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首页> 外文期刊>Materials Science and Engineering >Microstructural and mechanical properties evolutions of plasma transferred arc deposited Norem02 hardfacing alloy at high temperature
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Microstructural and mechanical properties evolutions of plasma transferred arc deposited Norem02 hardfacing alloy at high temperature

机译：等离子体转移电弧沉积的Norem02堆焊高温合金的微观组织和力学性能演变

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摘要

Plasma-transferred-arc welded Norem02, an iron-based hard-facing alloy, was characterised. Its microstructure and chemical composition were investigated using optical microscopy, scanning electron microscopy (with electron probe microanalysis), electron backscattering diffraction, and X-ray diffraction. The microstructure of the as-deposit alloy consists of a dendritic austenite structure with ferrite islets at dendrites centres, with an interdendritic eutectic region containing austenite, M7C3 and M_(23)C_6 carbides and zones containing Mo-rich precipitates. Tensile behaviour of Norem02 was characterised and completed by dilatometry tests in welding process temperature range. No significant phase transformation was detectable during mechanical testing. Different heat treatment cycles of ageing at high temperatures (until 1100℃) were carried out for different durations. The microstructure of Norem02 heated at 1100 ℃ was not significantly affected by a short time (15s) treatment whereas changes were observed for longer durations (2 h), although hardness remains almost unchanged. This work tends to demonstrate that for this alloy metallurgical evolution during the welding process has very little influence on mechanical properties.
机译：表征了等离子转移弧焊Norem02，一种铁基硬面合金。使用光学显微镜，扫描电子显微镜（使用电子探针显微分析），电子反向散射衍射和X射线衍射研究了其微观结构和化学组成。沉积合金的微观结构由在枝晶中心具有铁素体小岛的树枝状奥氏体结构，具有奥氏体，M7C3和M_（23）C_6碳化物的枝晶间共晶区域以及含有富钼沉淀物的区域组成。 Norem02的拉伸行为通过在焊接过程温度范围内的膨胀试验进行表征并完成。在机械测试过程中没有发现明显的相变。在高温（直到1100℃）下进行了不同的热处理时效，并进行了不同的持续时间。 1100℃加热的Norem02的显微组织在短时间内（15s）并没有明显影响，而在较长时间（2 h）内观察到了变化，尽管硬度几乎保持不变。这项工作倾向于证明，对于这种合金，在焊接过程中的冶金演变对机械性能的影响很小。

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