采用自制的稀土-低熔点合金对一种含碳量为1.9%的超高碳钢进行了变质处理,通过OM,SEM,EDS,DSC研究了变质处理和热处理工艺对超高碳钢的微观组织和力学性能的影响.结果表明:超高碳钢经变质处理后,共晶碳化物断网,获得了不连续的块状碳化物,初生奥氏体晶粒明显细化;由于Ce2O2S的吉布斯自由能负值较大,其稳定性较高,因此,稀土元素与O,S在钢中最易形成的稀土氧硫化合物为Ce2O2S;同时稀土与低熔点合金元素的加入,是强烈促进珠光体的元素,具有稳定珠光体的作用,提高了奥氏体化温度;经淬火与低温回火后,获得了马氏体基体上分布着弥散均匀、细小的不连续断网碳化物,冲击韧性得到了明显提高,其ak值由5.8 J·cm-2增加到12.5 J·cm-2,且硬度值基本保持HRC=65,获得了良好的综合力学性能.
参考文献
| [1] | Oleg D. SHERBY .Ultrahigh Carbon Steels, Damascus Steels and Ancient Blacksmiths[J].ISIJ International,1999(7):637-648. |
| [2] | Sherby 0 D;Oyama T;Alto P;Park M,Wadsworth J .Divor-ced eutectoid transformation process and product of ultrahigh car-bon steels[P].United States:4448613,1984. |
| [3] | Sherby O D .Ultrahigh carbon steel alloy and processing thereof[P].United States:4533390,1985. |
| [4] | Oyama T;Sherby 0 D;Wadsworth J;Walser B .Application of the divorced eutectoid transformation to the development of fine-grained,spheroidized structures in ultrahigh carbon steels[J].Scripta Metallurgica,1984,18:799. |
| [5] | Tsuzaki K;Sato E;Furimoto S;Furuhara T Maki T .Forma-tion of (α + θ) microduplex structure without thermomechanical processing in superplastic ultrahigh carbon steels[J].Scripta Materialia,1994,40(06):675. |
| [6] | Taleff E.M.;Syn C.K. .Pearlite in Ultrahigh Carbon Steels: Heat Treatments and Mechanical Properties[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,1996(1):111-118. |
| [7] | 宋延沛,李秉哲,朱景芝,谢敬佩,周国峰.稀土复合变质剂对高碳高速钢性能及组织的影响[J].钢铁研究学报,2001(06):31-34. |
| [8] | 潘福贞,杨华,焦金玲,魏代斌.K/Na-RE复合变质对辊环用高速钢组织及力学性能的影响[J].铸造,2006(02):164-168. |
| [9] | 余宗森;褚幼义;贺信莱;杜国维 高佩钰 朱逢吾.钢中稀土[M].北京:冶金工业出版社,1982:5. |
| [10] | Yu Z .Research on the application of rare earths in iron and steel in recent years[J].Journal of Rare Earths,1990,8(02):139. |
| [11] | 张景怀,唐定骧,张洪杰,王立民,王军,孟健.稀土元素在镁合金中的作用及其应用[J].稀有金属,2008(05):659-667. |
| [12] | 肖于德,廖敏,王伟,刘锷,肖治平.添加铬合金化和复合变质处理对白口铸铁组织性能的影响[J].中南大学学报（自然科学版）,2007(06):1067-1071. |
| [13] | Fu Hanguang,Zou Dening.Effects of Rare Earth and Alkaline Earth on Spheroidizing of Eutectic Carbides in Low Tungsten White Cast Iron[J].稀土学报（英文版）,2004(z3):68-72. |
| [14] | Yang Qingxiang,Liao Bo,Liu Jianhua,Yao Mei.Effect of Rare Earth Elements on Carbide Morphology and Phase Transformation Dynamics of High Ni-Cr Alloy Cast Iron[J].中国稀土学报,1998(01):36-40. |
| [15] | Qian MA.;Harada S.;Chaochang W. .MODIFICATION OF HYPOEUTECTIC LOW ALLOY WHITE CAST IRONS[J].Journal of Materials Science,1996(7):1865-1871. |
| [16] | 张光业,唐果宁,张华,李会强.铈含量对NiAl-28Cr-5.5Mo-0.5Hf共晶合金氧化性能的影响[J].稀有金属,2009(03):333-337. |
| [17] | Zhang Zhanling;Liu Yongning;Zhu Jiewu;Yu Guang .Pro-cessing and properties of ultrahigh-carbon (1.6%) steel[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2008,483484:64. |
| [18] | Bedolla-Jacuinde A;Aguilar S L;Maldonado C .Eutectic modi-fication in a low-chromium white cast iron by a mixture of titani-um,rare earths,and bismuth:Part Ⅱ.Effect on the wear behav-ior[J].Journal of Materials Engineering and Performance,2005,14(02):149. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%