真空脱氢对Sr变质ZL114A焊缝组织性能影响
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摘要
采用电感耦合法(ICP)、电子测氢仪、万能试验机、金相显微镜(OM)、扫描电镜(SEM)、能谱分析(EDS)与透射电镜(TEM)研究了真空脱氢对Sr变质ZL114A合金焊缝区域微观组织与力学性能的影响。结果表明:焊接副与焊丝经真空脱氢处理,氢含量由0.64×10~(-6)降至0.26×10~(-6),24与12 mm焊缝区域气泡数量分别降低71.4%与60%,气泡直径由2.3,1.8 mm降至1.4,1.2 mm,面密度各降低77.7%,81.8%。沿晶界均匀分布的共晶Si相经添加Sr元素后,形貌由针状转变为球状,颗粒尺寸由106降至12μm,12 mm焊缝区域平均抗拉强度、屈服强度、延伸率与断面收缩率分别为364 MPa,332 MPa,9.8%与14.2%。T6态微观组织主要由初生α-Al、初生及共晶Si相与Mg_2Si相组成,断口表面硬脆Si相颗粒直径约为4μm,Mg_2Si相呈长棒状,长宽比约为15.2,经真空脱氢处理,断口韧窝形貌由椭圆状过渡为球状,断裂机制由沿晶断裂演变为韧窝断裂。
The effect of vacuum dehydrogenation on microstructure and mechanical properties of ZL114A alloy modified by Sr nearbywelding region were analyzed by Electronic hydrogen measuring instrument, ICP, OM, SEM, EDS, TEM and Universal testing machine.The results show that after the vacuum dehydrogenation process the hydrogen content decreases from 0.64×10~(-6) to 0.26×10~(-6); in the 24 mmand 12 mm weld zone, the number of bubbles decreases by 71.4% and 60%, their diameter decreases from 2.3 and 1.8 to 1.4 and 1.2 mm,and the surface density is reduced by 77.7% and 81.8%, respectively. The morphology of silicon phase transforms from needle-like tospherical, the particle size decreases from 106 to 12 μm. the average tensile strength, yield strength, elongation and reduction of area with12 mm in thickness are 364 MPa, 332 MPa, 9.8% and 14.2%, respectively. The microstructure under T6 state mainly contains primaryα-Al, primary and eutectic Si phase and Mg_2Si aging phase, the diameter of brittle Si particle is 4 μm, Mg_2Si aging phase shows a rod-likemorphology and the aspect ratio is 15.2. The shape of dimple changes from elliptical to spherical and the fracture mechanism evolves fromintergranular fracture to dimple rupture after vacuum dehydrogenation.
The effect of vacuum dehydrogenation on microstructure and mechanical properties of ZL114A alloy modified by Sr nearbywelding region were analyzed by Electronic hydrogen measuring instrument, ICP, OM, SEM, EDS, TEM and Universal testing machine.The results show that after the vacuum dehydrogenation process the hydrogen content decreases from 0.64×10~(-6) to 0.26×10~(-6); in the 24 mmand 12 mm weld zone, the number of bubbles decreases by 71.4% and 60%, their diameter decreases from 2.3 and 1.8 to 1.4 and 1.2 mm,and the surface density is reduced by 77.7% and 81.8%, respectively. The morphology of silicon phase transforms from needle-like tospherical, the particle size decreases from 106 to 12 μm. the average tensile strength, yield strength, elongation and reduction of area with12 mm in thickness are 364 MPa, 332 MPa, 9.8% and 14.2%, respectively. The microstructure under T6 state mainly contains primaryα-Al, primary and eutectic Si phase and Mg_2Si aging phase, the diameter of brittle Si particle is 4 μm, Mg_2Si aging phase shows a rod-likemorphology and the aspect ratio is 15.2. The shape of dimple changes from elliptical to spherical and the fracture mechanism evolves fromintergranular fracture to dimple rupture after vacuum dehydrogenation.
引文
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[3]Wang Jianguo(王建国),Wang Zhutang(王祝堂).Light Alloy Fabrication Technology(轻合金加工技术)[J],2013,41(10):1
[4]Liao Hengcheng(廖恒成),Sun GuoXiong(孙国雄).The Chinese Journal of Nonferrous Metals(中国有色金属学报)[J],2003,13(2):353
[5]Jiang Wenming,Fan Zitian,Dai Yucheng et al.Mater Sci Eng A[J],2014,597:237
[6]Hu Xinping(胡心平),Xie Lingi(谢玲),Zhang Juan(张娟).Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2012,41(2):431
[7]Li Linxin(李林鑫),Yin Qiang(银强),Chen Xianjun(陈显均)et al.Foundry(铸造)[J],2016,65(7):608
[8]Yang Huaide(杨怀德),Long Siyuan(龙思远),Wu Mingfang(吴明放)et al.Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2015,44(3):621
[9]Dong Yun(董允),Lin Xiaoping(林小娉),Ye Jie(叶杰)et al.Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2013,42(12):2472
[10]Mousavi G S,Emamy M,Rassizadehghani J.Mater Sci Eng A[J],2012,556:573
[11]Wannasin J,Canyook R,Wisutmethangoon S et al.Acta Materialia[J],2013,61:3897
[12]Pourbahari B,Emamy M.Materials and Design[J],2016,94:111
[13]Yang Huaide(杨怀德),Long Siyuan(龙思远),Zhu Shuqing(朱姝晴)et al.Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2016,45(1):187
[14]Liu Zili(刘子利),Zhou Guibin(周桂斌),Liu Xiqin(刘希琴)et al.Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2013,42(1):99
[15]Shi Gang(石刚),Hu Lianxi(胡连喜),Wang Erde(王尔德).Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2006,35(4):609
[16]Jiang Qing(蒋清),Meng Xiangwei(孟祥炜),Xiao Wenfeng(肖文丰)et al.Hot Working Technology(热加工工艺)[J],2015(15):35
[17]Liao Hengcheng(廖恒成),Ding Yi(丁毅),Sun Guoxiong(孙国雄).Acta Metallurgica Sinica(金属学报)[J],2002,38(3):245
[18]Liu Fang,Yu Fuxiao,Zhang Yiling.Transactions of Nonferrous Metals Society of China[J],2012,22(8):1884
[19]Zhang Zhonghua(张忠华),Bian Xiufang(边秀房).Foundry(铸造)[J],1999(1):5
[20]Zuo Yubo(左玉波),Kang Yiyao(康轶瑶),Lin Yue(蔺玥)et al.The Chinese Journal of Nonferrous Metals(中国有色金属学报)[J],2016,26(3):486
[21]Lu Quanbin(路全彬),Long Weimin(龙伟民),Du Quanbin(杜全斌)et al.Electric Welding Machine(电焊机)[J],2016,46(4):55
[22]Ma Feng(马锋),Liang Wei(梁伟),Guo Kefeng(郭科峰).Welding Technology(焊接技术)[J],2016,45(6):33
[23]Shu Fuhua(舒服华),Liang Fang(梁芳).Special Cast and Nonferrous Alloys(特种铸造及有色合金)[J],2016,36(6):580
[24]Wu Xin(吴鑫),Qi Bojin(齐铂金),Zhang Jianhe(张健合).Journal of Beijing University of Aeronautics and Astronautics(北京航空航天大学学报)[J],2011,37(6):673
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