7Ni钢和9Ni钢的显微组织  

Microstructures of 7Ni and 9Ni Steels

作　　者：朱荣光 吴铎[2] 侯家平 王飞龙[2] Wu Duo;Hou Jiaping;Wang Feilong;Zhu Yingguang(State Key Laboratory of Metal Material for Marine Equipment and Application, Anshan Liaoning 114009, China;Heavy and Medium Plate Marketing Center of Angang Steel Co., Ltd., Anshan Liaoning 114021,China)

机构地区：[1]海洋装备用金属材料及其应用国家重点实验室,辽宁鞍山114009 [2]鞍钢股份有限公司中厚板营销中心,辽宁鞍山114021

出　　处：《上海金属》2018年第1期39-44,共6页Shanghai Metals

摘　　要：采用常规生产工艺制作了7Ni钢,在力学性能、CCT曲线、微观组织等方面与9Ni钢进行了对比。结果表明,7Ni钢与9Ni钢的CCT曲线、显微组织和力学性能均相近,但7Ni钢的屈强比较低。7Ni钢中Cr、Mo合金元素的加入,弥补了因Ni的质量分数降低2%造成的强度下降。7Ni钢经两次淬火+高温回火热处理后,获得的奥氏体量与9Ni钢相比虽略有差异,但形成了晶粒更加细小的薄膜状奥氏体,同样有利于韧性的提高。A kind of7Ni steel was made by conventional productive technology,and compared with9Ni steel in terms of mechanical properties,CCT curve and microstructure.The results showed that7Ni and9Ni steels produced by the same process were similar in CCT curves,microstructures and mechanical properties,however,the yielding-to-tensile ratio of7Ni steel was lower than that of9Ni steel.The additions of chromium and molybdenum to7Ni steel made up for reduction in strength due to2%by mass decrease in nickel content in it.The7Ni steel subjected to two separate quenchings followed by high temperature tempering was slightly different from the9Ni steel in the amount of austenite,however,austenite in the form of thin film in the former,is also beneficial to an increase in its toughness.

关 键 词：7Ni钢 9NI钢 CCT曲线 热处理 奥氏体 

分 类 号：TG146.21[一般工业技术—材料科学与工程]