chang Tiejun，Ma Maoyuan.The study for steel mixed crystal degree evaluation method[J]. Harbin Engineering University,1989,25(1):40-41.
［10］宗云,赵莉萍,麻永林,等.X60钢在CSP热轧过程中的组织演变与混晶现象[J].上海金属,2006,28(2):43-47.Zong Yun,Zhao Liping,Ma Yonglin,et al.Microstructure evolution and mixed grains phenomenon of X60 steel during hot rolling in CSP[J]. Shanghai Metals,2006,28(2):43-47.

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