Effect of the High Angle Boundaries on Strength for 20CrNi2Mo Steel
LU Yemao1,2, LIANG Yilong1,2, LONG Shaolei1,2, YANG Ming1,2, YIN Cunhong2
1 College of Materials Science and Metallurgical Engineering, Guizhou University, Guiyang 550025; 2 Guizhou Key Laboratory for Mechanical Behavior and Microstructure of Materials, Guiyang 550025
Abstract: The micro-structures for 20CrNi2Mo were characterized quantitatively by OM, SEM, EBSD and TEM, and the contribution of strength was discussed from four strengthening mechanisms, e.g. dislocations hardening (σd), solid solution hardening (σss), precipitation hardening (σp) and grain boundary strengthening (σg). Subsequently, the Hall-Petch equation was used to determine the effective control unit of strength. The results showed that prior austenite grain (dr), packet (dp) and block (db) increased with the increasing of quenching temperature while the martensite lath decreased. Meanwhile, as the increasing of quenching tempe-rature, the strength of tested steel increased and the plasticity decreased. The increasing of strength was determined by σg or the common role for dr, dp and db, namely the dislocation was hindered from the high angle boundaries. The contribution of σd and σss remained and σd was ignored. In addition, the martensite was the effective control unit of strength from the Hall-Petch relationship.
卢叶茂, 梁益龙, 龙绍檑, 杨明, 尹存宏. 淬火20CrNi2Mo低碳钢中大角度晶界对强度的影响[J]. 材料导报, 2018, 32(24): 4339-4345.
LU Yemao, LIANG Yilong, LONG Shaolei, YANG Ming, YIN Cunhong. Effect of the High Angle Boundaries on Strength for 20CrNi2Mo Steel. Materials Reports, 2018, 32(24): 4339-4345.
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2018, Vol. 32 
