微量硼对S355-J1低碳钢相变规律的影响  

Effect of trace boron on phase transformation of S355-J1 low carbon steel

作　　者：蔡可森 姚永宽 刘伟建[3] 李翔 霍向东[4] 

机构地区：[1]南京钢铁股份有限公司中厚板卷厂,江苏南京210035 [2]江苏省高端钢铁材料重点实验室,江苏南京210035 [3]北京科技大学钢铁冶金新技术国家重点实验室,北京100083 [4]江苏大学材料科学与工程学院,江苏镇江212013

出　　处：《金属热处理》2015年第9期105-108,共4页Heat Treatment of Metals

摘　　要：采用热模拟方法研究了微量B对低碳钢动态CCT曲线的影响。结果表明,随冷却速度增加,S355-J1钢和含硼S355-J1钢先后发生铁素体(珠光体)相变→贝氏体相变→马氏体相变,并且分别在5℃/s和3℃/s出现贝氏体;相同冷速下,含硼钢的铁素体相变温度更低,而贝氏体相变温度更高。微量硼偏聚在奥氏体晶界,抑制铁素体形核并促进贝氏体形成,提高了低碳钢的淬透性。Thermal simulation was used to study the effect of trace boron on dynamic CCT curves of low carbon steel. The test results show that with the cooling rate increasing,ferrite,bainite and martensite gradually appear in S355-J1 steel and B-bearing S355-J1 steel,and bainitic transformation occurs at 5 ℃ / s,3 ℃ / s respectively. At the same cooling rate,the ferrite transformation temperature of boron steel is lower,but its baintie transformation temperature is higher. Trace boron segregating at austenite grain boundary inhibits the ferrite nucleation and promotes the formation of bainite,which raises hardenability of low carbon microalloyed steel.

关 键 词：硼 S355-J1钢 热模拟 相变 

分 类 号：TG142.13[一般工业技术—材料科学与工程]