变形温度对应变强化深冷容器用S30408不锈钢组织结构演化的影响*

doi:10.11901/1005.3093.2014.204

材料研究学报

2014, Vol. 28

Issue (9): 682-688 DOI: 10.11901/1005.3093.2014.204

本期目录 | 过刊浏览

变形温度对应变强化深冷容器用S30408不锈钢组织结构演化的影响*

张颖¹,高晓哲²,张滨¹(

),宋竹满³,郑津洋²,张广平³

1. 东北大学材料各向异性与织构教育部重点实验室沈阳 110819
2. 浙江大学化工机械研究所杭州 310027
3. 中国科学院金属研究所沈阳材料科学国家(联合)实验室沈阳 110016

Effect of Deformation Temperature on Microstructure Evolution of S30408 Austenitic Stainless Steel for Cold-stretching Cryogenic Vessels

Ying ZHANG¹,Xiaozhe GAO²,Bin ZHANG^1,^**(

),Zhuman SONG³,Jinyang ZHENG²,Guangping ZHANG³

1. Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, Shenyang 110819
2. Institute of Process Equipment, Zhejiang University, Hangzhou 310027
3. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

引用本文:

张颖,高晓哲,张滨,宋竹满,郑津洋,张广平. 变形温度对应变强化深冷容器用S30408不锈钢组织结构演化的影响*[J]. 材料研究学报, 2014, 28(9): 682-688.
Ying ZHANG, Xiaozhe GAO, Bin ZHANG, Zhuman SONG, Jinyang ZHENG, Guangping ZHANG. Effect of Deformation Temperature on Microstructure Evolution of S30408 Austenitic Stainless Steel for Cold-stretching Cryogenic Vessels[J]. Chinese Journal of Materials Research, 2014, 28(9): 682-688.

全文: PDF(3177 KB) HTML

摘要:

对经9%预变形、在不同低温条件下拉伸变形后的深冷容器用应变强化S30408奥氏体不锈钢进行一系列的微观组织结构表征, 研究了变形温度对其组织结构演变的影响。结果表明: 9%预变形后在1.0×10^-3/s应变速率下在-60℃和-196℃的拉伸变形促进了S30408不锈钢发生从γ奥氏体向α'-马氏体的转变, 拉伸温度越低转变量越多、板条越细; 同时, 随着拉伸温度的降低S30408不锈钢的显微硬度值升高。低温拉伸形变诱发S30408奥氏体不锈钢马氏体相变, 其α'-马氏体与基体γ奥氏体的位向关系为{111}γ∥{011}α', <101>γ∥<111>α', 符合K-S关系。

关键词 ：金属材料, 奥氏体不锈钢, 深冷容器, 应变强化, 变形温度, 相变

Abstract：

Tensile tests of the 9% pre-strained S30408 austenitic stainless steel for cryogenic vessels were conducted at different cryogenic temperatures. Microstructures of the fractured specimens were examined. The results show that the phase transformation from γ-austenite to α'-martensite in the 9% pre-strained S30408 austenitic stainless steel was promoted under tensile deformation with a strain rate of 1.0×10^-3/s at cryogenic temperatures. The lower the temperature at which tensile testing was performed, the more the amount of the phase transformation from γ into α', and the finer the martensite lath. The martensite transformation can be induced by the deformation of austenite, and the interface relationship between the α'-martensite and the γ-austenite phases is {111}γ∥{011}α' and <101>γ∥<111>α', which is in accord with the K-S model.

Key words： metallic materials austenitic stainless steel cryogenic pressure vessels strain-strengthening deformation temperature phase transformation

收稿日期: 2014-04-22

基金资助:* 国家自然科学基金51171045、51371047和51371180资助项目。

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https://www.cjmr.org/CN/10.11901/1005.3093.2014.204 或 https://www.cjmr.org/CN/Y2014/V28/I9/682

表1 S30408奥氏体不锈钢的化学成分(质量分数, %)

图1 不同处理条件下S30408样品的显微硬度值

图2 原始态及经9%预应变试样和9%预应变后在不同温度下拉断后S30408不锈钢试样的XRD衍射图谱

图3 原始态、经9%预应变及不同温度下30408 不锈钢拉伸断裂后试样中α'-bcc 马氏体和ε-fcc奥氏体的体积百分含量的理论计算结果

图4 不同温度拉伸断裂的304 不锈钢样品的TEM观察与选区电子衍射分析(a) 20℃(入射电子束方向为[013]), (b) -60℃(入射电子束方向为), (c) -196℃(入射电子束方向为[014])和(d) -196℃

图5 原始试样、9%预变形试样及不同温度下拉伸样品断口附近的EBSD表征(a) 原始, (b) 9%预变形, (c) 20℃, (d) -60℃, (e) -196℃

表2 晶体学取向的计算

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