3.4. Corrosion resistance propertyF

3.4. Corrosion resistance propertyFig. 9 displays the potentiodynamic anodic polarization curves of the samples in the 3.5 wt% NaCl solution. Comparing to the original substrate, the corrosion potential of all the laser transformation hardened samples showed the positive-shift, indicating that the corrosionresistance property of pre-hardened AISI P20 steel had been improved by LTH. Combining with the microstructure of original substrate and laser transformation hardened region discussed above, the reasons of this phenomenon could be divided into three aspects: (a) The large potential difference between ferrite (poor carbon phase) and pearlite (rich carbon phase) grains made it easily form corroding microcells and increase the trend of anodic dissolution. In contrast, the small potential difference between martensite grains weakened the driving force of electrochemical corrosion; (b) Martensite enhanced the compactness of the passivation film (a thin film formed by oxidation in air that adheres tightly to a metal surface) and reduced the internal stress accumulating,hence cracks and holes can hardly be produced to aggravate corrosion extent; (c) With the continuous dissolution of carbides during the heating process, more Cr atoms were precipitated out from carbides, which was the main element to improve the corrosion resistance property. The increase of Cr atom content was conductive to the balance of Cr content between the poor and rich Cr regions. Cr could also reduce the sensitive of intergranular corrosion and improve the repair ability of steel passivating film [25–27]. For the laser transformation hardened samples, the corrosion resistance property had been improved in different degrees with varied laser parameters, especially the sample with 1.8 kW 3 mm/s possessed the best corrosion resistance property. In contrast, the sample with 1.7 kW 3 mm/s possessed the worst corrosion resistance property because some of Cr atoms were still entrapped in the residual carbides. Comparing with the sample with 1.8 kW 3 mm/s and the sample with 1.8 kW 4 mm/s, both of them showed less distinct carbide particles. However, the high scanning velocity reduced the interactiontime between laser beam and material, resulting in more undissolved carbides than the sample with 1.8 kW 3 mm/s. Therefore,Cr atoms in the sample with 1.8 kW 4 mm/s played a weaker role in thepassivation film than that in the sample with 1.8 kW 3 mm/s.

3.4. Corrosion resistance propertyFig. 9 displays the potentiodynamic anodic polarization curves of the samples in the 3.5 wt% NaCl solution. Comparing to the original substrate, the corrosion potential of all the laser transformation hardened samples showed the positive-shift, indicating that the corrosionresistance property of pre-hardened AISI P20 steel had been improved by LTH. Combining with the microstructure of original substrate and laser transformation hardened region discussed above, the reasons of this phenomenon could be divided into three aspects: (a) The large potential difference between ferrite (poor carbon phase) and pearlite (rich carbon phase) grains made it easily form corroding microcells and increase the trend of anodic dissolution. In contrast, the small potential difference between martensite grains weakened the driving force of electrochemical corrosion; (b) Martensite enhanced the compactness of the passivation film (a thin film formed by oxidation in air that adheres tightly to a metal surface) and reduced the internal stress accumulating,hence cracks and holes can hardly be produced to aggravate corrosion extent; (c) With the continuous dissolution of carbides during the heating process, more Cr atoms were precipitated out from carbides, which was the main element to improve the corrosion resistance property. The increase of Cr atom content was conductive to the balance of Cr content between the poor and rich Cr regions. Cr could also reduce the sensitive of intergranular corrosion and improve the repair ability of steel  passivating film [25–27]. For the laser transformation hardened samples, the corrosion resistance property had been improved in different degrees with varied laser parameters, especially the sample with 1.8 kW 3 mm/s possessed the best corrosion resistance property. In contrast, the sample with 1.7 kW 3 mm/s possessed the worst corrosion resistance property because some of Cr atoms were still entrapped in the residual carbides. Comparing with the sample with 1.8 kW 3 mm/s and the sample with 1.8 kW 4 mm/s, both of them showed less distinct carbide particles. However, the high scanning velocity reduced the interactiontime between laser beam and material, resulting in more undissolved carbides than the sample with 1.8 kW 3 mm/s. Therefore,Cr atoms in the sample with 1.8 kW 4 mm/s played a weaker role in thepassivation film than that in the sample with 1.8 kW 3 mm/s.

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源语言: -

目标语言: -

结果 (简体中文) 1: [复制]

