API 全名是美国石油学会,API-571主要是对金属腐蚀失效的各种情况有一个介绍。 按照标准,各种失效模式被分为7大类: 1. 所有工业 - 机械和冶金上的失效。 2. 所有工业 - 均匀或者局部厚度损失 3. 所有工业 - 高温腐蚀 (> 204 摄氏度) 4. 所有工业 - 环境腐蚀开裂 5. 炼油厂 - 均匀或者局部厚度损失 6. 炼油厂 - 环境腐蚀开裂 7. 炼油厂 - 其他失效模式 今天简单介绍一下 1-1 石墨化 Graphitization 石墨化主要是金属碳化物在长期高温(427°C to 593°C) 环境下退还成石墨,从而降低金属的强度。常见在碳钢和0.5Mo钢。 一般有两种石墨化失效,一种比较随机,另一种石墨会聚集成链或者层,这一种比较危险。 石墨化主要发生在工业的燃炉,焊接的热影响区。。。 采用含有chromium的材料可以有效降低石墨化,另外就是降低温度(不过比较不常见)。 最后,一般石墨化的失效很难在线检测,好在这种失效不是很常见,遇到了可能就是运气了。。。 ![image.png](https://cdn.steemitimages.com/DQmNhfjpRfXb4dwDUYyEsPLG6W79o9tbjxg1q8jKL2gu515/image.png)
author | shenchensucc |
---|---|
permlink | api-571-1-1-graphitization |
category | cn |
json_metadata | {"tags":["cn"],"image":["https://cdn.steemitimages.com/DQmNhfjpRfXb4dwDUYyEsPLG6W79o9tbjxg1q8jKL2gu515/image.png"],"app":"hiveblog/0.1","format":"markdown"} |
created | 2021-09-03 04:14:45 |
last_update | 2021-09-03 04:14:45 |
depth | 0 |
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author_reputation | 100,205,759,373,709 |
root_title | "API 571 失效模式 1-1 石墨化 Graphitization" |
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