摘要
通过两阶段控轧+快速冷却,综合利用细晶强化、相变强化和析出强化等强化机制获得了分别满足GB/T 16270-1996中Q690和Q620要求的高强度工程机械用钢;着重研究了终冷温度对试验钢显微组织和力学性能的影响。结果表明:试验钢力学性能对终冷温度尤为敏感,随终冷温度降低,屈服强度、抗拉强度和屈强比升高,伸长率降低;试验钢低温韧性优良,针状铁素体的形成有利于提高低温韧性,弥散均匀分布的等轴M-A岛对低温韧性危害较小。
High strength steel which meets the requirement of Q690 and Q620 in GB/T 16270-1996 was obtained through grain refinement strengthening, transformation strengthening and precipitation strengthening by two stage controlled roiling followed by accelerated cooling. It was found that the mechanical properties were especially sensitive to the finish cooling temperature. Yield strength, tensile strength and yield ratio increased while elongation decreased with the decrease of the finish cooling temperature. Good low temperature toughness was obtained for the experimental steel. The formation of acicular ferrite was helpful to the improvement of low temperature impact toughness and uniformly distributed equiaxed M-A islands were less detrimental to low temperature impact toughness.
出处
《机械工程材料》
CAS
CSCD
北大核心
2008年第9期29-33,共5页
Materials For Mechanical Engineering
关键词
终冷温度
工程机械用钢
强化机制
finish cooling temperature
engineering machinery steel
strengthening mechanisms
