一级应变硬化F316奥氏体不锈钢的高温蠕变性能

doi:10.11901/1005.3093.2018.677

材料研究学报

2019, Vol. 33

Issue (7): 497-504 DOI: 10.11901/1005.3093.2018.677

研究论文

本期目录 | 过刊浏览

一级应变硬化F316奥氏体不锈钢的高温蠕变性能

王冬颖¹,王立毅²,冯鑫³,张滨³,雍兴平¹,张广平²(

)

1. 沈阳鼓风机集团核电泵业有限公司沈阳 110869
2. 中国科学院金属研究所沈阳材料科学国家研究中心沈阳 110016
3. 东北大学材料各向异性与织构教育部重点实验室材料科学与工程学院沈阳 110819

Creep Properties of Pre-deformed F316 Stainless Steel

Dongying WANG¹,Liyi WANG²,Xin FENG³,Bin ZHANG³,Xingping YONG¹,Guangping ZHANG²(

)

1. Shenyang Blower Works Group Corporation, Shenyang 110869, China
2. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3. Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China

引用本文:

王冬颖,王立毅,冯鑫,张滨,雍兴平,张广平. 一级应变硬化F316奥氏体不锈钢的高温蠕变性能[J]. 材料研究学报, 2019, 33(7): 497-504.
Dongying WANG, Liyi WANG, Xin FENG, Bin ZHANG, Xingping YONG, Guangping ZHANG. Creep Properties of Pre-deformed F316 Stainless Steel[J]. Chinese Journal of Materials Research, 2019, 33(7): 497-504.

全文: PDF(15585 KB) HTML

摘要:

研究了在200 MPa应力下一级应变硬化F316奥氏体不锈钢在650℃、680℃和700℃的蠕变性能和蠕变断裂行为。结果表明：在200 MPa 恒定应力下蠕变温度越高其蠕变寿命越短,稳态蠕变速率越大,由应力加载引起的瞬时应变越大。蠕变断裂方式主要为韧性断裂。蠕变孔洞主要分布在三叉晶界等脆弱部位,距离断口越远试样中孔洞的平均尺寸和孔洞面积百分比越小。在与断口距离相同的位置上,随着蠕变温度的提高蠕变孔洞的平均尺寸和面积百分比均明显增大。与未预应变的F316不锈钢相比,具有高密度孪晶的一级应变硬化F316不锈钢具有更大的蠕变抗力。分别基于Larson-Miller 参数法和θ参数法外推计算了350℃/200 MPa下的蠕变寿命,θ参数法的拟合曲线与实际蠕变曲线吻合得较好。根据Larson-Miller参数法和θ参数法,探讨了350℃/200 MPa下一级应变硬化F316奥氏体不锈钢长期服役蠕变可靠性。

关键词 ：金属材料, F316奥氏体不锈钢, 蠕变, Larson-Miller参数法, θ参数法

Abstract：

Creep properties of the pre-deformed F316 stainless steel by 200 MPa at 650℃, 670℃ and 700℃ were investigated. Results show that by a constant tensile stress of 200 MPa, the time to rupture of the pre-deformed F316 stainless steel decreases, while the steady creep rate and the instantaneous creep strain increase with increasing creep temperature. Ductile fracture is the dominant rupture mode for the pre-deformed F316 stainless steel. Creep cavities are mainly located in the triple junctions of grain boundaries, and the average diameter and the area ratio of the voids decrease in the location with the increasing distance to the fracture surface. In the region with the same distance to the fracture surface, the average diameter and area percentage of the voids increase obviously with the increasing creep temperature. The present pre-deformed F316 stainless steel with high density of twins has a better creep resistance than that of non-pre-deformed ones. Time to rupture by 200 MPa at 350℃ was estimated by using the Larson-Miller and θ-projection methods, respectively. The results show that the θ-projection method can give a better correlation. Besides, the long-term creep reliability of the F316 stainless steel served by 200 MP at 350℃ was discussed based on the Larson-Miller and θ-projection methods.

Key words： metallic materials F316,austenite stainless steel creep properties Larson-Miller parameter method θ-projection method

收稿日期: 2018-11-27

ZTFLH:

TG142.71

基金资助:国家科技重大专项(2013ZX06002-002);国家自然科学基金(51771207);国家自然科学基金(51671050)

作者简介: 王冬颖,女,1975年生,硕士

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https://www.cjmr.org/CN/10.11901/1005.3093.2018.677 或 https://www.cjmr.org/CN/Y2019/V33/I7/497

图1 一级应变硬化F316奥氏体不锈钢的原始态照片

图2 一级应变硬化F316奥氏体不锈钢在恒应力为200 MPa、温度分别为650℃、680℃和700℃条件下的蠕变应变-时间曲线和蠕变应变速率-时间曲线

表1 一级应变硬化F316奥氏体不锈钢在恒应力200 MPa,温度分别在650℃、680℃和700℃条件下的蠕变性能

图3 在恒应力为200 MPa不同温度下蠕变样品断口的SEM照片

图4 恒应力为200 MPa、不同温度蠕变断裂后样品表面的显微组织

图5 预变形态和未变形态F316不锈钢蠕变数据的比较

图6 在恒应力为200 MPa不同温度下蠕变断裂后的显微组织TEM照片

表2 两个温度下的蠕变曲线拟合得到的θi参数

表3 应力为200 MPa时所对应的Ai、Bi值

表4 预测得到的680℃、200 MPa蠕变曲线θi参数

表5 预测得到的350℃、200 MPa蠕变曲线θi参数

图7 用θ参数法预测的200 MPa、两种温度蠕变曲线与实际曲线的比较

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