Tempering of Martensite in Dual-Phase Steels and Its Effects on Softening Behavior

被引:171
作者
Baltazar Hernandez, V. H.
Nayak, S. S. [1 ]
Zhou, Y. [1 ]
机构
[1] Univ Waterloo, Ctr Adv Mat Joining, Waterloo, ON N2L 3G1, Canada
来源
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2011年 / 42A卷 / 10期
关键词
HEAT-AFFECTED ZONE; GROWTH-KINETICS; CEMENTITE; CARBON; MICROSTRUCTURE; PRECIPITATION; BOUNDARY; CARBIDE; CR; MN;
D O I
10.1007/s11661-011-0739-3
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The isothermal and nonisothermal tempering of martensite in dual-phase (DP) steels was investigated mainly by analytical transmission electron microscopy, and the effect on softening behavior was studied. The isothermal tempering resulted in coarsening and spheroidization of cementite and complete recovery of laths. However, nonisothermal tempering manifested fine quasi-spherical intralath and platelike interlath cementite, decomposition of retained austenite, and partial recovery of laths. The distinct characteristic of nonisothermal tempering was primarily attributed to the synergistic effect of delay in cementite precipitation and insufficient time for diffusion of carbon due to rapid heating that delays the third stage of tempering. The finer size and platelike morphology of cementite coupled with partial recovery of lath resulted in reduced softening in nonisothermal tempering compared to severe softening in isothermal tempering due to large spheroidized cementite and complete recovery of lath substructure. The substitutional content of precipitated cementite in nonisothermal tempering was correlated to the richness of particular steel chemistry. Softening resistance during nonisothermal tempering was related to DP steel chemistry, i.e., Cr and Mn content. Fine cementite and less decomposed martensite in rich chemistry confer high resistance to softening compared to leaner chemistries, which indicated severe decomposition of martensite with coarser cementite.
引用
收藏
页码:3115 / 3129
页数:15
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