Ti对铬钼钒模具钢奥氏体化组织与性能的影响
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摘要
采用热力学计算与试验结合的方法研究了含Ti模具钢和不含Ti模具钢在不同奥氏体化温度下的组织与性能。研究表明,Cr_(23)C_6、Cr_7C_3、VC、V_2C、V_8C_7、MoC、Mo_2C、TiC的全固溶温度分别为748.2、952.7、977.3、632.9、1 116.0、1 131.2、645.3和1 044.1℃。随温度升高硬度及冲击韧性增大,奥氏体化温度高于1 200℃时,其对硬度影响更大,含Ti模具钢韧性优于不含Ti模具钢;随温度升高晶粒由细变粗,马氏体增多;含Ti模具钢平均晶粒尺寸比不含Ti模具钢平均晶粒尺寸小21.4μm;含Ti模具钢中未溶相尺寸比不含Ti模具钢未溶相尺寸小0.2μm左右。
The microstructure and properties of die steels with Ti and without Ti at different austenitizing temperatures were studied through the combination of thermodynamic calculation and experiment.The results show that the total solution temperature of Cr_(23)C_6,Cr_7C_3,VC,V_2C,V_8C_7,MoC,Mo_2C and TiC is 748.2,952.7,977.3,632.9,1 116.0,1 131.2,645.3and 1 044.1℃,respectively.Hardness and impact toughness both increase with the increase in temperature.When the austenitizing temperature is above 1 200℃,it has a greater influence on the hardness.Toughness of die steel with Ti is better than that without Ti.The grain becomes coarse and the amount of martensite increases with the increase of temperature.The average grain size of the die steel with Ti is 21.4μm smaller than that without Ti,and the size of the undissolved phase of the former is about 0.2μm smaller than that of the latter.
The microstructure and properties of die steels with Ti and without Ti at different austenitizing temperatures were studied through the combination of thermodynamic calculation and experiment.The results show that the total solution temperature of Cr_(23)C_6,Cr_7C_3,VC,V_2C,V_8C_7,MoC,Mo_2C and TiC is 748.2,952.7,977.3,632.9,1 116.0,1 131.2,645.3and 1 044.1℃,respectively.Hardness and impact toughness both increase with the increase in temperature.When the austenitizing temperature is above 1 200℃,it has a greater influence on the hardness.Toughness of die steel with Ti is better than that without Ti.The grain becomes coarse and the amount of martensite increases with the increase of temperature.The average grain size of the die steel with Ti is 21.4μm smaller than that without Ti,and the size of the undissolved phase of the former is about 0.2μm smaller than that of the latter.
引文
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[2] Zhou Q C,Wu X C,Shi N N,et al.Microstructure evolution and kinetic analysis of DM hot-work die steels during tempering[J].Materials Science and Engineering,2011,528A(18):5696.
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[4]计天予,吴晓春.H13改进型热作模具钢的组织与性能[J].钢铁研究学报,2013,25(5):31.(Ji T Y,Wu X C.Microstructure and mechanical properties of modified-H13hot working die steel[J].Journal of Iron and Steel Research,2013,25(5):31.)
[5] Guguloth K,Swaminathan J,Roy N,et al.Uniaxial creep and stress relaxation behavior of modified 9Cr-1Mo steel[J].Materials Science and Engineering,2017,684A:683.
[6] Jia Z,Misra R D K,Malley R O,et al.Fine-scale precipitation and mechanical properties of thin slab processed titanium-niobium bearing high strength steels[J].Materials Science and Engineering,2011,528A(22/23):7077.
[7]陈建华,张喜燕,刘攀,等.低碳微合金钢中碳化钛的等温析出行为[J].机械工程材料,2014,38(5):48.(Chen J H,Zhang X Y,Liu P,et al.Isothermal precipitation of TiC in low carbon micro-alloyed steel[J].Materials of Mechanical Engineering,2014,38(5):48.)
[8] Injin S,Changyul S,Sujeong L,et al.Bulk(Ti,Cr)N consolidated by pulsed current activated sintering and its mechanical properties[J].Ceramics International,2013,39:3441.
[9] Charleux M,Poole W J,Militzer M,et al.Precipitation behavior and its effect on strengthening of an HSLA-Nb/Ti steel[J].Metallurgical and Materials Transactions,2001,32A(7):1635.
[10]马坪,李倩,唐志国,等.冷轧工作辊用Cr5钢奥氏体化时碳化物的溶解及晶粒长大行为[J].机械工程材料,2010,34(6):21.(Ma P,Li Q,Tang Z G,et al.Carbide dissolution and grain growth behavior of Cr5steel as cold work roller during austenitizing[J].Materials for Mechanical Engineering,2010,34(6):21.)
[11]占礼春,马党参,迟宏宵,等.冷作模具钢奥氏体化过程的碳化物溶解情况[J].钢铁研究学报,2012,24(10):29.(Zhan C L,Ma D S,Chi H X,et al.Carbides dissolution of cold work die steels during austenitizing[J].Journal of Iron and Steel Research,2012,24(10):29.)
[12]赵冬伟.钛微合金钢中钼对含钛碳氮化物在奥氏体中溶解与析出的影响[D]//昆明:昆明理工大学,2012.(Zhao D W.Effect of Molybdenum on the Dissolution and Precipitation of Titanium-Bearing Carbonitrides in Austenite in Titanium Microalloyed Steel[D]//Kunming:Kunming University of Science and Technology,2012.)
[13]曹建春.铌钼复合微合金钢中的碳氮化物沉淀析出研究[D]//昆明:昆明理工大学,2006.(Cao J C.Study on Precipitation of Carbonitrides in Ni-Mo Composite Microalloyed Steel[D]//Kunming:Kunming University of Science and Technology,2006.)
[14]雍岐龙.钢铁材料中的第二相[M].北京:冶金工业出版社,2006.(Yong Q L.Secondary Phases in Steels[M].Beijing:Metallurgical Industry Press,2006.)
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[16]徐慧.合金元素对8407钢析出相影响的Thermo-calc研究[J].热加工工艺,2014(24):50.(Xu H.Effect of alloying elements on precipitation in 8407steel by thermo-calc software[J]. Hot Working Technology,2014(24):50.)
[17]宁安刚.热作模具钢中纳米级析出物及钢的综合强化机理研究[D]//北京:北京科技大学,2015.(Ning A G.Investigation on Nanoscale Precipitates in HotWork Die Steel and Comprehensive Strengthening Mechanism of Steel[D]//Beijing:University of Science and Technology Beijing,2015.)
[18]雍岐龙,刘正东,孙新军,等.钒微合金钢中碳氮化钒固溶量及化学组成的计算与分析[J].钢铁钒钛,2005,26(2):12.(Yong Q L,Liu Z D,Sun X J,et al.Theoretical calculation for equilibrium solubilities and compositional coefficient of V(C,N)in V-bearing microalloyed steel[J].Iron Steel Vanadium Titanium,2005,26(2):12.)
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