A Novel Classification Method for Carbide Grade by Using a New Shape Factor with Stress Distribution Analysis

Author:

Yao Jinxin1ORCID,Cheng Congqian1ORCID,Fang Yuanyuan2,Liu Wei2,Cao Tieshan1,Wang Shouchun2,Li Yanxin3,Meng Xianming4,Zhang Sai4,Zhao Jie1

Affiliation:

1. School of Materials Science and Engineering Dalian University of Technology Dalian 116024 China

2. Manufacturing Engineering Technology Center AECC Shenyang Engine Research Institute Shenyang 110015 China

3. Lab Center AECC Aero Engine Academy of China Beijing 101304 China

4. Central Research Institute China Automotive Technology and Research Center Co., Ltd. Tianjin 300300 China

Abstract

The carbide gradation related to geometry size and local stress concentration sensitivity significantly impacts the performance of the carburized 16Cr3NiWMoVNbE steel. The conventional metallurgical graphic comparison method by manual comparison is not capable of grading the carbide gradation automatically. A novel method is thus introduced to automatically evaluate the carbide grade by using a new shape factor φsc with stress distribution analysis instead of using the circularity or roundness shape factor which only considers the geometry shape of carbide particles. The logarithm of the stress concentration factor ln(K) is linearly related to the logarithm of the shape factor ln(φsc). The gradient b of the fitted straight line shows sensitivity to the carbide grade. The gradients are b1 = 0.039, b3 = 0.049, and b5 = 0.055 for the three carbide classes from low to high. Furthermore, there is also a linear relationship between hardness in different grades of carbide microstructure and the gradient b.

Publisher

Wiley

Subject

Materials Chemistry,Metals and Alloys,Physical and Theoretical Chemistry,Condensed Matter Physics

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