2205和2507双相不锈钢双道次热压缩条件下的微观组织演变及变形行为*

doi:10.11901/1005.3093.2016.410

材料研究学报

2016, Vol. 30

Issue (12): 888-896 DOI: 10.11901/1005.3093.2016.410

本期目录 | 过刊浏览

2205和2507双相不锈钢双道次热压缩条件下的微观组织演变及变形行为*

王立新¹,李花兵²,李国平¹,唐正友³(

),马明³

1. 山西太钢不锈钢股份有限公司太原 030003
2. 东北大学冶金学院沈阳 110819
3. 东北大学材料科学与工程学院沈阳 110819

Microstructural Evolution and Flow Behavior of 2205 and 2507 Duplex Stainless Steel during Double Pass Hot Compressive Deformation

Lixin WANG¹,Huabing LI²,Guoping LI¹,Zhengyou TANG^3,^*(

),Ming MA³

1. Shanxi Taigang Stainless Steel Co Ltd, Taiyuan 030003, China
2. School of Metallurgy, Northeastern University, Shenyang 110819, China
3. School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China

引用本文:

王立新,李花兵,李国平,唐正友,马明. 2205和2507双相不锈钢双道次热压缩条件下的微观组织演变及变形行为*[J]. 材料研究学报, 2016, 30(12): 888-896.
Lixin WANG, Huabing LI, Guoping LI, Zhengyou TANG, Ming MA. Microstructural Evolution and Flow Behavior of 2205 and 2507 Duplex Stainless Steel during Double Pass Hot Compressive Deformation[J]. Chinese Journal of Materials Research, 2016, 30(12): 888-896.

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摘要:

对DSS2205和SDSS2507进行1000~1200℃的双道次热压缩实验, 以研究热变形道次间隔过程中双相不锈钢的微观组织演变及其对合金后续变形行为的影响。结果表明: 较高的变形温度(1200℃)不利于奥氏体稳定。随着保温时间的延长, γ→δ相变使得奥氏体占比逐渐降低, 亚稳铁素体再结晶晶粒明显长大, 合金第二道次热变形时的流变应力水平逐渐降低。在较低的变形温度下(1000℃), δ→γ相变占据主导, 保温时间的延长促使铁素体晶界处形成大量的块状奥氏体相, 抑制了铁素体再结晶晶粒长大。合金在第二道次热压缩变形时, 块状奥氏体相的形成致使铁素体内大量位错发生缠结, 并聚集在奥氏体/铁素体相界面处。对比DSS2205和SDSS2507较低温度下的微观组织演变过程可知, 双相不锈钢第二道次变形抗力的提高主要与保温过程中铁素体内块状奥氏体相的形成有关。

关键词 ：金属材料, 双相不锈钢, 热变形, 双道次热压缩, 流变应力, 静态软化

Abstract：

Double passes hot compression tests of DSS2205 and SDSS2507 were conducted in order to investigate the microstructural evolution in the interval of hot deformation and its corresponding effect on the subsequent flow behavior of duplex stainless steels. The results indicated that, the higher deformation temperature(1200℃) decreased the stability of the austenite. As the holding time increased, the growth of ferritic recrystallized grains could be observed and the occurrence of γ→δ decreased the phase proportion of the austenite, which caused that the flow stress of DSSs in the second pass of hot compression decreased. In a lower temperature(1000℃), δ→γ became dominant and a large number of granular austenite formed in the grain boundary of the ferrite when the holding time increased and the growth of ferritic recrystallized grains was inhibited. During the second pass of compression, dislocations in the ferrite tangled around the phase boundaries between two phases due to the formation of granular austenite. Compared with the microstructural evolutions of DSS2205 and SDSS2507 at lower temperature, it was known that the increase of deformation resistance in the second pass deformation of DSSs was mainly related to the formation of the granular austenite.

Key words： metallic materials duplex stainless steel thermal deformation double passes hot compression flow stress static softening

收稿日期: 2016-07-19

基金资助:* 国家科技支撑计划项目(2012BAE04B01),国家高技术研究发展计划(863)(2015AA034301),中央高校基本科研业务费专项资金资助项目(N150204007, L1502034)和国家自然科学基金项目(51574077)

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https://www.cjmr.org/CN/10.11901/1005.3093.2016.410 或 https://www.cjmr.org/CN/Y2016/V30/I12/888

表1 实验钢化学成分(质量分数, %)

图1 DSS2205及SDSS2507合金第一道次变形后不同保温时间下的微观组织

图2 不同温度及保温时间下DSS2205 and SDSS2507合金中奥氏体相占比统计

图3 采用J-MAT Pro计算的DSS2205和SDSS2507合金的平衡相图

图4 DSS2205和SDSS2507合金在1000℃条件下保温100 s后的组织形貌

图5 DSS2205 和SDSS2507合金保温前后铁素体的金相组织

图6 DSS2205不同温度下保温100 s的透射组织分析

图7 DSS2205和SDSS2507双道次热压缩应力-应变曲线

图8 DSS2205和SDSS2507合金保温过程中的静态软化率

图9 两种合金两道次变形过程中的变形抗力比

图10 1000℃/100 s条件下DSS2205第二道次变形后的微观组织

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