本文主要研究内容
作者王大宇（2019）在《Mg-Zn-Y-Zr镁合金变型腔液态模锻组织与性能研究》一文中研究指出：镁合金由于密度低、比强度高、储量大等优点受到广泛关注。目前镁合金的主要成形手段是压铸,但压铸件的性能较低,难以作为结构件使用。锻造加工虽然能有效提高镁合金制件性能,但由于镁合金的密排六方结构,室温变形困难,难以成型复杂制件。液态模锻是以铸造和模锻为基础,逐步发展起来的集两种工艺优点于一身的成形技术。既可以提高制件的性能,又能成形复杂零件。但液态模锻制件发生的塑性变形很小,其性能略低于锻件,为了进一步提高液态模锻制件的性能,本文在液态模锻技术的基础上采用活动型腔,进行变型腔液态模锻,加大塑性变形量,改善液锻件的组织和性能。本文通过液态模锻实验研究了Y元素对液态模锻Mg-Zn-Y-Zr镁合金组织性能的影响规律。研究表明:Y元素会造成成分过冷,从而起到细化晶粒的作用。当Y含量为1%（wt%）时,性能最佳,其抗拉强度为247.31MPa,伸长率为15.13%。设计制造了镁合金熔炼-充型-成形一体化输送装置。通过电控系统内部设定的PLC程序对镁液进行定量输送,最终完成金属液充型。进行了镁合金升液过程和充型过程数值模拟,结果表明升液过程中金属液上升平稳,卷气现象不明显,但温度下降很快,容易造成堵塞,需要添加保温装置;充型过程数值模拟结果表明,金属液充型过快容易卷气,产生流痕、气孔等缺陷,金属液充型较慢则造成金属液温度过低,不利于下一步实验,最终确定充型速度为20mm/s。基于液态模锻工艺和一体化输送装置进行了变型腔液态模锻实验,研究了不同变形温度对变型腔液态模锻的影响,揭示了变型腔液态模锻工艺对Mg-Zn-1%Y-Zr镁合金组织性能的影响规律。结果表明:经过变型腔液态模锻之后,原始枝晶组织被拉长,变形组织中存在大量的变形痕迹,沿变形方向铸态的枝晶基本消失,沿截面方向由于变形较少,仍存在明显的枝晶组织;合金中的第二相主要包括共晶的I相和W相以及微量的Mg-Zn二元相,在变型腔变形过程中合金中大部分第二相破碎成细小的第二相分布带,当变形温度为350℃时有少量条纹状第二相残留;合金的性能受第二相的形态和分布影响,当变形温度为350℃时,L型件具有最高的抗拉强度351.51 MPa和一定的伸长率3.92%;而变形温度为450℃时,该变形温度下的塑性最好,伸长率为7.15%。通过对变形温度为350℃的变型腔液态模锻制件进行热处理,研究其组织和力学性能的变化规律。经过固溶热处理后,合金组织发生了再结晶,晶粒得到了细化。合金中中I相完全溶解,W相大部分分解,由粗大的块状变成细小的颗粒状。在经过T6处理后,合金中W相完全分解,组织中析出了新的二元相Mg2Y以及大量棒状的Mg-Zn二元相,这些析出相弥散地分布在基体中,从而大大提高了合金的强度和塑性。整体上看,经过热处理后制件的强度略有所下降,但伸长率显著提升。对于本实验,T6处理是最合适的热处理方式,具体参数为475℃×3.5h+200℃×48h。进行了不同Y含量的变型腔液态模锻实验,研究随着Y含量增加,组织中第二相形貌、种类、分布的变化规律以及第二相与制件力学性能的内在联系。通过添加Y元素,合金中主要第二相由单一的Mg-Zn二元相,转变为三元相;随着Y含量继续增加,三元相遵从I相—W相—LPSO相的规律改变;同时晶界处的第二相含量也逐步增加,从5.30%增长到22.32%;三种三元相在变型腔液态模锻过程中对组织造成影响不同,I相与镁基体的界面结合较好,碎裂过程几乎没有微裂纹产生。W相容易形成粗大的网状结构,变形过程中难以完全碎裂,经常会有裂纹残留,对合金产生不利影响。LPSO相是长周期有序堆垛组织,一般呈片层状,厚度不大,变形过程中碎裂成细小的第二相。整体来看,当Y含量为1%时,L型件具有最高的抗拉强度351.51 MPa和一定的伸长率3.92%;当Y含量为4%时,该变形温度下的强度和塑性都很好,抗拉强度为350.65MPa,伸长率为5.71%。
Abstract
mei ge jin you yu mi du di 、bi jiang du gao 、chu liang da deng you dian shou dao an fan guan zhu 。mu qian mei ge jin de zhu yao cheng xing shou duan shi ya zhu ,dan ya zhu jian de xing neng jiao di ,nan yi zuo wei jie gou jian shi yong 。duan zao jia gong sui ran neng you xiao di gao mei ge jin zhi jian xing neng ,dan you yu mei ge jin de mi pai liu fang jie gou ,shi wen bian xing kun nan ,nan yi cheng xing fu za zhi jian 。ye tai mo duan shi yi zhu zao he mo duan wei ji chu ,zhu bu fa zhan qi lai de ji liang chong gong yi you dian yu yi shen de cheng xing ji shu 。ji ke yi di gao zhi jian de xing neng ,you neng cheng xing fu za ling jian 。dan ye tai mo duan zhi jian fa sheng de su xing bian xing hen xiao ,ji xing neng lve di yu duan jian ,wei le jin yi bu di gao ye tai mo duan zhi jian de xing neng ,ben wen zai ye tai mo duan ji shu de ji chu shang cai yong huo dong xing qiang ,jin hang bian xing qiang ye tai mo duan ,jia da su xing bian xing liang ,gai shan ye duan jian de zu zhi he xing neng 。