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Influence of Tempering Temperature on the Microstructure and Mechanical Properties of a Cr–Ni–Mo‐Alloyed Steel for Rock Drill Applications
Author(s) -
Zhao Ming-Chun,
Unenbayar Tuguldur,
Zhao Ying-Chao,
Liu Chao,
Tian Yan,
Yin Dengfeng,
Atrens Andrej
Publication year - 2019
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201900297
Subject(s) - tempering , materials science , impact energy , microstructure , metallurgy , drill , hardness , vickers hardness test , izod impact strength test , composite material , ultimate tensile strength
This research investigates the mechanical properties of a Cr–Ni–Mo‐alloyed rock drill steel tempered at different temperatures from 150 to 550 °C. The highest strength, hardness, and impact energy occur when the steel is tempered at 180 °C. Strength, hardness, and impact energy decrease with increasing tempering temperature from 180 to 400 °C. For tempering temperatures higher than 400 °C, the steel exhibits: 1) an increase in impact energy; 2) an increase in strength and hardness when tempered at 420, 450, and 480 °C; and 3) a gradual decrease in strength and hardness when tempered at temperature higher than 480 °C. The mechanism of the changes of impact energy and hardness with tempering temperature is proposed.