针对HQ785试验钢,采用Gleeble-1500热模拟试验机进行了单向外加拉/压应力下的等温相变实验,等温温度分别是425℃和475℃,所加应力依次为20、40和60 MPa,通过光学显微镜和透射电镜对相变后的显微组织进行了观察与分析。结果表明,外加应力作用下的等温相变组织是粒状贝氏体,外加应力使无明显晶界的显微组织转变为晶界清晰的细小晶粒;粒状贝氏体中贝氏体铁素体的亚单元,随着外加拉应力的增加逐渐由条片向块状变化,随着外加压应力的增加逐渐由块状向条片变化。
Isothermal transformation tests of HQ785 steel were carried out on a Gleeble-1500 thermo-mechanical simulator at 425 ℃ and 475 ℃ under uniaxial tension/compression stresses of 20 MPa,40 MPa and 60 MPa,respectively.Microstructure of the steel after phase transformation was observed and analyzed by OM and TEM.The results show that the isothermal transformation microstructure is granular bainite under the external stress,the external stresses vary the transformation microstructure from no distinct grain boundary to fine grains with clear grain boundary.External stresses make the sub-units shape of granular bainitic ferrite change,the lath sub-units change to blocky sub-units with the external tensile stress increasing and the block-shaped sub-units change to lath sub-units with the external compression stress increasing for the HQ785 steel during isothermal bainitic transformation.
参考文献
| [1] | FURUHARA T;KAWATA H;MORITO S et al.Varian selection grain boundary nucleation of upper bainite[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,2008,39:1003-1012. |
| [2] | 刘宗昌;任慧平.贝氏体与贝氏体相变[M].北京:冶金工业出版社,2009 |
| [3] | Chang LC.;Bhadeshia HKDH. .STRESS-AFFECTED TRANSFORMATION TO LOWER BAINITE[J].Journal of Materials Science,1996(8):2145-2148. |
| [4] | 徐祖耀.应力作用下的相变[J].热处理,2004(02):1-17. |
| [5] | 徐祖耀.应力对钢中贝氏体相变的影响[J].金属学报,2004(02):113-119. |
| [6] | 苏铁健,李树奎,张朝晖,AEBY-GAUTIER E,DENIS S,BRIEN V.外加应力对贝氏体相变组织形貌的影响[J].材料科学与工艺,2005(03):251-253. |
| [7] | 冯红超 .应力对HQ785钢贝氏体相变动力学行为及相变塑性的影响[D].辽宁科技大学,2008. |
| [8] | BERAHAE;林慧国.SHPIGLERB.彩色金相[M].北京:冶金工业出版社,1984 |
| [9] | 翁宇庆.超细晶钢-钢的组织细化理论与控制技术[M].北京:冶金工业出版社,2003 |
| [10] | 杨景红,刘清友,孙冬柏,李向阳.轧制工艺对微合金管线钢组织及M/A岛的影响[J].北京科技大学学报,2009(02):180-185. |
| [11] | Chen CR.;Li SX. .Distribution of stresses and elastic strain energy in an ideal multicrystal model[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,1998(2):312-321. |
| [12] | 陆劲超 .微小应力下奥氏体→铁素体相变动力学过程分析[D].天津大学,2008. |
| [13] | 李凤照,敖青,孟凡妍,孟祥敏,刘玉先.贝氏体钢中贝氏体铁素体精细孪晶[J].材料热处理学报,2001(02):5-8. |
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