淬火20CrNi2Mo低碳钢中大角度晶界对强度的影响

doi:10.11896/j.issn.1005-023X.2018.24.024

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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 (σ_d), solid solution hardening (σ_ss), precipitation hardening (σ_p) and grain boundary strengthening (σ_g). Subsequently, the Hall-Petch equation was used to determine the effective control unit of strength. The results showed that prior austenite grain (d_r), packet (d_p) and block (d_b) 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 σ_g or the common role for d_r, d_p and d_b, namely the dislocation was hindered from the high angle boundaries. The contribution of σ_d and σ_ss remained and σ_d was ignored. In addition, the martensite was the effective control unit of strength from the Hall-Petch relationship.

Key words： 20CrNi2Mo steel martensite multi-level microstructure high angle boundaries effective control unit

Published: 23 January 2019

CLC number:

TG142.1+2

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	Articles by authors
	LU Yemao
	LIANG Yilong
	LONG Shaolei
	YANG Ming
	YIN Cunhong

Cite this article:

LU Yemao,LIANG Yilong,LONG Shaolei, et al. Effect of the High Angle Boundaries on Strength for 20CrNi2Mo Steel[J]. Materials Reports, 2018, 32(24): 4339-4345.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.24.024 OR http://www.mater-rep.com/EN/Y2018/V32/I24/4339

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