海工用低合金高强钢厚板的组织与力学性能
Heat Treatment of Metals（2023）
Abstract
采用TMCP后600℃回火的工艺生产了厚度为80 mm的420 MPa级高强度低合金宽厚板,利用光学显微镜、扫描电镜、电子背散射衍射、透射电镜、力学性能检测等手段,研究了其组织性能随厚度方向的变化规律.结果表明,TMCP钢板的晶粒尺寸分布在6～10 μm,组织主要为粒状贝氏体及块状铁素体,且表面处以贝氏体为主,心部以铁素体及碳化物为主;钢板600 ℃回火后在铁素体晶界有较多渗碳体析出,Nb、Ti元素的碳化物存在复合析出的现象.力学性能测试结果表明,宽厚板表面处的屈服强度可达542 MPa,而心部处的屈服强度为384 MPa.样品断裂方式以微孔聚集性断裂为主,且微孔多在铁素体板条间及夹杂物处形成.各强化机制对屈服强度的贡献中,细晶强化、析出强化占主导地位.
MoreKey words
high strength low alloy steel,heavy plate,microstructure and mechanical properties,offshore engineering,strengthening mechanism
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