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Mechanical properties characterisation of welded joint of austenitic stainless steel using instrumented indentation technique

机译：仪器压痕技术表征奥氏体不锈钢焊接接头的力学性能

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摘要

The instrumented indentation test is a promising nondestructive technique for evaluating mechanical properties of metallic materials. In this study, the localised mechanical properties of welded joint of 304 austenitic stainless steel were characterised with the instrumented indentation test. The single V-groove welded joint was produced using the electric arc welding. A series of instrumented indentation tests were carried out at different regions, including base material, weld zone and heat-affected zone (HAZ). A soft zone regarding strength properties was found in the coarse-grain HAZ. The results show that the HAZ has the lowest yield strength and tensile strength (263.6 MPa, 652.5 MPa) compared with the base material (307.4 MPa, 807.9 MPa) and the weld zone (285.6 MPa, 702.1 MPa). In addition, characterisations of microstructure, microhardness and conventional tensile tests have been performed for comparison. The results reveal that the localised mechanical properties of welded joint of austenitic stainless steel can be represented effectively with the instrumented indentation technique.
机译：仪器压痕测试是一种用于评估金属材料机械性能的有前途的无损技术。在这项研究中，通过仪器压痕测试来表征304奥氏体不锈钢焊接接头的局部力学性能。使用电弧焊生产单个V型槽焊接接头。在不同区域进行了一系列仪器化压痕测试，包括基材，焊接区和热影响区（HAZ）。在粗粒热影响区中发现了一个与强度特性有关的软区。结果表明，与基材（307.4 MPa，807.9 MPa）和焊接区（285.6 MPa，702.1 MPa）相比，热影响区具有最低的屈服强度和拉伸强度（263.6 MPa，652.5 MPa）。另外，已经进行了微观结构，显微硬度和常规拉伸试验的表征以进行比较。结果表明，采用仪器压痕技术可以有效地表征奥氏体不锈钢焊接接头的局部力学性能。

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