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首页> 外文期刊>Materials Science and Engineering >Use of instrumented indentation testing to study local mechanical properties of 304L SS welded joints subjected to low-cycle fatigue loadings
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Use of instrumented indentation testing to study local mechanical properties of 304L SS welded joints subjected to low-cycle fatigue loadings

机译：使用仪器压痕测试研究承受低周疲劳载荷的304L SS焊接接头的局部力学性能

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In this paper, a series of experiments including room-temperature low-cycle fatigue tests, instrumented indentation measurements, optical microscopy examinations, etc. were carried out to study the local mechanical properties and microstructures in particular zones of 304L SS welded joints in both the as-welded and cyclic straining conditions. An analytical algorithm proposed by Dao et al. [12] was utilized to estimate the basic mechanical properties (E, σ_y and n) from the indentation load-depth data. It is shown that in the as-welded condition, the weld metal has a higher strength and strain hardening capacity but a lower stiffness than does the base metal, while the material within HAZ exhibits a significant gradient of the mechanical properties. A strain amplitude-dependent variation in the local mechanical properties in particular joint regions was also obtained. Optical microscopy examinations showed that the microstructure in particular zones of 304L SS welded joints was not only decided by the metallurgical condition resulting from the welding process, but also determined by the strain amplitude applied during cyclic straining. In this study, an empirical criterion for judging the fracture locations of a weldment based on the yield stress mismatch ratio was also introduced to assess the integrity of the present 304L SS welded joints subjected to low-cycle fatigue loadings. The research work performed in this paper would further expand the applications of instrumented indentation technique in fatigue strength analysis of welded components.
机译：本文进行了一系列实验，包括室温低周疲劳试验，仪器压痕测量，光学显微镜检查等，以研究304L SS焊接接头在特定区域的局部力学性能和显微组织。焊接和循环应变条件。 Dao等人提出的一种解析算法。 [12]被用来从压痕载荷深度数据估计基本的机械性能（E，σ_y和n）。结果表明，在焊接状态下，焊接金属比母材具有更高的强度和应变硬化能力，但刚度却更低，而热影响区中的材料则呈现出明显的机械性能梯度。还获得了特定接头区域中局部机械性能的应变幅度依赖性变化。光学显微镜检查表明，304L SS焊接接头特定区域的显微组织不仅取决于焊接工艺产生的冶金条件，而且还取决于循环应变过程中施加的应变幅度。在这项研究中，还引入了基于屈服应力失配比来判断焊件断裂位置的经验标准，以评估当前承受低周疲劳载荷的304L SS焊接接头的完整性。本文进行的研究工作将进一步扩展仪器压痕技术在焊接部件疲劳强度分析中的应用。

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