谷歌浏览器插件
订阅小程序
在清言上使用

Strain gradient plasticity phenomenon in surface treated plain carbon steel

Materials Science and Engineering: A(2023)

引用 0|浏览25
暂无评分
摘要
Surface engineering is essential for materials being used for functional and structural applications. There have been various approaches and mechanisms used for improving, mechanical, tribological and surface properties of materials over the years. One phenomenon that require much attention is indentation size effect (ISE). Mecha-nistic and phenomenological theories have been developed to explain the observed size dependence of me-chanical properties in materials. However, the dislocations microstructure evolution, deformation mechanisms and the contributions of length scale parameters are not fully understood. This paper explores the effects of surface carbo-nitriding on material length scale and dislocation microstructure mechanisms of 1045 steel. The material was carbo-nitrided at 500 degrees C and 900 degrees C, to induce nitrogen and carbon diffusion respectively, prior to, microstructural and mechanical (micro/nano-indentation) characterization. The statistically stored and geometrically necessary dislocation densities increased with increasing carbo-nitriding temperature. A bi-linear relationship was also established based on the indentation depth and hardness measurements. Three regimes of dislocation behaviour (dislocations source-limited/starvation, discrete dislocations, and continuum dislocations) are observed. The observed trends are explained using dislocation densities that were estimated using dislocation theories. The implications of the results are also discussed for the carbonitrided steels.
更多
查看译文
关键词
Strain gradient plasticity,Statistically stored dislocations,Geometrically necessary dislocations,Indentation size effect,Carbonitriding,Low carbon steel,Starvation,Discrete,Continuum,Length scale
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要