PH13-8Mo高强不锈钢在不同温度时效后的析出相及其对力学性能的影响
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摘要
将PH13-8Mo高强不锈钢先在925℃进行固溶处理,然后再分别于510,540,550,565,595℃下进行时效处理,研究了不同温度时效后试验钢中析出相的种类和含量,以及析出相对试验钢力学性能的影响。结果表明:在较低温度时效后,试验钢中的析出相以六方结构的M_2C为主,中温时效后的析出相为六方结构的M_2C、面心立方的M_(23)C_6和Ni_3Al以及体心立方结构的NiAl,高温时效后以体心立方的NiAl与面心立方的M_(23)C_6析出相为主;随着时效温度升高,析出相的含量逐渐增加,试验钢的抗拉强度与屈服强度逐渐降低,塑韧性不断提高;时效过程中析出的第二相粒子能起到阻碍位错运动的作用,从而提高试验钢的强度;试验钢在925℃固溶、540℃时效处理后可获得最佳的综合力学性能。
Solid-solution treatment was carried out on PH13-8Mo high strength stainless steel at 925℃,and then aging treatment was carried out at 510,540,550,565℃and 595℃to study the type and content of precipitated phases and the effect of precipitated phase on mechanical properties of the tested steel.The results show that the precipitated phase in the tested steel mainly is M_2C after aging at lower temperature,the precipitated phases are M_2C,M_(23)C_6,Ni_3Al and NiAl after aging at intermediate temperature,and the main precipitated phases are NiAl and M_(23)C_6 after high temperature aging.With the increase of aging temperature,the precipitated phase′s content increases,and tensile strength and yield strength of the tested steel gradually decrease,while ductility and toughness continuously improve.The precipitated second particles during aging can impede dislocation movement,and thus increase strength of the tested steel.The optimum comprehensive properties can be obtained for the tested steel after quenching at 925 ℃ and then aging at 540 ℃.
Solid-solution treatment was carried out on PH13-8Mo high strength stainless steel at 925℃,and then aging treatment was carried out at 510,540,550,565℃and 595℃to study the type and content of precipitated phases and the effect of precipitated phase on mechanical properties of the tested steel.The results show that the precipitated phase in the tested steel mainly is M_2C after aging at lower temperature,the precipitated phases are M_2C,M_(23)C_6,Ni_3Al and NiAl after aging at intermediate temperature,and the main precipitated phases are NiAl and M_(23)C_6 after high temperature aging.With the increase of aging temperature,the precipitated phase′s content increases,and tensile strength and yield strength of the tested steel gradually decrease,while ductility and toughness continuously improve.The precipitated second particles during aging can impede dislocation movement,and thus increase strength of the tested steel.The optimum comprehensive properties can be obtained for the tested steel after quenching at 925 ℃ and then aging at 540 ℃.
引文
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[2]孙志华,张晓云,汤智慧,等.PH13-8Mo钢在3.5%NaCl水溶液中应力腐蚀性能研究[J].腐蚀与防护,2003,24(2):55-57.
[3]舒小勇,鲁世强,郑海忠,等.应变对PH13-8Mo钢在1 050~1 150℃时变形组织的影响[J].宇航材料工艺,2011,41(5):69-73.
[4]程志伟,金建军,鲁世强,等.热处理工艺对PH13-8Mo钢组织和性能的影响[J].材料热处理学报,2013,34(11):48-54.
[5]GUO Z,SHA W,VAUMOUSSE D.Microstructural evolution in a PH13-8stainless steel after ageing[J].Acta Materialia,2003,51(1):101-116.
[6]张湛,薛春,黄春波,等.时效温度对PH13-8Mo不锈钢组织和力学性能的影响[J].机械工程材料,2014,38(11):72-75.
[7]HOCHANADEL P W,EDWARDS G R,ROBINO C V,et al.Heat treatment of investment cast PH13-8Mo stainless steelPart I:Mechanical properties and microstructure[J].Metallurgical and Materials Transactions A,1994,25(4):789-798.
[8]SERVANT C,GHERBI E H,CIZERON G.TEM investigation of the tempering behaviour of the maraging PH 17.4 Mo stainless steel[J].Journal of Materials Science,1987,22(7):2297-2304.
[9]王国承,王铁明,尚德礼,等.超细第二相粒子强化钢铁材料的研究进展[J].钢铁研究学报,2007,19(6):5-8.
[10]DAWOOD M A,MAHALLAWI I S E,AZIM M E A E,et al.Thermal aging of 16Cr-5Ni-1Mo stainless steel-Part 1:Microstructural analysis[J].Materials Science and Technology,2004,20(3):363-369.
[11]李见.材料科学基础[M].北京:冶金工业出版社,2006.
[12]ASHBY M F.The deformation of plastically nonhomogeneous materials[J].Philosophical Magazine,1970,21:399-424.
[13]雍岐龙.钢铁材料中的第二相[M].北京:冶金工业出版社,2006.