BSTMUF601合金的高温蠕变变形机制

doi:10.11900/0412.1961.2014.00293

金属学报

2015, Vol. 51

Issue (3): 349-356 DOI: 10.11900/0412.1961.2014.00293

本期目录 | 过刊浏览

BSTMUF601合金的高温蠕变变形机制

孙朝阳¹(

), 石兵¹, 武传标¹, 叶乃威², 马天军³, 徐文亮³, 杨竞¹

1 北京科技大学机械工程学院, 北京 100083
2 宁波宝新不锈钢有限公司, 宁波 315807
3 宝山钢铁有限公司特殊钢事业部, 上海 200940

HIGH TEMPERATURE CREEP DEFORMATION MECHANISM OF BSTMUF601 SUPERALLOY

SUN Chaoyang¹(

), SHI Bing¹, WU Chuanbiao¹, YE Naiwei², MA Tianjun³, XU Wenliang³, YANG Jing¹

1 School of Mechanical and Engineering, University of Science and Technology Beijing, Beijing 100083
2 Ningbo Baoxin Stainless Steel Co. Ltd., Ningbo 315807
3 Special Steel Business Unit, Baoshan Iron & Steel Co. Ltd., Shanghai 200940

引用本文:

孙朝阳, 石兵, 武传标, 叶乃威, 马天军, 徐文亮, 杨竞. BSTMUF601合金的高温蠕变变形机制[J]. 金属学报, 2015, 51(3): 349-356.
Chaoyang SUN, Bing SHI, Chuanbiao WU, Naiwei YE, Tianjun MA, Wenliang XU, Jing YANG. HIGH TEMPERATURE CREEP DEFORMATION MECHANISM OF BSTMUF601 SUPERALLOY[J]. Acta Metall Sin, 2015, 51(3): 349-356.

全文: PDF(3313 KB) HTML

摘要:

对BSTMUF601合金在不同温度和应力条件下进行了拉伸蠕变实验, 获得了该合金的高温蠕变的变形规律, 基于此提出了一种新的修正q映射法蠕变本构模型, 该模型考虑了蠕变3阶段的蠕变特点. 模型预测结果与实验结果吻合较好, 平均相对误差为1.86%, 相对于没有考虑第2阶段的θ映射法模型和没有考虑第1阶段的修正q映射法模型相对误差分别减少0.10%和6.02%, 表明该模型具有较强的适用性, 且不降低预测精度. 对蠕变和蠕变断裂试样的位错组态和空洞演化进行了显微分析, 结果表明, 稳态蠕变阶段蠕变应力指数都接近5, 合金主要通过位错攀移越过γ′相的方式变形, 并未观察到层错和微孪晶存在于γ′相或基体中, 蠕变变形机制主要是位错攀移. 空洞在晶界上形核, 长大连接形成裂纹, 在应力集中作用下, 裂纹沿晶界扩展, 最终导致断裂, 蠕变断裂机制主要是晶界断裂.

关键词 ： BSTMUF601合金, 蠕变变形, 稳态蠕变速率, 蠕变断裂

Abstract：

Muffle tube is the core component in a large bright annealing muffle furnace. A lot of defects will be found on the muffle tube after long-term application under high temperature, self-weight and uneven temperature conditions, and among them creep deformation is serious, directly affecting the usability and life expectancy of muffle tube. High temperature creep and rupture properties are important indicators of the muffle tube material, and BSTMUF601 nickel-based superalloy materials are commonly used in a muffle tube. Because of good oxidation resistance at high temperatures, high strength and good creep resistance, nickel-base superalloy materials are taken seriously especially its creep mechanism. For different alloys or alloys in different conditions, the conclusions about creep mechanism are different. So the research of each alloy is necessary. Creep tests of BSTMUF601 superalloy for elevated temperature were carried out under different temperatures and stresses. The creep deformation characteristic of BSTMUF601 superalloy was investigated based on the creep curves. And then, a creep constitutive model for elevated temperature was proposed by introducing a modified θ projection method, which contained three stages of creep. The predicted results by using the model are in good agreement with the experimental results. The average relative error of the model fitted is 1.86%. Compared with the model ignored the second stage of creep and the model ignored the first stage of creep, the average relative error is reduced 0.10% and 6.02%, respectively. It is indicated that the model will be a wider range of application whereas the prediction precision is not reduced. Dislocation structure and its distribution for creep specimens and void evolution for creep rupture specimens have been carried by analyzing the microscopic structure. The results show that the creep stress index is close to 5 during the steady-state creep stage for different temperatures. The dislocation climb mechanism controlls the creep deformation process. There is no stacking fault or microtwin observed in phase or matrix. Cracks originate from the cavities at grain boundary and along the boundary, which lead to fracture. Grain boundary fracture is the main creep rupture mechanism.

Key words： BSTMUF601 alloy creep deformation steady creep rate creep rupture

ZTFLH:

TG142.1

基金资助:* 国家自然科学基金项目50831008和51105029及国家科技重大专项项目2014ZX04014-51资助

作者简介: null

孙朝阳, 男, 1976年生, 副教授, 博士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2014.00293 或 https://www.ams.org.cn/CN/Y2015/V51/I3/349

图1 BSTMUF601合金蠕变前后的显微组织

图2 BSTMUF601合金在不同条件下的蠕变曲线和蠕变本构模型拟合结果

图3 BSTMUF601合金在1095 ℃, 应力为7.7 MPa条件下不同模型预测的蠕变曲线与实验结果对比

表1 BSTMUF601合金在不同条件下的稳态蠕变速率

BSTMUF601合金的lnεs -lnσ 关系曲线

图5 BSTMUF601合金在1095 ℃, 应力为5.7 MPa条件下蠕变后的TEM像

图6 BSTMUF601合金在870 ℃, 应力为32 MPa条件下蠕变断裂后的OM像

图7 BSTMUF601合金在1095 ℃, 应力为7.7 MPa条件下蠕变试样断口附近纵剖面和横截面的形貌

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