ben wen tong guo ye tai mo duan shi yan yan jiu le Yyuan su dui ye tai mo duan Mg-Zn-Y-Zrmei ge jin zu zhi xing neng de ying xiang gui lv 。yan jiu biao ming :Yyuan su hui zao cheng cheng fen guo leng ,cong er qi dao xi hua jing li de zuo yong 。dang Yhan liang wei 1%（wt%）shi ,xing neng zui jia ,ji kang la jiang du wei 247.31MPa,shen chang lv wei 15.13%。she ji zhi zao le mei ge jin rong lian -chong xing -cheng xing yi ti hua shu song zhuang zhi 。tong guo dian kong ji tong nei bu she ding de PLCcheng xu dui mei ye jin hang ding liang shu song ,zui zhong wan cheng jin shu ye chong xing 。jin hang le mei ge jin sheng ye guo cheng he chong xing guo cheng shu zhi mo ni ,jie guo biao ming sheng ye guo cheng zhong jin shu ye shang sheng ping wen ,juan qi xian xiang bu ming xian ,dan wen du xia jiang hen kuai ,rong yi zao cheng du sai ,xu yao tian jia bao wen zhuang zhi ;chong xing guo cheng shu zhi mo ni jie guo biao ming ,jin shu ye chong xing guo kuai rong yi juan qi ,chan sheng liu hen 、qi kong deng que xian ,jin shu ye chong xing jiao man ze zao cheng jin shu ye wen du guo di ,bu li yu xia yi bu shi yan ,zui zhong que ding chong xing su du wei 20mm/s。ji yu ye tai mo duan gong yi he yi ti hua shu song zhuang zhi jin hang le bian xing qiang ye tai mo duan shi yan ,yan jiu le bu tong bian xing wen du dui bian xing qiang ye tai mo duan de ying xiang ,jie shi le bian xing qiang ye tai mo duan gong yi dui Mg-Zn-1%Y-Zrmei ge jin zu zhi xing neng de ying xiang gui lv 。jie guo biao ming :jing guo bian xing qiang ye tai mo duan zhi hou ,yuan shi zhi jing zu zhi bei la chang ,bian xing zu zhi zhong cun zai da liang de bian xing hen ji ,yan bian xing fang xiang zhu tai de zhi jing ji ben xiao shi ,yan jie mian fang xiang you yu bian xing jiao shao ,reng cun zai ming xian de zhi jing zu zhi ;ge jin zhong de di er xiang zhu yao bao gua gong jing de Ixiang he Wxiang yi ji wei liang de Mg-Zner yuan xiang ,zai bian xing qiang bian xing guo cheng zhong ge jin zhong da bu fen di er xiang po sui cheng xi xiao de di er xiang fen bu dai ,dang bian xing wen du wei 350℃shi you shao liang tiao wen zhuang di er xiang can liu ;ge jin de xing neng shou di er xiang de xing tai he fen bu ying xiang ,dang bian xing wen du wei 350℃shi ,Lxing jian ju you zui gao de kang la jiang du 351.51 MPahe yi ding de shen chang lv 3.92%;er bian xing wen du wei 450℃shi ,gai bian xing wen du xia de su xing zui hao ,shen chang lv wei 7.15%。