Abstract
Effect of tempering temperature on impact wear morphology and properties of 30Cr3Mo2WNi hot working die steel were investigated by means of SEM, TEM, hardness and impact wear tests. In the tempering temperatures from 300℃ to 680℃, the hardness of the steel decreases and the impact toughness increases with increasing tempering temperature, while a secondary hardening with maximum hardness value of 48.6 HRC was achieved at 550℃. Fatigue delamination wear is the main mechanism during the impact wear of the experimental steel, and three damage features can be identified with different tempering temperatures. Brittle fatigue cracks are easy to occur at low tempered temperature of 300℃. Ductile fatigue cracks occurs at medium temperatures. Surfaces of steel tempered are extruded at high temperature of 680℃.
Highlights
Die steel is an important metal material in manufacturing industry
The secondary hardening occurs when the steel is tempered at 550◦C, leading to a slight increase of the hardness
The impact wear behaviors of the 30Cr3Mo2WNi hot-working die steel has been studied under different conditions, and a few conclusions can be drawn from the results: 1. With the increase of tempering temperature, the hardness of the steel decreases and the toughness increases
Summary
Die steel is an important metal material in manufacturing industry. The service life of die steel mainly depends on the good toughness, high fatigue resistance, and high wear resistance (Zhu, 2001). Three specimens were prepared from each tempered steel for impact wear test. Scenario 1: Variations of Hardness and Impact Toughness With Tempering Temperatures for 30Cr3Mo2WNi Steel
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