【摘要】 为研究退火工艺对冷轧中碳钢组织、织构演变以及力学性能的影响,利用OM、SEM、XRD、显微硬度计和万能试验机展开研究。结果表明,500℃保温时,以回复软化机制为主,被压扁的铁素体在保温30 min时才出现少许再结晶,保温10 min之后,显微硬度变化不明显,渗碳体以片层状为主;600℃保温时,其软化机制以再结晶为主,保温20 min时,仍存在部分未再结晶的变形铁素体晶粒,渗碳体片层以粒状为主,多偏聚于原珠光体区域,显微硬度急剧降低,保温30 min时再结晶完成;700℃保温10 min时铁素体再结晶基本完成,渗碳体为均匀的粒状分布,显微硬度变化较小;随退火温度升高以及保温时间的延长,γ织构强度减弱,而(110)<001>织构和γ’织构强度逐渐增强;当退火工艺为700℃保温10 min时,可以获得较好的强韧性组合。更多还原

【Abstract】 To research the effect of annealing process on microstructure evolution and mechanical property of medium cold rolled carbon steel was investigated by means of OM,SEM,XRD,micro-hardness tester and Universal tester. The results show that during soaking at 500 ℃,the recovery was the main soften mechanism,lengthened ferrite grains slightly recrystallized until the soaking time reached 30 min and most lamellar cementite remained,the decreasing of microhardness was not obvious after holding for 10 min. During soaking at 600 ℃,the main softening mechanism was recrystallization,some lengthened ferrite grains remained with soaking time of 20 min and most lamellar cementite transformed into spheroidization which concentrated at the original pearlite area,the micro-hardness decreased sharply with the increase of soaking time. The recrystallization completed until the soaking time reached 30 min. When the soaking temperature was 700 ℃ and the soaking time was 10 min,the recrystallization could complete,and the distribution of cementite particle was very uniform,the micro-hardness decreased little with soaking time from 10 min to 30 min,the density of γ fiber texture decreased with the increase of soaking time and temperature,while the density of(110)<001> andγ’ fiber texture increased. The best combination of strength and toughness was obtained at 700 ℃ and 10 min.更多还原