退火温度对C-Mn-P-V高强度TRIP钢组织和力学性能的影响

INFLUENCE OF ANNEALING TEMPERATURE ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF C-Mn-P-V HIGH STRENGTH TRIP STEELS

通过不同温度的两相区退火处理,研究了C-Mn-P-V高强度TRIP钢的组织和力学性能。结果表明,在780～820℃范围内,随两相区退火温度的降低,铁素体量、残余奥氏体量增加,贝氏体量减少,抗拉强度Rm降低。TRIP钢中残余奥氏体量的增加明显提高延伸率,对强度也有贡献。780℃退火的工艺可获得最大强塑积—Rm.A=16630MPa.%。

Mechanical properties and microstructure of C-Mn-P-V TRIP steel annealed at different inter-critical temperatures were studied. Experimental results indicated that the bainite volume fraction and the value of Rm decreased, while fractions of ferrite and retained austenite increased with the decreasing of annealing temperature between 780 - 800℃. The increasing of retained austenite fraction not only raised the elongation rate, but also contributed to the strength. The maximum value of product of strength and ductility of 16630MPa·% was obtained by treatment of 780℃ annealing.