本文主要研究内容
作者贾红帅（2019）在《2.25Cr1Mo大锻件热加工工艺模拟研究》一文中研究指出：随着环境污染与能源枯竭等问题日益凸显,核电作为高效、清洁能源逐渐受到人们关注,满足当今时代绿色发展要求。被誉为“核电之肺”的蒸汽发生器作为核电站中最为关键的构件,起着至关重要的作用,由于蒸汽发生器需长期处于高温、高压和液态钠的环境下服役,这就对蒸汽发生器用钢提出更高要求。蒸汽发生器作为大锻件典型代表之一,在锻造与热处理工艺上提出较高限制要求。本文以蒸汽发生器实验研发为背景,以快堆蒸汽发生器用2.25Cr1Mo钢(SA-336F22)大锻件加工为基础,基于Simufact-forming有限元软件模拟大锻件实际锻造与热处理工艺,通过研究得到以下结论:根据有限元仿真模拟,构建2.25Cr1Mo钢有限元模型,包括物理冶金模型及组织相变模型;建立本构方程,临界应变,动态再结晶分数等数学模型,为后续大锻件模拟仿真提供了夯实基础。基于Simufact-forming锻造工艺模块,探究坯料镦拔工艺对晶粒尺寸的影响,并对坯料心部位置进行质点追踪,发现二镦二拔工艺比一镦一拔工艺更有利于坯料心部晶粒细化。对蒸汽发生器锻造过程进行预镦粗与锻造成型工艺仿真模拟,探究不同温度、不同压下量、不同压下速率对大锻件晶粒尺寸的影响规律,根据模拟结果可知,在模拟边界条件范围内,对于2.25Cr1Mo钢蒸汽发生器大锻件采用高温(1250℃)、大应变速率(400 mm/s)、大压下量(1220 mm)更有利于心部晶粒细化,提高大锻件性能。在热处理工艺下,模拟大锻件在不同冷却介质下组织变化规律,根据结果可知:大锻件受到尺寸与淬透性限制,在背离“管嘴”、距底部壁厚二分之一处为难温降区域,受到冷却介质影响较小。对于蒸汽发生器大锻件,水冷工艺下难以得到以贝氏体为主的组织,在实际生产中应提高冷却效率,保证组织均匀性。针对实际生产大锻件高温拉伸性能不达标等问题,基于拉森-米勒公式进行计算推导,得到在调整回火温度后,焊后热处理时间可由16 h调整为21.5 h~26h进行,满足试验设计要求。模拟结果与实际试验结果一致,仿真结果真实可靠。
Abstract
sui zhao huan jing wu ran yu neng yuan ku jie deng wen ti ri yi tu xian ,he dian zuo wei gao xiao 、qing jie neng yuan zhu jian shou dao ren men guan zhu ,man zu dang jin shi dai lu se fa zhan yao qiu 。bei yu wei “he dian zhi fei ”de zheng qi fa sheng qi zuo wei he dian zhan zhong zui wei guan jian de gou jian ,qi zhao zhi guan chong yao de zuo yong ,you yu zheng qi fa sheng qi xu chang ji chu yu gao wen 、gao ya he ye tai na de huan jing xia fu yi ,zhe jiu dui zheng qi fa sheng qi yong gang di chu geng gao yao qiu 。zheng qi fa sheng qi zuo wei da duan jian dian xing dai biao zhi yi ,zai duan zao yu re chu li gong yi shang di chu jiao gao xian zhi yao qiu 。ben wen yi zheng qi fa sheng qi shi yan yan fa wei bei jing ,yi kuai dui zheng qi fa sheng qi yong 2.25Cr1Mogang (SA-336F22)da duan jian jia gong wei ji chu ,ji yu Simufact-formingyou xian yuan ruan jian mo ni da duan jian shi ji duan zao yu re chu li gong yi ,tong guo yan jiu de dao yi xia jie lun :gen ju you xian yuan fang zhen mo ni ,gou jian 2.25Cr1Mogang you xian yuan mo xing ,bao gua wu li ye jin mo xing ji zu zhi xiang bian mo xing ;jian li ben gou fang cheng ,lin jie ying bian ,dong tai zai jie jing fen shu deng shu xue mo xing ,wei hou xu da duan jian mo ni fang zhen di gong le ben shi ji chu 。ji yu Simufact-formingduan zao gong yi mo kuai ,tan jiu pi liao dui ba gong yi dui jing li che cun de ying xiang ,bing dui pi liao xin bu wei zhi jin hang zhi dian zhui zong ,fa xian er dui er ba gong yi bi yi dui yi ba gong yi geng you li yu pi liao xin bu jing li xi hua 。dui zheng qi fa sheng qi duan zao guo cheng jin hang yu dui cu yu duan zao cheng xing gong yi fang zhen mo ni ,tan jiu bu tong wen du 、bu tong ya xia liang 、bu tong ya xia su lv dui da duan jian jing li che cun de ying xiang gui lv ,gen ju mo ni jie guo ke zhi ,zai mo ni bian jie tiao jian fan wei nei ,dui yu 2.25Cr1Mogang zheng qi fa sheng qi da duan jian cai yong gao wen (1250℃)、da ying bian su lv (400 mm/s)、da ya xia liang (1220 mm)geng you li yu xin bu jing li xi hua ,di gao da duan jian xing neng 。zai re chu li gong yi xia ,mo ni da duan jian zai bu tong leng que jie zhi xia zu zhi bian hua gui lv ,gen ju jie guo ke zhi :da duan jian shou dao che cun yu cui tou xing xian zhi ,zai bei li “guan zui ”、ju de bu bi hou er fen zhi yi chu wei nan wen jiang ou yu ,shou dao leng que jie zhi ying xiang jiao xiao 。dui yu zheng qi fa sheng qi da duan jian ,shui leng gong yi xia nan yi de dao yi bei shi ti wei zhu de zu zhi ,zai shi ji sheng chan zhong ying di gao leng que xiao lv ,bao zheng zu zhi jun yun xing 。zhen dui shi ji sheng chan da duan jian gao wen la shen xing neng bu da biao deng wen ti ,ji yu la sen -mi le gong shi jin hang ji suan tui dao ,de dao zai diao zheng hui huo wen du hou ,han hou re chu li shi jian ke you 16 hdiao zheng wei 21.5 h~26hjin hang ,man zu shi yan she ji yao qiu 。mo ni jie guo yu shi ji shi yan jie guo yi zhi ,fang zhen jie guo zhen shi ke kao 。
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论文详细介绍
论文作者分别是来自辽宁科技大学的贾红帅，发表于刊物辽宁科技大学2019-11-25论文，是一篇关于大锻件论文,有限元仿真论文,锻造论文,热处理论文,辽宁科技大学2019-11-25论文的文章。本文可供学术参考使用，各位学者可以免费参考阅读下载，文章观点不代表本站观点，资料来自辽宁科技大学2019-11-25论文网站，若本站收录的文献无意侵犯了您的著作版权，请联系我们删除。
标签：大锻件论文; 有限元仿真论文; 锻造论文; 热处理论文; 辽宁科技大学2019-11-25论文;