温度对X12CrMoWVNbN10-1-1钢组织及力学性能的影响

doi:10.12068/j.issn.1005-3026.2016.07.008

东北大学学报:自然科学版 ›› 2016, Vol. 37 ›› Issue (7): 946-950.DOI: 10.12068/j.issn.1005-3026.2016.07.008

温度对X12CrMoWVNbN10-1-1钢组织及力学性能的影响

刘越，郭浩，马煜林，古金涛

(东北大学材料科学与工程学院，辽宁沈阳110819)

收稿日期:2015-03-11 修回日期:2015-03-11 出版日期:2016-07-15 发布日期:2016-07-13
通讯作者: 刘越
作者简介:刘越(1960-)，男，辽宁沈阳人，东北大学教授.
基金资助:
国家自然科学基金重点基金资助项目(51334004)；辽宁省科技创新重大专项(201404001).

Effect of Temperature on Microstructure and Mechanical Properties of X12CrMoWVNbN10-1-1 Steel

LIU Yue， GUO Hao， MA Yu-lin， GU Jin-tao

School of Materials Science & Engineering， Northeastern University， Shenyang 110819， China.

Received:2015-03-11 Revised:2015-03-11 Online:2016-07-15 Published:2016-07-13
Contact: LIU Yue
About author:-
Supported by:
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摘要/Abstract

摘要： 对X12CrMoWVNbN10-1-1耐热钢进行了300~600℃之间的高温力学试验，利用OM，SEM 与TEM观察分析各温度下材料的微观组织及断口形貌，研究了温度对材料组织及高温力学性能的影响.结果表明:随温度升高，300~400℃，析出的脆性M₃C相的数量和尺寸不断增加，且出现偏聚，析出强化和形变强化作用逐渐增强，塑性变形中，脆性相M₃C处更容易出现应力集中，裂纹的产生、扩展更快，更易断裂，材料的塑性随之下降.400~600℃，碳化物发生转变，M₃C相快速重熔分解，M₇C₃及M₂₃C₆开始析出，使得析出相的数量和尺寸下降，强化作用减弱；同时，动态回复作用越来越强，材料的强度快速下降，塑性快速上升.

关键词: X12CrMoWVNbN10-1-1钢, 力学性能, 显微组织, 析出相, 原位转变机制

Abstract: The high temperature mechanical tests of X12CrMoWVNbN10-1-1 heat-resistant steel were carried out with the different testing temperature in the range of 300~600℃. The microstructure and fracture morphology of the samples at different temperature tests were analyzed using OM， SEM and TEM. Effect of temperature on the microstructure and high temperature mechanical properties was studied. The results showed that when the testing temperature increased in the range of 300~400℃， the quantity and size of brittle M₃C carbides gradually increased and the segregation became more significant， resulting in an increase of precipitation strengthening and work hardening. For plastic deformation stage， the stress concentration and cracks were more prone to appear around M₃C carbides during deformation. The plasticity slowly decreased with temperature. When the temperature increased between 400℃ and 600℃， it was found that the carbides started to transform， M₃C carbides decomposed rapidly， M₇C₃ and M₂₃C₆ carbides gradually precipitated and the quantity of precipitations began to decrease， which resulted in a decrease of strengthening ability. Meanwhile，dynamic recovery became more significant and led to a dramatic decrease of strength and rapid increase of plasticity.

Key words: X12CrMoWVNbN10-1-1 steel, mechanical properties, microstructure, precipitated phase, in-situ transformation mechanism

中图分类号:

TG142.1

刘越，郭浩，马煜林，古金涛. 温度对X12CrMoWVNbN10-1-1钢组织及力学性能的影响[J]. 东北大学学报:自然科学版, 2016, 37(7): 946-950.

LIU Yue， GUO Hao， MA Yu-lin， GU Jin-tao. Effect of Temperature on Microstructure and Mechanical Properties of X12CrMoWVNbN10-1-1 Steel[J]. Journal of Northeastern University Natural Science, 2016, 37(7): 946-950.

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温度对X12CrMoWVNbN10-1-1钢组织及力学性能的影响

Effect of Temperature on Microstructure and Mechanical Properties of X12CrMoWVNbN10-1-1 Steel

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