汽车用22MnB5与26MnB5钢组织性能对比
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摘要
对汽车用22MnB5钢与26MnB5钢进行CCT曲线、显微组织以及显微硬度测试等对比试验,分析两种材料在组织性能上的差异。结果表明,26MnB5钢相较于22MnB5钢,CCT曲线明显向右、向下移动,贝氏体的转变上限温度Bs点有较大差异,因为碳的增高明显推迟了贝氏体转变;且随着冷却速度的增加,碳含量增加对铁素体和珠光体转变的推迟作用加大。由于26MnB5钢的终轧温度、卷取温度均高于22MnB5钢,所以26MnB5钢的带状组织更加明显。因此,较低的终轧温度可以减轻带状组织,此外,低温卷取可以保证层流冷却的冷却速率。材料的硬度随冷却速度加快而增大,在冷速为100℃/s时,22MnB5钢硬度为496 HV0. 1,含碳量略高的26MnB5钢硬度更高,为516 HV0. 1。
The CCT curve,microstructure and microhardness test of 22MnB5 steel and 26MnB5 steel for automobiles were carried out,and the differences in microstructure and properties between the two materials were analyzed. The results show that the CCT curve of 26MnB5 steel moves to the right and down obviously compared with 22MnB5 steel,and the upper limit temperature of Bs point of bainite transformation is quite different,because the increase of carbon obviously delays the bainite transformation. And with the increase of cooling rate,the delaying effect of carbon content on ferrite and pearlite transformation increases. As the finishing rolling temperature and coiling temperature of 26MnB5 steel are higher than those of 22MnB5 steel,the banded structure of 26MnB5 steel is more obvious. Therefore,a lower finishing temperature can reduce the banded structure,in addition,low-temperature coiling can ensure the cooling rate of laminar cooling. The hardness of the material increases with the increase of the cooling rate. When the cooling rate is 100 ℃/s,the hardness of 22MnB5 steel is 496 HV0. 1,while the hardness of 26MnB5 steel with slightly higher carbon content is higher,516 HV0. 1.
The CCT curve,microstructure and microhardness test of 22MnB5 steel and 26MnB5 steel for automobiles were carried out,and the differences in microstructure and properties between the two materials were analyzed. The results show that the CCT curve of 26MnB5 steel moves to the right and down obviously compared with 22MnB5 steel,and the upper limit temperature of Bs point of bainite transformation is quite different,because the increase of carbon obviously delays the bainite transformation. And with the increase of cooling rate,the delaying effect of carbon content on ferrite and pearlite transformation increases. As the finishing rolling temperature and coiling temperature of 26MnB5 steel are higher than those of 22MnB5 steel,the banded structure of 26MnB5 steel is more obvious. Therefore,a lower finishing temperature can reduce the banded structure,in addition,low-temperature coiling can ensure the cooling rate of laminar cooling. The hardness of the material increases with the increase of the cooling rate. When the cooling rate is 100 ℃/s,the hardness of 22MnB5 steel is 496 HV0. 1,while the hardness of 26MnB5 steel with slightly higher carbon content is higher,516 HV0. 1.
引文
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[2]王伟.汽车车门轻量化及侧面碰撞安全性能研究[D].重庆:重庆交通大学,2014.
[3]So H,Hoffmann H.Design of hot stamping tools and blanking Strategies of ultra high strength steels[C]//EKC2008 Proceedings of the EU-Korea Conference on Science and Technology.2008:315-325.
[4]Chen S S,Han X H,Zhong Y Y.Research on hot stamping process for ultra-high strength steel with high product of strength and plasticity[C]//The International Conference on Advanced High Strength Steel and Press Hardening.2016:389-394.
[6]Lin J,Zhou Q.Research on the hot stamping process of quenchable ultrahigh strength steel[C]//International Conference on Advances in Construction Machinery and Vehicle Engineering,2007.
[7]Abe Y,Mori K I,Kosaka R.Improvement of fatigue strength of hole edge of ultra-high strength steel sheet by punching process including thickening[J].Key Engineering Materials,2016,716:428-434.
[8]Kuang Chunfu,Li Jun,Zhang Shen'gen,et al.Effects of quenching and tempering on the microstructure and bake hardening behavior of ferrite and dual phase steels[J].Materials Science and Engineering A,2014,613:178-183.
[9]Wolff B,Antonio M.Weldability of 600 and 800 dual-phase steels by using resistance spot welding medium frequency direct current(MFDC)and alternating current(AC)[J].American Ethnologist,2009,36(36):819-820.
[10]冯惠平,王四根.碳和锰元素对Mn-Si双相钢连续冷却转变的意识[J].金属热处理,1998,23(2):31-33.Feng Huiping,Wang Sigen.Influence of carbon and manganese on continuous cooling transformation of Mn-Si dual-phase steel[J].Heat Treatment of Metals,1998,23(2):31-33.
[11]刘云旭.低碳合金钢中带状组织的成因、危害和消除[J].金属热处理,2000,25(12):1-3.Liu Yunxu.Reason of formation,harmful effect and removal of band structure in low carbon alloy steel[J].Heat Treatment of Metals,2000,25(12):1-3.
[12]张迎晖,赖泓州,赵鸿金.钢中带状组织的研究现状[J].轧钢,2014,31(3):45-47.Zhang Yinghui,Lai Hongzhou,Zhao Hongjin.Research status of banded structure in steel[J].Steel Rolling,2014,31(3):45-47.
[13]沈黎晨,林大为.消除16Mn钢板带状组织的临界冷却速率研究[J].上海金属,1999,21(6):25-28.Shen Licheng,Lin Dawei.Research on critical cooling rate of banded structure in 16Mn steel plate[J].Shanghai Metal,1999,21(6):25-28.
[14]田亚强,宋进英,魏英立,等.控轧控冷工艺对J55石油套管用钢带状组织影响[J].塑性工程学报,2011,18(6):110-114.Tian Yaqiang,Song Jinying,Wei Yingli,et al.Influence of controlled rolling and cooling on banded structure of J55 oil casing[J].Journal of Plastic Engineering,2011,18(6):110-114.