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首页> 外文期刊>Materials Science and Engineering >Hydrogen embrittlement of high strength steam turbine last stage blade steels: Comparison between PH17-4 steel and PH13-8Mo steel
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Hydrogen embrittlement of high strength steam turbine last stage blade steels: Comparison between PH17-4 steel and PH13-8Mo steel

机译:高强度汽轮机末级叶片钢的氢脆性:PH17-4钢和PH13-8Mo钢的比较

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摘要

Hydrogen embrittlement behaviors of PH17-4 steel and PH13-8Mo steel used as steam turbine last stage blades were investigated by means of slow strain rate tensile tests and hydrogen permeation tests. The results indicate that PH13.8Mo steel exhibits higher strength level mainly due to higher precipitate strengthening and lath strengthening compared with PH17-4 steel in the absence of hydrogen. Moreover, pre-hydrogen charging does not affect tensile strength of PH17-4 steel, but decreases tensile strength of PH13-8Mo steel. The plasticity of PH17-4 steel and PH13-8Mo steel is degraded after hydrogen charging and the deterioration is accompanied with considerable change in fracture mode. The loss of plasticity of PH13-8Mo steel is higher than that of PH17-4 steel, indicating that PH13-8Mo steel exhibits lower resistance to hydrogen embrittlement, which is mainly related to higher hydrogen diffusion behaviors and higher strength level of PH13-8Mo steel. Additionally, PH17-4 steel exhibits lower apparent hydrogen diffusion coefficient and higher apparent hydrogen solubility in comparison with those of PH13-8Mo steel, which implies that incoherent Cu-rich precipitates in PH17-4 steel possess higher capability to trap hydrogen atoms than that of coherent NiAl precipitates in PH13-8Mo steel.
机译:通过慢应变速率拉伸试验和氢渗透试验研究了用作汽轮机末级叶片的PH17-4钢和PH13-8Mo钢的氢脆行为。结果表明,与无氢条件下的PH17-4钢相比,PH13.8Mo钢表现出更高的强度水平,这主要是由于其析出强化和板条强化更高。此外,预充氢不会影响PH17-4钢的拉伸强度,但会降低PH13-8Mo钢的拉伸强度。充氢后,PH17-4钢和PH13-8Mo钢的可塑性降低,并且其劣化伴随着断裂模式的显着变化。 PH13-8Mo钢的塑性损失高于PH17-4钢,表明PH13-8Mo钢表现出较低的抗氢脆性,这主要与氢扩散行为和PH13-8Mo钢的强度水平较高有关。另外,与PH13-8Mo钢相比,PH17-4钢具有较低的表观氢扩散系数和较高的表观氢溶解度,这表明PH17-4钢中不相干的富Cu析出物具有更高的捕获氢原子的能力。相干的NiAl在PH13-8Mo钢中析出。

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