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| X80钢的热处理组织和性能研究 | |
| 引用本文： | 牛靖,刘迎来,张骁勇,吉玲康,冯耀荣,张建勋.X80钢的热处理组织和性能研究[J].焊管,2011,34(6):14-19. |
| 作者姓名： | 牛靖 刘迎来 张骁勇 吉玲康 冯耀荣 张建勋 |
| 作者单位： | 1. 中国石油集团石油管工程技术研究院,西安710065;西安交通大学材料学院,西安710049 2. 中国石油集团石油管工程技术研究院,西安,710065 3. 西安石油大学材料学院,西安,710065 4. 西安交通大学材料学院,西安,710049 |
| 基金项目： | 中国石油天然气集团公司重大科技专项(6990-HT-XEX-03- |
| 摘 要： | 利用组织分析、力学性能试验、断口分析等手段,对X80钢的热处理组织和性能进行了研究.结果表明,950℃加热可以使X80钢获得细小、均匀的奥氏体晶粒,适合作为X80钢的淬火温度;在550℃、600℃回火时,X80钢的组织为贝氏体铁素体(BF)+粒状贝氏体(GB),部分铁素体板条合并宽化,部分粒状贝氏体内部亚板条界开始合并... |
| 关 键 词： | X80钢 微观组织 热处理 回火温度 力学性能 |
Study on Heat Treatment Microstructure and Mechanical Properties of X80 Steel |
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| NIU Jing,LIU Ying-lai,ZHANG Xiao-yong,JI Ling-kang,FENG Yao-rong,ZHANG Jian-xun.Study on Heat Treatment Microstructure and Mechanical Properties of X80 Steel[J].Welded Pipe and Tube,2011,34(6):14-19. | |
| Authors: | NIU Jing LIU Ying-lai ZHANG Xiao-yong JI Ling-kang FENG Yao-rong ZHANG Jian-xun |
| Affiliation: | 1.CNPC Tubular Goods Research Center,Xi’an 710065,China; 2.School of Material Science and Engineering,Xi’an Jiaotong University,Xi’an 710049,China; 3.School of Material Science and Engineering,Xi’an Shiyou University,Xi’an 710065,China) |
| Abstract: | The heat treatment microstructure and properties of X80 steel were analyzed by means of structure analysis,mechanical properties test and fracture analysis.The results showed fine and well-proportioned austenitic grain is obtained,when X80 steel is heated at 950 ℃,950 ℃ is applicable quenching temperature for X80 steel.The microstructure of X80 steel is bainite ferrite(BF) + granular bainite(GB) when steel is tempered at 550 ℃ and 600 ℃,partial ferrite laths in BF merge and broaden,the interior sub-lath boundary in GB begin to merge and disappear,and the M/A constituent(a mixture of martensite plus retained austenite) in GB is orbicular,at the two tempering temperature the X80 steel shows a certain degree of tempering stability.The microstructure of X80 steel is GB + quasi-polygonal ferrite(QF) after 650 ℃ tempering,the original BF laths merge to form smaller GB crystal grains,it is the reason that the steel shows good combination of strength and toughness.The microstructure of X80 steel is mainly QF after 700 ℃ tempering,which can cause serious reduction of yield strength.The M/A constituent assemble and grow up in the grain boundary of QF,which cause worse low-temperature toughness for X80 steel. |
| Keywords: | X80 steel microstructure heat treatment tempering temperature mechanical property |
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