Ni对金属粉芯型焊丝接头性能的影响
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摘要
为了制备WQ960高强钢焊接所需的药芯焊丝,自行研制了Mn-Mo-Cr系金属粉芯型药芯焊丝,并在药芯中添加Ni粉来改善焊接接头的冲击韧性.利用拉伸试验、硬度试验和冲击试验等测试方法研究了Ni元素对焊接接头力学性能的影响.结合组织观察和化学成分分析方法,从组织结构的角度对Ni元素的影响机理进行了合理解释.结果表明,随着焊缝中Ni含量的增加,焊接接头的抗拉强度增大,但伸长率减小.当温度为-60~25℃时,焊缝冲击功呈现先增大后降低的趋势.随着Ni含量的增加,焊缝及热影响区硬度增大,焊缝最高硬度值为329. 5 HV,热影响区软化现象有所缓解.焊缝金属中加入适量的Ni元素具有提高焊接接头冲击功的作用,且最佳Ni含量为1. 22%.
In order to fabricate the flux cored wire required in welding the WQ960 high strength steel,the Mn-Mo-Cr system metal powder flux cored wire was self-developed,and the Ni powder was added into the flux core to improve the impact toughness of welded joint. The effect of Ni element on the mechanical properties of welded joint was studied through performing the tensile test,hardness test and impact test.Combined with both microstructure observation and chemical composition analysis,the effect mechanism was reasonably explained from the perspective of microstructure. The results showthat with increasing the Ni content in the weld line,the ultimate tensile strength of welded joint increases,but the elongation decreases.When the temperature is in the range from-60 ℃ to 25 ℃,the impact energy of weld line firstly increases and then decreases. With increasing the Ni content,the hardness of both weld line and heat affect zone increases,and the maximum hardness value of weld line is 329. 5 HV. Meanwhile,the softening phenomenon of heat affected zone gets alleviated. It shows that the addition of suitable amount of Ni element into the weld metal plays a role of increasing the impact energy of welded joint,and the optimum addition amount of Ni is 1. 22%.
In order to fabricate the flux cored wire required in welding the WQ960 high strength steel,the Mn-Mo-Cr system metal powder flux cored wire was self-developed,and the Ni powder was added into the flux core to improve the impact toughness of welded joint. The effect of Ni element on the mechanical properties of welded joint was studied through performing the tensile test,hardness test and impact test.Combined with both microstructure observation and chemical composition analysis,the effect mechanism was reasonably explained from the perspective of microstructure. The results showthat with increasing the Ni content in the weld line,the ultimate tensile strength of welded joint increases,but the elongation decreases.When the temperature is in the range from-60 ℃ to 25 ℃,the impact energy of weld line firstly increases and then decreases. With increasing the Ni content,the hardness of both weld line and heat affect zone increases,and the maximum hardness value of weld line is 329. 5 HV. Meanwhile,the softening phenomenon of heat affected zone gets alleviated. It shows that the addition of suitable amount of Ni element into the weld metal plays a role of increasing the impact energy of welded joint,and the optimum addition amount of Ni is 1. 22%.
引文
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[7]王皇,刘海云,王宝,等.金属粉芯型药芯焊丝熔滴过渡及飞溅观察分析[J].焊接学报,2012,33(10):83-85.(WANG Huang,LIU Hai-yun,WANG Bao,et al. Observation and analysis of droplet transfer and spatter of metal pow der type of flux-cored w ire w elding[J].Transactions of the China Welding Institution,2012,33(10):83-85.)
[8]吕彦,余圣莆,行舒乐,等.钼、镍含量对马氏体不锈钢硬面药芯焊丝堆焊层组织和性能的影响[J].机械工程材料,2013,37(9):29-32.(LYan,YU Sheng-pu,Xing Shu-le,et al. Effect of M o and Ni contents on microstructure and properties of deposited metal prepared by martensitic stainless hard-facing flux-cored w ire[J]. M aterials for M echanical Engineering,2013,37(9):29-32.)
[9]王俊山,史培阳,刘承军,等.镍含量对高强耐候钢组织与性能的影响[J].材料与冶金学报,2015,14(2):135-138.(WANG Jun-shan,SHI Pei-yang,LIU Cheng-jun,et al. Effect of Ni contents on structure and properties of high strength w eathering resistant steel[J]. Journal of M aterials and M etallurgy,2015,14(2):135-138.)
