321不锈钢晶间腐蚀性能数据集

"321不锈钢中添加了Ti等元素，在晶界形成Ti的碳化物，有效抑制Cr的碳化物析出，降低晶界贫Cr，然而不能完全消除晶间腐蚀倾向性。晶界处碳化物析出的形貌和分布特征，及其伴随的晶界附近铬元素的贫化现象对材料的抗晶间腐蚀及晶间应力腐蚀开裂能力仍然有很大影响。虽然低 ΣCSL 晶界本身由于有序度高，具有更好的抗晶间破坏能力，但是低 ΣCSL 晶界耐晶间腐蚀主要还是通过间接方式起作用，即：在相同的热处理后，低ΣCSL晶界处的敏化程度比一般大角度晶界小，根据晶间腐蚀的贫铬理论，低ΣCSL晶界更耐腐蚀。所以在含有大量低 ΣCSL 晶界的奥氏体不锈钢和 Ni 基合金等材料中，不同类型晶界处碳化物析出形貌和分布的差异，以及这些晶界附近贫铬区的差别是十分值得研究的。结果表明，采用ASTM A262 C法将样品浸泡在沸腾硝酸腐蚀溶液中进行晶间腐蚀实验，经过最长336h的实验后，发现NonGBE样品总失重为5.6 mg/mm2，而GBE样品总失重为1.51 mg/mm2，其晶间腐蚀速度比NonGBE样品降低大约73%。

Elements such as Ti are added to 321 stainless steel, which forms Ti carbides at grain boundaries, effectively inhibiting the precipitation of Cr carbides and reducing Cr depletion at grain boundaries. However, this cannot completely eliminate the susceptibility to intergranular corrosion. The morphology and distribution characteristics of carbides precipitated at grain boundaries, along with the accompanying Cr depletion near grain boundaries, still have a significant impact on the material's resistance to intergranular corrosion and intergranular stress corrosion cracking. Although low-Σ CSL grain boundaries themselves have better intergranular damage resistance due to their high degree of ordering, their resistance to intergranular corrosion mainly functions indirectly: after the same heat treatment, the sensitization degree at low-Σ CSL grain boundaries is lower than that at general high-angle grain boundaries. According to the Cr depletion theory of intergranular corrosion, low-Σ CSL grain boundaries exhibit better corrosion resistance. Therefore, in materials such as austenitic stainless steel and Ni-based alloys containing a large number of low-Σ CSL grain boundaries, the differences in the morphology and distribution of carbides precipitated at different types of grain boundaries, as well as the differences in Cr-depleted zones near these grain boundaries, are worthy of in-depth study. The results show that intergranular corrosion tests were conducted by immersing specimens in boiling nitric acid corrosion solution according to ASTM A262 C method. After up to 336 h of testing, the total weight loss of the NonGBE specimen was 5.6 mg/mm², while that of the GBE specimen was 1.51 mg/mm², indicating that the intergranular corrosion rate of the GBE specimen decreased by approximately 73% compared to the NonGBE specimen.

搜集汇总

背景与挑战

背景概述

该数据集聚焦于321不锈钢的晶间腐蚀性能研究，通过晶界工程处理，实验显示GBE样品比NonGBE样品的晶间腐蚀速度降低约73%。数据集包含实验数据、晶界特征分析等，旨在探究晶界类型对腐蚀行为的影响，适用于材料科学领域的腐蚀防护研究。