9Cr-1.5Mo-1Co和9Cr-3W-3Co耐热钢强化机制的研究

Study on Strengthening Mechanism of 9Cr-1.5Mo-1Co and 9Cr-3W-3Co Heat Resistant Steels.

作者信息

Zhao Long, Chen Xiangru, Wu Tieming, Zhai Qijie

机构信息

Center for Advanced Solidification Technology (CAST), School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China.

Shanghai Electric Group Company Limited, Shanghai 200336, China.

出版信息

Materials (Basel). 2020 Sep 29;13(19):4340. doi: 10.3390/ma13194340.

DOI:10.3390/ma13194340

PMID:33003606

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7579476/

Abstract

The strengthening mechanism of 9Cr-1.5Mo-1Co and 9Cr-3W-3Co heat resistant steel was studied by tensile test and microstructure analysis. At the same temperature, the yield strength of 9Cr-3W-3Co heat-resistant steel is higher than that of 9Cr-1.5Mo-1Co heat-resistant steel. Microstructure analysis proved that the strength of 9Cr-1.5Mo-1Co and 9Cr-3W-3Co heat-resistant steel is affected by grain boundary, dislocation, precipitation, and solid solution atoms. The excellent high temperature mechanical properties of 9Cr-3W-3Co heat-resistant steel are mainly due to the solution strengthening caused by Co and W atoms and the high-density dislocations distributed in the matrix; however, 9Cr-1.5Mo-1Co heat-resistant steel is mainly due to the martensitic lath and precipitation strengthening.

摘要

通过拉伸试验和微观结构分析，研究了9Cr-1.5Mo-1Co和9Cr-3W-3Co耐热钢的强化机制。在相同温度下，9Cr-3W-3Co耐热钢的屈服强度高于9Cr-1.5Mo-1Co耐热钢。微观结构分析表明，9Cr-1.5Mo-1Co和9Cr-3W-3Co耐热钢的强度受晶界、位错、析出物和固溶原子的影响。9Cr-3W-3Co耐热钢优异的高温力学性能主要归因于Co和W原子引起的固溶强化以及基体中分布的高密度位错；然而，9Cr-1.5Mo-1Co耐热钢主要归因于马氏体板条和析出强化。