The interaction of galling and oxidation in 316L stainless steel
The interaction of galling and oxidation in 316L stainless steel
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316L 不锈钢中磨损和氧化的相互作用
DOI：
10.1016/j.wear.2020.203234
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发表时间：
2020
期刊：
影响因子：
5
通讯作者：
Rogers S
中科院分区：
文献类型：
--
作者：
Rogers S
研究了316L不锈钢在模拟压水堆(PWR)水中暴露850h后，在非氧化态和氧化态下的划痕行为，并根据ASTM G196在常温下进行了划痕试验。316L在两种条件下均表现为楔形生长和流动机制。这导致了船头和粘结点前面的折叠，形成了一个严重剪切的多层船头。在楔形流动中，刮伤槽被认为是由于连续的剪切破坏而失效的。紧接在表面之下，可以看到一层高度剪切的纳米晶层，称为摩擦影响区(TAZ)。观察到在TAZ中形成了应变诱发马氏体。用Rt(最大高度-最大深度)和粘结面积(被认为是粘结的样品的比例)来量化粘结损伤，结果表明，这两种损伤指标对氧化样品都有显著的降低。在4.2 Mpa的正应力作用下，未氧化和氧化样品的粘结面积分别为14%和1.2%，Rt分别为780μm和2 6μm。这一趋势在施加较高的法向应力时出现，尽管不那么明显。这种刮伤行为的差异很可能是由于氧化表面的粘附性降低所致。
The galling behaviour of 316L stainless steel was investigated in both the non-oxidised and oxidised states, after exposure in simulated pressurised water reactor (PWR) water for 850 h. Galling testing was performed according to ASTM G196 in ambient conditions. 316L was found to gall by the wedge growth and flow mechanism in both conditions. This resulted in folds ahead of the prow and adhesive junction, forming a heavily sheared multilayered prow. The galling trough was seen to have failed through successive shear failure during wedge flow. Immediately beneath the surface a highly sheared nanocrystalline layer was seen, termed the tribologically affected zone (TAZ). It was observed that strain-induced martensite formed within the TAZ. Galling damage was quantified using R t (maximum height-maximum depth) and galling area (the proportion of the sample which is considered galled), and it was shown that both damage measures decreased significantly on the oxidised samples. At an applied normal stress of 4.2 MPa the galled area was 14% vs. 1.2% and the R t was 780 μ m vs. 26 μ m for the non-oxidised and oxidised sample respectively. This trend was present at higher applied normal stresses, although less prominent. This difference in galling behaviour is likely to be a result of a reduction in adhesion in the case of the oxidised surface.
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