Experiments and Modeling to Characterize Microstructure and Hardness in 304L

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• 作者：Lisa Deibler ; Arthur Brown ; Joe Puskar
• 关键词：Recrystallization ; Stainless steel ; Microstructure ; Modeling
• 刊名：Metallography, Microstructure, and Analysis
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：6
• 期：1
• 页码：3-11
• 全文大小：
• 刊物主题：Metallic Materials; Characterization and Evaluation of Materials; Structural Materials; Surfaces and Interfaces, Thin Films; Nanotechnology;
• 出版者：Springer US
• ISSN：2192-9270
• 卷排序：6

文摘

Drawn 304L stainless steel tubing was subjected to 42 different annealing heat treatments with the goal of initializing a microstructural model to select a heat treatment to soften the tubing from a hardness of 305 Knoop to 225–275 Knoop. The amount of recrystallization and grain size caused by 18 heat treatments were analyzed via optical microscopy and image analysis, revealing the full range of recrystallization from 0 to 100%. The formation of carbides during the longer duration and higher-temperature heat treatments was monitored via transmission electron microscope evaluation. The experimental results informed a model which includes recovery, recrystallization, and grain growth to predict microstructure and hardness. After initialization of the model, it was able to predict hardness with a R2 value of 0.95 and recrystallization with an R2 value of 0.99. The model was then utilized in the design and testing of a heat treatment to soften the tubing.