复制成功！

3.4。耐腐蚀性能 图9显示了在3.5 wt％的NaCl溶液中样品的电位动力学阳极极化曲线。与原始基材相比，所有经激光相变硬化的样品的腐蚀电位都显示出正位移，表明腐蚀 LTH改善了AISI P20预硬化钢的耐蚀性。结合上面讨论的原始衬底的微观结构和激光相变硬化区，这种现象的原因可分为三个方面：（a）制成的铁素体（碳相贫）和珠光体（富碳相）晶粒之间的电位差很大。它容易形成腐蚀的微孔并增加阳极溶解的趋势。相反，马氏体晶粒之间小的电势差削弱了电化学腐蚀的驱动力。（b）马氏体增强了钝化膜（由空气中的氧化形成的薄膜紧密地粘附在金属表面上）的致密性，并减少了内部应力的累积，因此几乎不会产生裂纹和孔眼，从而加剧了腐蚀程度；（c）随着加热过程中碳化物的不断溶解，更多的Cr原子从碳化物中沉淀出来，这是提高耐蚀性的主要元素。Cr原子含量的增加有利于贫Cr区和富Cr区之间的Cr含量平衡。铬还可以降低晶间腐蚀的敏感性并提高钢的修复能力 钝化膜[25–27]。对于激光相变硬化样品，随着激光参数的变化，其耐腐蚀性得到了不同程度的提高，特别是1.8 kW 3 mm / s的样品具有最佳的耐腐蚀性。相反，1.7 kW 3 mm / s的样品具有最差的耐腐蚀性，因为一些Cr原子仍残留在残留的碳化物中。与1.8 kW 3 mm / s的样品和1.8 kW 4 mm / s的样品相比，两者均显示出较少的碳化物颗粒。但是，高扫描速度降低了相互作用 激光束和材料之间的时间间隔，比1.8 kW 3 mm / s的样品产生更多的未溶解碳化物。因此，在1.8 kW 4 mm / s的样品中，Cr原子在钝化膜中的作用要弱于在1.8 kW 3 mm / s的样品中。

正在翻译中..

结果 (简体中文) 2:[复制]

复制成功！

3.4. 耐腐蚀性能 图9在3.5 wt%NaCl溶液中显示样品的强效极化曲线。与原基板相比，所有激光变硬样品的腐蚀潜力均呈正移位，表明腐蚀 LTH 提高了预硬化 AISI P20 钢的抗性特性。结合上述原始基材和激光转化硬化区域的微观结构，这一现象的原因可分为三个方面：（a）铁氧体（贫碳相）和珍珠石（富碳相）颗粒之间的巨大潜在差异，使其容易形成腐蚀微细胞，并增加非溶解的趋势。相比之下，马腾石颗粒之间的小潜在差异削弱了电化学腐蚀的驱动力：（b）马腾斯特增强钝膜的紧凑性（空气中氧化形成的薄膜，紧贴金属表面），减少内部应力积累，因此很难产生裂缝和孔洞，以加剧腐蚀程度：（c）随着碳化物在加热过程中的不断溶解，更多的Cr原子从碳化物中沉淀出来，硬质合金是改善耐腐蚀性的主要元素。Cr原子含量的增加对贫困和富裕的Cr地区之间的Cr含量平衡具有导电性。Cr还可以降低颅内腐蚀的敏感性，提高钢材的修复能力 钝化膜 [25-27] 。对于激光变换硬化样品，具有不同激光参数的不同程度提高了耐腐蚀性能，特别是具有1.8千瓦3毫米/s的样品具有最佳的耐腐蚀性能。相比之下，1.7 kW 3 mm/s 的样品具有最严重的耐腐蚀性能，因为一些 Cr 原子仍然被包裹在残留的硬质合金中。与 1.8 kW 3 mm/s 的样品和 1.8 kW 4 mm/s 的样本相比，这两个样本的碳化物颗粒都不太明显。但是，高扫描速度降低了交互性 激光束和材料之间的时间，导致更多的未溶解硬质合金比样品与1.8千瓦3毫米/s。因此，1.8 kW 4 mm/s 的样品中的 Cr 原子在沉着膜中的作用比 1.8 kW 3 mm/s 的样品中的作用要弱。

正在翻译中..

结果 (简体中文) 3:[复制]

复制成功！

3.4. 耐腐蚀性能 图9显示了样品在3.5 wt%NaCl溶液中的动电位阳极极化曲线。与原始基体相比，所有激光相变硬化试样的腐蚀电位都出现了正移，表明腐蚀发生了明显的变化 采用激光热处理技术提高了预硬化AISI P20钢的电阻性能。结合上述原始基体和激光相变硬化区的显微组织，造成这种现象的原因可分为三个方面：（1）铁素体（贫碳相）与珠光体（富碳相）晶粒间的电位差大，易形成腐蚀性微胞，增加了阳极溶解的趋势。相比之下，马氏体晶粒间较小的电位差削弱了电化学腐蚀的驱动力；（b）马氏体增强了钝化膜（一种在空气中氧化形成的薄膜，紧紧附着在金属表面）的致密性，减少了内应力的积累，随着碳化物在加热过程中的不断溶解，碳化物中析出更多的Cr原子，这是提高其耐蚀性能的主要因素。Cr原子含量的增加有利于贫Cr区与富Cr区Cr含量的平衡。铬还可以降低晶间腐蚀敏感性，提高钢的修复能力 钝化膜[25–27]。对于激光相变硬化试样，随着激光参数的变化，其耐蚀性能有不同程度的提高，特别是1.8kw3mm/s的试样耐蚀性能最好。相比之下，1.7kw3mm/s的试样的耐蚀性最差，因为残余碳化物中仍夹带着部分Cr原子。与1.8kw-3mm/s和1.8kw-4mm/s试样相比，它们的碳化物颗粒不明显。然而，高扫描速度降低了相互作用 激光束与材料之间的时间间隔，导致未溶解碳化物比1.8kw 3mm/s样品多，因此，1.8kw 4mm/s样品中的Cr原子在钝化膜中的作用弱于1.8kw 3mm/s样品。

正在翻译中..

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