Influence of Austenite Grain Size on Mechanical Properties after Quench and Partitioning Treatment of a 42SiCr Steel

Metals

Bohuslav Masek¹  Marcus Böhme²  MartinF.-X. Wagner²  Hana Jirkova³  Marcel Graf⁴  Birgit Awiszus⁴  Sebastian Härtel⁴  Alexander Nitsche⁵ 

[1] COMTES FHT, Průmyslová 995, 33441 Dobřany, Czech Republic;Materials Science, Technische Universität Chemnitz, 09125 Chemnitz, Germany;Regional Technological Institut, University of West Bohemia, 301 00 Pilsen, Czech Republic;Virtual Production Engineering, Technische Universität Chemnitz, 09107 Chemnitz, Germany;Welding Engineering, Technische Universität Chemnitz, 09107 Chemnitz, Germany;

关键词: quench and partitioning (Q-P) process;    austenite grain;    martensitic microstructure;    mechanical behavior;    upsetting test;   

DOI  :  10.3390/met9050577

来源: DOAJ

【 摘 要 】

This paper examines how the initial austenite grain size in quench and partitioning (Q-P) processes influences the final mechanical properties of Q-P steels. Differences in austenite grain size distribution may result, for example, from uneven heating rates of semi-finished products prior to a forging process. In order to quantify this influence, a carefully defined heat treatment of a cylindrical specimen made of the Q-P-capable 42SiCr steel was performed in a dilatometer. Different austenite grain sizes were adjusted by a pre-treatment before the actual Q-P process. The resulting mechanical properties were determined using the upsetting test and the corresponding microstructures were analyzed by scanning electron microscopy (SEM). These investigations show that a larger austenite grain size prior to Q-P processing leads to a slightly lower strength as well as to a coarser martensitic microstructure in the Q-P-treated material.

【 授权许可】

Unknown