采用热轧方式,利用回收铁屑制备新型不锈钢/铁屑芯包层钢筋.通过金相显微镜、SEM、EDS及显微硬度仪对不锈钢与铁屑芯的接触界面进行分析,并考察了轧制道次、轧制温度、石墨添加剂等对包层钢筋力学性能的影响.结果显示:经6道次轧制后,界面两侧发生了元素扩散,扩散距离70～80μm,铁屑中的铁向不锈钢中扩散,不锈钢中的Cr、Ni、Mn等元素向铁屑芯中扩散,使界面附近碳钢侧的显微硬度值明显提高.轧制道次的增加,提高了不锈钢与铁屑芯间的结合强度,两金属间的剪切强度最大为355 MPa.随轧制温度的提高,不锈钢/铁屑芯包层钢筋的抗拉强度、仲长率增加.1150和1 250℃轧制的包层钢筋的抗拉强度分别为470和500 MPa,伸长率分别为32％、35％.在铁屑中添加石墨粉可以改善铁屑芯的组织成分.随石墨添加量的增加,包层钢筋的抗拉强度提高,而伸长率降低.石墨添加量为1.0％(质量分数,下同)时,铁屑芯中析出白色网状的二次渗碳体,包层钢筋抗拉强度提高到736.5 MPa,但伸长率降低到16％,拉伸断口呈明显的脆性断裂形貌.
参考文献
| [1] | Samuel M .A New Technique for Recycling Aluminum Scraps[J].Journal of Materials Processing Technology,2003,135(01):117. |
| [2] | Allwood J M;HUANG Y;Barlow C Y.Recycling Scrap Alu minum by Cold-Bonding[A].Verona,2005:9. |
| [3] | Yoshiaki O;Susumu T;Kazumi M et al.Advanced Processing for Recycling of Iron Scrap With Impurities[J].Nukleoni ka,2006,51(01):113. |
| [4] | 肖宏,高亚男,赵铁勇.铁屑材料压制工艺及性能研究[J].材料科学与工艺,2011(01):65-70. |
| [5] | Dyja H;Lesik L;Mroz S et al.Theoretical and Experimental Analysis of Stress and Temperature Distribution During the Process of Rolling Bimetallic Rods[J].Journal of Materials and Processing Technology,2002,125-126:731. |
| [6] | William MC;DukeEF;Kellar J J et al.Stainless Steel Clad Rebar in Bridge Decks[R].Rapid City:South Dakota Department of Transportation Office of Research,2001. |
| [7] | Markeset G;Rostam S;Klinghoffer O .Guide for the Use of Stainless Steel Reinforcement in Concrete Structures[R].Oslo:Norwegian Building Research Institute,2006. |
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