高纯Cr17铁素体不锈钢热轧板退火温度对冷轧退火板成形性能的影响

来源期刊：钢铁2010年第8期

论文作者：刘海涛 高飞 马东旭 刘振宇 王国栋

文章页码：75 - 79

关键词：铁素体不锈钢； 高纯化； 退火； 显微组织； 织构； 成形性能

Key words：ferritic stainless steel； high pure； annealing； microstructure； texture； formability

摘    要：研究高纯Cr17铁素体不锈钢的热轧板退火温度对最终冷轧退火板成形性能的影响。对一种铌、钛双稳定化的高纯Cr17铁素体不锈钢的热轧板进行了不同温度的退火试验,随后经相同的冷轧及退火处理,系统研究了其对组织演变、织构演变及成形性能的影响。结果表明:热轧板的退火温度是影响最终板成形性能的重要因素。随着热轧板退火温度的升高,冷轧退火板的晶粒尺寸逐渐增大甚至产生"混晶",γ纤维再结晶织构逐渐减弱,导致r值减小,Δr值增大,使成形性能恶化。所以,在保证热轧板发生完全再结晶的前提下,退火温度应尽量低。试验钢的热轧板经900℃退火后,冷轧退火板具有最佳的成形性能:r值高达1.80,而Δr值仅为0.15。

Abstract: The aim of this work was to investigate the effect of annealing temperature of an ultra-purified Cr17 ferritic stainless steel hot-rolled sheet on the formability of final cold-rolled and annealed sheet.The hot-rolled sheets of an ultra-purified Cr17 ferritic stainless steel stabilized with Nb and Ti were annealed at different temperatures and followed by the same cold rolling and annealing.The effects of hot-rolled sheet annealing temperature on microstructure evolution,texture evolution and formability were systematically investigated.It was shown that the hot-rolled sheet annealing temperature is an important factor to affect the formability of final sheet.Increasing hot-rolled sheet annealing temperature leads to much bigger grain even mixed microstructure and weakened γ-fiber texture in final cold-rolled and annealed sheet which deteriorates the formability with a reduction of r value and an increase of Δr value.Therefore,the hot-rolled sheet annealing temperature should be as low as possible with the precondition of fully recrystallization.The final sheets of investigated steel showed the best formability with r value of 1.8 and Δr value of 0.15 when the hot-rolled sheet was annealed at the temperature of 900℃.