冷轧及退火工艺对40MnB钢带状组织的影响
Effect of Cold Rolling and Annealing Process on Banded Structure of Steel 40MnB
朱施利, 胡文豪
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作者单位：杭州钢铁集团 技术中心, 浙江 杭州 310022
中文关键字：40MnB； 带状组织； 冷轧压下量； 退火参数
英文关键字：40MnB; banded structure; cold rolling reduction; annealing parameters
中文摘要：比较了40MnB钢同一退火工艺、不同冷轧压下量试样的带状组织，以及相同压下量、低温退火与高温退火试样带状组织的区别；观察了试样在退火时以不同冷却速度冷却到A1温度时的显微组织形貌；测试了退火试样力学性能随压下量变化的曲线。结果表明：随冷轧压下量的增加，40MnB钢退火时带状组织是先加重后减轻；高温奥氏体化退火和快速从珠光体、铁素体两相区冷却到A1线能有效削减带状组织；带状组织不明显的材料力学性能未必优越，退火工艺参数的选择应和冷轧压下量合理匹配。
英文摘要：Banded structures of annealing samples for steel 40MnB were compared, which either had different cold rolling reductions at the same annealing process or had different annealing temperature at the same cold rolling reduction; Microstructure of annealing samples was observed when annealing temperature descended to A1 line in different speed; and the relation curves of mechanical properties and reductions were tested. The results show: banded structure after annealing becomes serious firstly, and become slight again, increasing cold rolling reductions; effect of eliminating banded structure is very evident, adopting austenitic anneal at high temperature and descending temperature from two phase field of pearlite and ferrite to line A1 quickly. The mechanical property of the samples with slight banded structure is unnecessarily excellent, the annealing parameters adopted ought to accord with the reduction after cold rolling.