[10]薛飞飞,张英乔,孟庆润,等.镍、铬对高强钢金属粉芯型药芯焊丝熔敷金属组织与性能的影响[J].电焊机,2014,44(5):89-92.(XUE Fei-fei,ZHANG Ying-qiao,MENG Qing-run,et al. Effect of Ni and Cr on the microstructure and properties of deposited metal w ith metal cored w ire of high strength steel[J]. Electric Welding M achine,2014,44(5):89-92.)
[2]邱克强,胡冰,任鹤,等.低合金高强钢KMN焊接接头的低温性能[J].沈阳工业大学学报,2015,37(6):634-638.(QIU Ke-qiang,HU Bing,REN He,et al. Lowtemperature properties of w elded joints of KM N HSLA steel[J]. Journal of Shenyang University of Technology,2015,37(6):634-638.)
[3]王立军,蔡庆伍,余伟,等. 1 500 MPa级低合金超高强钢的微观组织与力学性能[J].金属学报,2010,46(6):687-694.(WANG Li-jun,CAI Qing-wu,YU Wei,et al. Microstructure and mechanical properties of 1 500 M Pa grade ultra-high strength low alloy steel[J]. Acta M etallurgica Sinica,2010,46(6):687-694.)
[4]刘玉双,张亚平,吕奎清,等. 550 MPa级低合金钢用药芯焊丝的研制[J].焊接技术,2014,43(10):64-66.(LIU Yu-shuang,ZHANG Ya-ping,LKui-qing,et al. Development of flux cored w ire for 550 M Pa high strength low alloy steel[J]. Welding technology,2014,43(10):64-66.)
[5]孟庆润,吕奎清,杨宗全,等. 850 MPa级高强钢金属粉芯药芯焊丝E85C-K4的研制[J].材料开发与应用,2015,30(1):58-61.(MENG Qing-run,LKui-qing,YANG Zong-quan,et al. Development of 850 M Pa grade high strength steel metal cored flux cored w ire E85C-K4[J]. Development and Application of M aterials,2015,30(1):58-61.)
[6]宋峰雨,李艳梅,王平,等.热输入量对一种新型药芯焊丝熔敷金属组织及冲击韧性的影响[J].金属学报,2016,52(7):890-896.(SONG Feng-yu,LI Yan-mei,WANG Ping,et al.Effect of heat input on the microstructure and impact toughness of w eld metal processed by a new flux cored w ire w eld[J]. Acta M etallurgica Sinica,2016,52(7):890-896.)
[7]王皇,刘海云,王宝,等.金属粉芯型药芯焊丝熔滴过渡及飞溅观察分析[J].焊接学报,2012,33(10):83-85.(WANG Huang,LIU Hai-yun,WANG Bao,et al. Observation and analysis of droplet transfer and spatter of metal pow der type of flux-cored w ire w elding[J].Transactions of the China Welding Institution,2012,33(10):83-85.)
[8]吕彦,余圣莆,行舒乐,等.钼、镍含量对马氏体不锈钢硬面药芯焊丝堆焊层组织和性能的影响[J].机械工程材料,2013,37(9):29-32.(LYan,YU Sheng-pu,Xing Shu-le,et al. Effect of M o and Ni contents on microstructure and properties of deposited metal prepared by martensitic stainless hard-facing flux-cored w ire[J]. M aterials for M echanical Engineering,2013,37(9):29-32.)
[9]王俊山,史培阳,刘承军,等.镍含量对高强耐候钢组织与性能的影响[J].材料与冶金学报,2015,14(2):135-138.(WANG Jun-shan,SHI Pei-yang,LIU Cheng-jun,et al. Effect of Ni contents on structure and properties of high strength w eathering resistant steel[J]. Journal of M aterials and M etallurgy,2015,14(2):135-138.)
[10]薛飞飞,张英乔,孟庆润,等.镍、铬对高强钢金属粉芯型药芯焊丝熔敷金属组织与性能的影响[J].电焊机,2014,44(5):89-92.(XUE Fei-fei,ZHANG Ying-qiao,MENG Qing-run,et al. Effect of Ni and Cr on the microstructure and properties of deposited metal w ith metal cored w ire of high strength steel[J]. Electric Welding M achine,2014,44(5):89-92.)