对固溶处理后的316L不锈钢试样进行了拉伸实验,根据Ludwik真应力应变模型对拉伸实验曲线进行了非线性拟合,并用Crussard-Jaoul法计算和分析了Ludwik模型中的加工硬化指数（n）,同时通过对拉伸试样的微观组织观察,分析了316L不锈钢的加工硬化机制.实验结果表明：316L不锈钢在拉伸变形过程中加工硬化非常明显,加工硬化率（θ）较高,而加工硬化指数（n）的变化较为复杂;在真应变为0.12前主要硬化机制是位错强化,之后直到变形结束,主要硬化机制是孪晶强化;316L不锈钢的孪晶可分为中止型孪晶和穿晶型孪晶,前者的形成机理是不全位错按极轴运动的结果,后者形成的本质是层错.
Tensile test has been conducted on the specimen after solution treatment for 316L stainless steel, according to Ludwik true stress-strain model,the curve of tensile test have been regressed by using nonlinear fitting method,the n value in Ludwik model has been calculated and analyzed by Crussard-Jaoul analysis, and mechanism of work hardening have been analyzed by observing the microstructure of specimen.These experiments reveal that 316L stainless steel is easy to work-hardening during tensile deformation,the value ofθ ie large and the change of n is complicated.When true strain is less than 0.12,the mechanism of work hardening is dislocation strengthening,when true strain is more than 0.12,the mechanism is twin strengthening; Twin in the 316L stainless steel can be divided into suspended twin and transgranular twin which have different formation mechanisms in growth,the former is the motion of partial dislocations,the latter is the stacking faults mechanism.
参考文献
| [1] | 王松涛,杨柯,单以银,李来风.高氮奥氏体不锈钢与316L不锈钢的冷变形行为研究[J].金属学报,2007(02):171-176. |
| [2] | J.W.SIMMONS .STRAIN HARDENING AND PLASTIC FLOW PROPERTIES OF NITROGEN-ALLOYED Fe-17Cr-(8-10)Mn-5Ni AUSTENITIC STAINLESS STEELS[J].Acta materialia,1997(6):2467-2475. |
| [3] | Shuhuai Lan;Hey-Jin Lee;Soo-Hun Lee;Jun Ni;Xinmin Lai;Hyoung-Wook Lee;Jung-Han Song;Moon G. Lee .Experimental and numerical study on the viscoelastic property of polycarbonate near glass transition temperature for micro thermal imprint process[J].Materials & design,2009(9):3525-3536. |
| [4] | Umemoto M.;Liu Z.G. .Tensile Stress-Strain Analysis of Single-Structure Steels[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,2000(7):1785-1794. |
| [5] | I. Mejia;C. Maldonado;J. A. Benito .Determination of the Work Hardening Exponent by the Hollomon and Differential Crussard-Jaoul Analyses of Cold Drawn Ferrite-Pearlite Steels[J].Materials Science Forum,2006(0):37-42. |
| [6] | 王兆昌,文玉华,李宁,赖志伟.基于Crussard-Jaoul的n值分析对高锰钢加工硬化机制的探讨[J].机械,2008(07):71-74. |
| [7] | 田兴,田如锦,王爱宝.奥氏体不锈钢304L和304LN的加工硬化特点[J].大连铁道学院学报,2001(04):59-64. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%