45钢等径弯曲通道变形及组织细化研究

钢铁, 2006, 41(1): 74-79.

45钢等径弯曲通道变形及组织细化研究

杜忠泽 ^1, , 冯广海 ^2, , 符寒光 ^3, , 王经涛 ^4, , 赵西成 ^5,

1.西安建筑科技大学冶金工程学院,陕西,西安,710055

2.西安建筑科技大学冶金工程学院,陕西,西安,710055

3.清华大学先进成形制造重点实验室,北京 100084

4.南京理工大学,江苏,南京,210094

5.西安建筑科技大学冶金工程学院,陕西,西安,710055

基金项目: 陕西省自然科学基金(2003E121) 中国科学院资助项目(59974018)

关键词： ECAP变形 , 45钢 , 超细晶 , 铁素体 , 珠光体

Study of ECAP Distortion and Structure Refinement for No. 45 Steel

研究了等径弯曲通道(ECAP)变形后45钢中先共析铁素体及珠光体组织的演变特征.结果表明,ECAP变形4道次后,片层状的珠光体组织演变成了超细的渗碳体颗粒均匀分布于亚微晶铁素体基体的组织.先共析铁素体由原始的平均晶粒尺寸约为30 μm演变为大角度晶界分离的、平均晶粒尺寸约为0.4μm的超细晶组织.ECAP变形后,先共析铁素体首先在其内部会形成具有薄片层界面(LBs)的板条位错胞甚至亚晶组织.进一步变形时位错胞或亚晶可继续细化.再进一步变形时通过晶界滑移和晶粒旋转的方式可以获得具有大角度晶界分离的、等轴的超细晶组织.

参考文献

[1]	Segal V M .Engineering and Commercialization of Equal Channel Angular Extrusion[J].Materials and Engineering A,2004,386(1-2):269-276.
[2]	Shin D. H.;Kim B. C. .MICROSTRUCTURAL CHANGES IN EQUAL CHANNEL ANGULAR PRESSED LOW CARBON STEEL BY STATIC ANNEALING[J].Acta materialia,2000(12):3245-3252.
[3]	Azushima A.;Aoki K. .Properties of ultrafine-grained steel by repeated shear deformation of side extrusion process[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2002(1/2):45-49.
[4]	Y. Fukuda;K. Oh-ishi;Z. Horita .Processing of a low-carbon steel by equal-channel angular pressing[J].Acta materialia,2002(6):1359-1368.
[5]	K.-T. Park;S.Y. Han;B.D. Ahn .Ultrafine grained dual phase steel fabricated by equal channel angular pressing and subsequent intercritical[J].Scripta materialia,2004(9):909-913.
[6]	Yoshinori Iwahashi;Jingtao Wang;Zenji Horita;Minoru Nemoto;Terence G. Langdon .Principle of equal-channel angular pressing for the processing of ultra-fine grained materials[J].Scripta materialia,1996(2):143-146.
[7]	Furukawa M.;Horita Z.;Nemoto M.;Langdon TG.;Iwahashi Y. .The shearing characteristics associated with equal-channel angular pressing[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,1998(2):328-332.
[8]	D.A.Huges;N.Hansen .Microstructure and strength of nickel at large strains[J].Acta materialia,2000(11):2985-3004.
[9]	Kiyotaka Nakashima;Zenji Horita;Minoru Nemoto .Influence of channel angle on the development of ultrafine grains in equal-channel angular pressing[J].Acta materialia,1998(5):1589-1599.
[10]	冯广海 .45钢ECAP变形及组织细化研究[D].西安建筑科技大学,2004.

上一张下一张

计量

下载量()
访问量()

作者相关

文章评分

您的评分：
1

0%
2

0%
3

0%
4

0%
5

0%

材料期刊网

45钢等径弯曲通道变形及组织细化研究

Study of ECAP Distortion and Structure Refinement for No. 45 Steel

参考文献