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首页> 外文期刊>Journal of Materials Engineering and Performance >Influence of Oxide Particles and Hardness on the Toughness of Modified 9Cr-1Mo Steel Weld Metals
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Influence of Oxide Particles and Hardness on the Toughness of Modified 9Cr-1Mo Steel Weld Metals

机译：氧化物颗粒和硬度对改进的9Cr-1Mo钢焊接金属韧性的影响

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The main welding processes used for modified 9Cr-1Mo steel for the main steam pipes in ultra-supercritical thermal power plants are shielded metal arc welding (SMAW), submerged arc welding (SAW), and gas tungsten arc welding (GTAW). However, welding is rarely performed with the understanding that the toughness of the weld metals differs depending on the welding process. We investigated the dominant factors that determine the toughness of weld metals for these welding processes with different post-weld heat treatment (PWHT) temperatures. Both SMAW and SAW weld metals with high oxygen content possessed low toughness in their as-welded state, with many oxide particles (MnSiO3) observed on fracture surfaces. In contrast, the GTAW metal did not have any oxide particles and exhibited high toughness. Therefore, the presence of oxide particles facilitated crack formation at the interface between the oxide particles and the matrix, leading to low toughness. The toughness of SMAW and SAW metals was improved by PWHT, which was accompanied by a reduction in the oxide particle density on the fracture surface. The hardness is decreased by a decrease in the carbon content in the matrix with a decrease in the solid solution strengthening of carbon by precipitation of carbides. This decrease was reflected by the lower impact force measured during the Charpy test on the interface between the oxide particles and the matrix. Therefore, the dominant factors determining the toughness are the density of the oxide particles and the hardness of the matrix. Carbides precipitated by PWHT did not affect toughness. From the above, the toughness properties of modified 9Cr-1Mo steel weld metals were clarified from a metallographic point of view.
机译：用于用于超超临界热电厂主蒸汽管的改性9CR-1MO钢的主要焊接工艺是屏蔽金属弧焊（SMAW），埋弧焊（SAW），以及气体钨电弧焊接（GTAW）。然而，利用理解，焊接金属的韧性根据焊接过程而不同地进行焊接。我们调查了具有不同焊接后热处理（PWHT）温度的焊接工艺的焊接金属韧性的主导因素。具有高氧含量的Smaw和Saw焊接金属在其焊接状态下具有低韧性，在裂缝表面观察到许多氧化物颗粒（MNSIO3）。相反，GTAW金属没有任何氧化物颗粒并表现出高韧性。因此，氧化物颗粒的存在促进氧化物颗粒和基质之间的界面处的裂缝形成，导致低韧性。 PWHT改善了Smaw和Saw金属的韧性，其伴随着骨折表面上的氧化物颗粒密度的降低。通过基质中的碳含量降低，通过碳化物沉淀降低碳的固溶强化碳的碳含量降低，降低硬度。这种减少反映在氧化物颗粒与基质之间的邻接邻接期间测量的较低冲击力。因此，确定韧性的主要因素是氧化物颗粒的密度和基质的硬度。 PWHT沉淀的碳化物不影响韧性。从以上，从金相的角度澄清了改性的9Cr-1Mo钢焊接金属的韧性特性。

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