镍含量对海洋平台用钢组织性能的影响  

Effect of Ni Content on Microstructures and Mechanical Properties of Offshore Platform Steel

作　　者：狄国标[1] 周砚磊[2] 麻庆申[1] 姜中行[1] 刘振宇[2] 

机构地区：[1]首钢技术研究院,北京100041 [2]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110004

出　　处：《钢铁研究学报》2012年第6期52-56,共5页Journal of Iron and Steel Research

基　　金：国家高科技技术发展计划(2007AA03Z504)

摘　　要：研究了空冷条件下,海洋平台用钢中的不同镍含量(wNi=0.2%,0.53%,0.8%、1.11%)对其显微组织及力学性能的影响。结果表明,当镍含量较低时,所得显微组织为铁素体和马氏体,晶粒尺寸粗大;随着镍含量的增加,多边形铁素体量降低,针状铁素体量提高,M/A岛更加细小弥散,析出相由相间析出向均匀弥散析出转变,析出粒子尺寸降低;试验钢的屈服强度和抗拉强度随镍含量增加而单调增加,伸长率先增加后降低,而韧脆转变温度先降低后增加,当wNi=0.5%～0.83%时,试验钢具有最佳的低温韧性。The effect of Ni content （WNi = 0.2 %, 0.53 %, 0.8 %, 1.11 %） on microstructure and mechanical properties was investigated. Results show that low content leads to ＂ferrite and martensite＂ microstructure with coarse grain size. With increasing Ni content, more acicular ferrite is obtained at the expense of polygonal ferrite. M/A island is more finely distributed. And the precipitate mode from the interphase precipitation changes to the uniform dis- persion of precipitation with decreased size. Both yield strength and tensile strength monotonously increase with the Ni content. The elongation first increases and then decreases, while the ductile-brittle transition temperature responses in an opposite way. The steel with 0.5%-0. 83% Ni yields the best low temperature toughness.

关 键 词：海洋平台钢 析出 M/A岛 

分 类 号：TG142.1[一般工业技术—材料科学与工程]