等离子钨钼镝合金层的强化工艺及抗回火性能
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摘要
利用双层辉光等离子渗金属技术和固体渗碳法在Q235钢表面获得与冶金高速钢成分相当的等离子钨钼镝合金层,并对合金层进行不同温度的淬火和回火作为复合强化热处理,得到硬度和抗回火性都较高的合金强化层。采用场发射扫描电镜(附带能谱仪)和显微硬度计研究不同热处理工艺对等离子钨钼镝合金强化层的显微组织,硬度和抗回火性能的影响,结果表明,等离子钨钼镝合金层的最优强化热处理工艺为1050℃淬火+550℃回火,所得强化层中碳化物呈颗粒状弥散分布,且数量最多,尺寸最小(≤1μm),未经回火的表面硬度为1144HV_(0.05),在550℃回火出现二次硬化,表面硬度达到1153 HV0.05。
Plasma W-Mo-Dy alloying layer on the surface of Q235 steel was formed by double glow plasma surface metallurgy technology and pack carburizing,and its composition closes to metallurgy high- speed steel. Alloy strengthening layer with high hardness and temper resistance was gained by quenching and tempering at different temperatures as complex strengthening heat treatment. Then the effect of heat- treating process on the microscopic structure,hardness and temper resistance of alloy strengthening layer were studied by using FESEM,EDS and microhardness tester. The results show that the optimal process parameters of complex strengthening heat treatment were quenching at 1050 ℃ and then tempering at 550 ℃,and the alloy strengthening layer has the largest number of disperse carbide with smallest size( ≤1μm). The surface hardnesses of alloy strengthening layer with no tempering,tempering at 350 ℃ and tempering at 550 ℃ were 1144 HV_(0.05),934HV_(0.05),1153 HV_(0.05) respectively.
Plasma W-Mo-Dy alloying layer on the surface of Q235 steel was formed by double glow plasma surface metallurgy technology and pack carburizing,and its composition closes to metallurgy high- speed steel. Alloy strengthening layer with high hardness and temper resistance was gained by quenching and tempering at different temperatures as complex strengthening heat treatment. Then the effect of heat- treating process on the microscopic structure,hardness and temper resistance of alloy strengthening layer were studied by using FESEM,EDS and microhardness tester. The results show that the optimal process parameters of complex strengthening heat treatment were quenching at 1050 ℃ and then tempering at 550 ℃,and the alloy strengthening layer has the largest number of disperse carbide with smallest size( ≤1μm). The surface hardnesses of alloy strengthening layer with no tempering,tempering at 350 ℃ and tempering at 550 ℃ were 1144 HV_(0.05),934HV_(0.05),1153 HV_(0.05) respectively.
引文
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[2]戚正风,王传雅,孙明仁.无莱氏体高速钢2W-3Mo-4Cr-6V[J].特殊钢,1996,17(3):11-15.
[3]徐重.等离子表面冶金学[M].北京:科学出版社,2008.
[4]杜晓东.稀土催渗的锆硼共渗研究[J].稀有金属及硬质合金,2001(144):15-17.
[5]李延辉.低温盐浴氮碳钒共渗工艺研究[D].长沙:湖南大学,2006.46-48.
[6]陆小会,高原,王成磊,等.氮化钛薄膜与稀土表面高速钢的滑动磨损研究[J].稀土,2014,35(2):19-23.
[7]石德珂.材料科学基础[M].北京:机械工业出版社,2003.289.
[8]黄拿灿,胡社军.稀土表面改性及其应用[M].北京:国防工业出版社,2007.15.
[9]刘海军,刘利娟,陈玉珍.稀土对45#钢组织和性能的影响[J].稀土,2012,33(1):24-27.
[10]高原,徐晋勇,高清,等.双层辉光离子渗金属技术特点[J].中国工程科学,2008,10(2):26-30.
[11]Liang Yu;Shi Zhiyi;Liang Yilong.Effects of Ce or Nb addition on nucleation of pearlite in high carbon steel[J].Advanced Materials Research,2013,734-737:1531-1535.
[12]王维青.硅影响M2高速钢中碳化物形成和转变的研究[D].重庆:重庆大学,2012.
[13]吴昊.铌含量和淬火回火温度对轧辊用高速钢组织和性能的影响[D].北京:北京交通大学,2009.
[14]郭铁波.稀土对9Cr2Mo钢抗回火能力的影响[J].哈尔滨理工大学学报,1999,(5):23-26.
[15]魏雪,宋延沛,刘冰春,等.稀土复合变质处理对改进型无限冷硬铸铁轧辊组织与性能的影响[J].稀土,2014,35(4):25-29.