摘要
研究了1 000～1 200℃1～3 h固溶、淬火或空冷对超低碳奥氏体不锈钢00Cr24Ni13(/%:≤0.02C、23～25Cr、13～14 Ni)200 mm×1 250 mm铸坯8铁素体转变的影响。结果表明,随固溶温度升高和保温时间延长铸坯中δ铁素体量减少;随固溶温度的升高,铸坯中的连续网状δ铁素体断开并且长大,空冷则会促使高温下长大的δ铁素体向小尺寸颗粒状组织转变;当铸坯试样在1 200℃保温3 h空冷后,网状δ铁素体完全转变成弥散分布的小于10μm的颗粒状铁素体组织,δ铁素体相比例也由14.3%降至7.3%。相对于颗粒状铁素体,网状δ铁素体的奥氏体-铁素体两相界面在轧制中更容易产生裂纹。
The effect of solid solution treatment at 1 000 - 1 200 ℃ for 1 - 3 h, quenching or air cooling on δ- ferrite transformation in 200 mm× 1 250 mm casting slab of ultra-low carbon austenite stainless steel 00Cr24Nil3 （/% ： ≤ 0. 02C, 23 -25Cr, 13 -14Ni） has been studied. Results show that with increasing solid solution temperature and extending holding time the amount of δ- ferrite in slab decreases ; with increasing solid solution temperature the network of δ- ferrite in casting slab is broken and coarsened; air cooling promotes the grown δ-ferrite at higher temperature transforming to smaller granular structure, and as casting slab sample solid solution treats at 1 200 ℃ for 3 h and cools in air the network δ-ferrite in slab sample completely transforms to dispersed less than 10μm granular ferrite structure and the δ-ferrite phase proportion also decreases from 14. 3% to 7.3%. Relative to granular ferrite the two phase interface of austenite and ferrite for network δ-ferrite structure is easily to form crack during rolling.
出处
《特殊钢》
北大核心
2013年第2期62-64,共3页
Special Steel
