Affiliation:
1. Institute for Special Steels, Central Iron and Steel Research Institute, Beijing 100081, China
Abstract
The microstructures throughout a 696 × 1360 mm cross-section of an ISO 1.2738 prehardened steel block for a plastic mold were characterized via optical and electron microscopy and electron backscatter diffraction. The hardness, strength, and polishing performance of the steel block were also tested. The results showed that the microstructure of the steel bloom from the edge to the core consisted of tempered sorbite, tempered bainite, and pearlite microstructures. Abnormal upper bainite and coarse carbides were also found. The bloom sections with hardness values of 37.4 to 39.3 HRC comprised tempered sorbite and bainite. The hardness of the core was approximately 36.5 HRC due to the presence of pearlite. The tensile and yield strengths were the same in the edge and middle areas mainly owing to tempered sorbite. The polishing performance was affected by the microstructure. Tempered sorbite produced the best polishing performance due to its fine and uniform microstructure, whereas that of tempered bainite and pearlite, which contained large carbide particles and mixed phases, was worse.
Funder
National Science and Technology Major Project
Reference31 articles.
1. (PDF) Fatigue Behavior of Homogeneous-Microstructure and Mixed-Microstructure Steels (researchgate.net).
2. Influence of the Microstructure on Fatigue and Fracture Toughness Properties of Large Heat-treated Mold Steels;Firrao;Mater. Sci. Eng. A,2013
3. Improvement of hardenability and static mechanical properties of P20 + 0.5Ni mold steel through additions of vanadium and boron;Beaudet;ISIJ Int.,2012
4. Comparison of microstructure and mechanical behavior of lower bainite and tempered martensite in JIS SK5 steel;Meng;Mater. Chem. Phys.,2007
5. Comparison of the Microstructures in Continuous-cooled and Quench-tempered Pre-hardened Mould Steels;Hoseiny;Mater. Des.,2011
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