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首页> 外文期刊>Corrosion Science and Technology >Effect of Induction Heat Bending Process on the Corrosion Properties of 316 Stainless Steel Pipes for Nuclear Power Plant
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Effect of Induction Heat Bending Process on the Corrosion Properties of 316 Stainless Steel Pipes for Nuclear Power Plant

机译：感应热弯工艺对核电站316不锈钢管腐蚀性能的影响

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摘要

Recently, the application of bending products has been increased since the industries such as automobile, aerospace, ships, and plants greatly need the usage of pipes. For facility fabrication, bending process is one of key technologies for pipings. Induction heat bending process is composed of bending deformation by repeated local heat and cooling. Because of local heating and compressive strain, detrimental phases may be precipitated and microstructural change can be induced. This work focused on the effect of induction heat bending process on the properties of ASME SA312 TP316 stainless steel. Evaluation was done on the base metal and the bended areas before and after heat treatment. Microstructure analysis, intergranular corrosion test including Huey test, double loop electropotentiokinetic reactivation test, oxalic acid etch test, and anodic polarization test were performed. On the base of microstructural analysis, grain boundaries in bended extrados area were zagged by bending process, but there were no precipitates in grain and grain boundary and the intergranular corrosion rate was similar to that of base metal. However, pitting potentials of bended area were lower than that of the base metal and zagged boundaries was one of the pitting initiation sites. By re-annealing treatment, grain boundary was recovered and pitting potential was similar to that of the base metal.
机译：近年来，由于汽车，航空航天，轮船和工厂等行业非常需要使用管道，因此弯曲产品的应用有所增加。对于设备制造而言，弯曲工艺是管道的关键技术之一。感应加热弯曲过程由反复局部加热和冷却引起的弯曲变形组成。由于局部加热和压缩应变，有害相可能会沉淀，并可能引起微观结构变化。这项工作的重点是感应加热弯曲工艺对ASME SA312 TP316不锈钢性能的影响。在热处理之前和之后对母材和弯曲区域进行评估。进行了微结构分析，包括休伊（Huey）试验的晶间腐蚀试验，双回路电势动力学活化试验，草酸蚀刻试验和阳极极化试验。在显微组织分析的基础上，弯曲外凸区的晶界通过弯曲过程呈锯齿状，但在晶界和晶界均无析出物，晶界腐蚀速率与母材相近。但是，弯曲区域的点蚀电位低于母材，而锯齿状边界是点蚀的起始部位之一。通过再退火处理，恢复了晶界，并且点蚀电位与贱金属相似。

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