tong guo dui bian xing wen du wei 350℃de bian xing qiang ye tai mo duan zhi jian jin hang re chu li ,yan jiu ji zu zhi he li xue xing neng de bian hua gui lv 。jing guo gu rong re chu li hou ,ge jin zu zhi fa sheng le zai jie jing ,jing li de dao le xi hua 。ge jin zhong zhong Ixiang wan quan rong jie ,Wxiang da bu fen fen jie ,you cu da de kuai zhuang bian cheng xi xiao de ke li zhuang 。zai jing guo T6chu li hou ,ge jin zhong Wxiang wan quan fen jie ,zu zhi zhong xi chu le xin de er yuan xiang Mg2Yyi ji da liang bang zhuang de Mg-Zner yuan xiang ,zhe xie xi chu xiang mi san de fen bu zai ji ti zhong ,cong er da da di gao le ge jin de jiang du he su xing 。zheng ti shang kan ,jing guo re chu li hou zhi jian de jiang du lve you suo xia jiang ,dan shen chang lv xian zhe di sheng 。dui yu ben shi yan ,T6chu li shi zui ge kuo de re chu li fang shi ,ju ti can shu wei 475℃×3.5h+200℃×48h。jin hang le bu tong Yhan liang de bian xing qiang ye tai mo duan shi yan ,yan jiu sui zhao Yhan liang zeng jia ,zu zhi zhong di er xiang xing mao 、chong lei 、fen bu de bian hua gui lv yi ji di er xiang yu zhi jian li xue xing neng de nei zai lian ji 。tong guo tian jia Yyuan su ,ge jin zhong zhu yao di er xiang you chan yi de Mg-Zner yuan xiang ,zhuai bian wei san yuan xiang ;sui zhao Yhan liang ji xu zeng jia ,san yuan xiang zun cong Ixiang —Wxiang —LPSOxiang de gui lv gai bian ;tong shi jing jie chu de di er xiang han liang ye zhu bu zeng jia ,cong 5.30%zeng chang dao 22.32%;san chong san yuan xiang zai bian xing qiang ye tai mo duan guo cheng zhong dui zu zhi zao cheng ying xiang bu tong ,Ixiang yu mei ji ti de jie mian jie ge jiao hao ,sui lie guo cheng ji hu mei you wei lie wen chan sheng 。Wxiang rong yi xing cheng cu da de wang zhuang jie gou ,bian xing guo cheng zhong nan yi wan quan sui lie ,jing chang hui you lie wen can liu ,dui ge jin chan sheng bu li ying xiang 。LPSOxiang shi chang zhou ji you xu dui duo zu zhi ,yi ban cheng pian ceng zhuang ,hou du bu da ,bian xing guo cheng zhong sui lie cheng xi xiao de di er xiang 。zheng ti lai kan ,dang Yhan liang wei 1%shi ,Lxing jian ju you zui gao de kang la jiang du 351.51 MPahe yi ding de shen chang lv 3.92%;dang Yhan liang wei 4%shi ,gai bian xing wen du xia de jiang du he su xing dou hen hao ,kang la jiang du wei 350.65MPa,shen chang lv wei 5.71%。
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论文作者分别是来自哈尔滨工业大学的王大宇，发表于刊物哈尔滨工业大学2019-12-07论文，是一篇关于镁合金论文,变型腔论文,液态模锻论文,变形温度论文,力学性能论文,哈尔滨工业大学2019-12-07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，资料来自哈尔滨工业大学2019-12-07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：镁合金论文; 变型腔论文; 液态模锻论文; 变形温度论文; 力学性能论文; 哈尔滨工业大学2019-12-07论文;