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Erosion Resistance and Its Mechanism for Flame-Hardened 12Cr Steel by High Speed Water Drop Impacts

机译:高速水滴撞击强化火焰的12Cr钢的耐冲蚀性及其机理

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摘要

In this study, the water drop impact erosion properties of 12Cr steel surface-hardened by the flame hardening process have been studied. For this, both the maximum erosion depth de,max and volume loss Ve with the number of cumulative impacts n have been investigated for the flame-hardened 12Cr steels with different hardnesses. Typically all the samples showed an erosion-time characteristic involving an incubation period initially followed by a steady state period. Compared to those for the as-received 12Cr steel, the flame-hardened ones showed an excellent erosion resistance to water drop impacts, showing a 2.2~2.8 times higher incubation time ti and 5-8 times lower erosion rate a. In the incubation period the as-received 12Cr steel was deformed by a ductile depression and ploughing, while the flame-hardened one by fatigue cracks and a brittle platelet deformation. In the steady state period the damage was progressed by a cleavage fracture for both the stages.
机译:在这项研究中,研究了通过火焰淬火表面硬化的12Cr钢的水滴冲击腐蚀性能。为此,对于具有不同硬度的火焰硬化12Cr钢,已经研究了最大腐蚀深度de,max和体积损失Ve与累积冲击数n的关系。通常,所有样品均显示出腐蚀时间特性,包括最初的孵育期和稳态期。与原样的12Cr钢相比,火焰硬化的钢表现出优异的抗水滴冲击侵蚀性能,其ti的保温时间ti高2.2〜2.8倍,腐蚀速率a降低5-8倍。在孵化期,原样的12Cr钢由于延性的凹陷和塑性变形而变形,而由于疲劳裂纹和脆性的血小板变形而使火焰硬化。在稳态阶段,这两个阶段的断裂都是通过乳沟破裂造成的。

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