奥氏体不锈钢Cr17Mn6Ni4Cu2N铸坯壳层和心部的组织及热塑性
Microstructure and Hot Ductility of Austenitic Stainless Steel Cr17Mn6Ni4Cu2N in Slab Shell and Core
摘 要
在奥氏体不锈钢Cr17Mn6Ni4Cu2N铸坯壳层和心部分别制取拉伸试样, 并在Thermorestor-W型热/力模拟试验机上进行高温拉伸试验, 研究了铸坯壳层和心部的热塑性及对应的微观组织。结果表明: 随着试验温度的升高, 壳层和心部试样的热塑性均先升后降, 在1 250 ℃时达到最高;壳层的显微组织为细小的树枝晶, 热塑性较高, 变形时开裂位置位于铁素体树枝晶的枝干处;心部为胞状奥氏体上分布着网状δ铁素体, 热塑性较差, 变形时易在胞状奥氏体处产生裂纹;在热变形过程中, 心部的胞状奥氏体比壳层的树枝晶更易产生裂纹, 从而导致心部的热塑性较差。
铸坯壳层
铸坯心部
胞状奥氏体
树枝晶
austenitic stainless steel
slab shell
slab core
cellular austenite
dendrite crystal
Abstract
Tensile specimens were cut from austenitic stainless steel Cr17Mn6Ni4Cu2N slab shell and core, and high temperature tensile tests were carried out on Thermorestor-W thermodynamic simulation tester to study microstructure and hot ductility. The results show that, the hot ductility in shell and core increasd with the increase of deformation temperature, and reachd the maximum at 1 250 ℃. The hot ductility of the slab shell was well, and its microstructure was fine dendrite, cracking were located in limb of ferrite dendrite. In slab core, the microstructure was composed of cellular austenitic and network ferrite, and its hot ductility was low, cracks were apt to appear in cellular austenitic. During the process of hot deformation, the cellular austenitic in slab core was easy to crack than dendrite crystal in slab shell, which leads to the low ductility in slab core.
中图分类号 TG142.71
所属栏目 试验研究
基金项目 国家自然科学基金资助项目(51264026)
收稿日期 2012/9/10
修改稿日期 2013/5/31
网络出版日期
作者单位点击查看
备注侯国清(1982-), 男, 河北沧州人, 博士研究生。
引用该论文: HOU Guo-qing,ZHU Liang,BIAN Hong-xia. Microstructure and Hot Ductility of Austenitic Stainless Steel Cr17Mn6Ni4Cu2N in Slab Shell and Core[J]. Materials for mechancial engineering, 2013, 37(9): 16～20
侯国清,朱亮,边红霞. 奥氏体不锈钢Cr17Mn6Ni4Cu2N铸坯壳层和心部的组织及热塑性[J]. 机械工程材料, 2013, 37(9): 16～20
被引情况:
【1】胡春文,王晓震,金建军, "工序间退火温度对0Cr21Ni6Mn9N奥氏体不锈钢管组织与性能的影响",机械工程材料 38, 33-36(2014)
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【2】BAYOUMI L S. Edge stress in wide strip hot rolling[J].International Journal of Mechanical Science, 1997, 39(4): 397-408.
【3】王新华, 朱国森, 于会香, 等. 高碳钢连铸板坯高温力学性能[J].北京科技大学学报, 2005, 27(5): 545-548.
【4】TASUO K, ISAO T, HIROSH O. Hot workability of austenitic stainless steels containing delta-ferrite[J].Kawasaki Steel Technical Report, 1986, 14(3): 50-60.
【5】ABDUL R S, VENKATA R N. Prediction of internal defects in plane strain rolling[J].Journal of Materials Processing Technology, 2005, 159(3): 409-417.
【6】石锋, 王立军, 崔文芳. Fe-18Cr-12Mn-0.55N 高氮奥氏体不锈钢的热塑性研究;EB/OL].;2012-07-10].http: //www.paper.edu.cn/index.php/default/releasepaper/content/200704-254.
【7】DI H S, CUI G Z, WANG D G. Hot ductility of 304HC stainless steel and the model of resistance to deformation[J].Acta Metallruigiga Sinica(English Letters), 2003, 16(2): 97-103.
【8】GUO W, ZHU M Y. Characteristic parameters for dendritic microstructure of solidification during slab continuous casting[J].Journal of Iron and Steel Research, 2009, 16(1): 17-21.
【9】张有余, 马蓉, 侯国清, 等. Cr17Mn6Ni4Cu2N奥氏体不锈钢连铸坯组织及凝固模式[J].兰州理工大学学报, 2009, 35(4): 15-18.
【10】TEHOVNIK F, VODOPIVEC F, LADISLAV K. Hot ductility of austenitic stainless steel with a solidification structure[J].Materiali in Tehnologije, 2006, 40(4): 129-137
【11】MINTZ B, SHAKER M, CROWTHER D N. Hot ductility of an austenitic and a ferrite stainless steel[J].Materials Science and Technology, 1997, 13(3): 243-249.
【12】侯国清, 朱亮, 马蓉, 等. 奥氏体不锈钢Cr15Mn9Cu2Ni1N连铸坯壳层的热塑性[J].材料科学与工艺, 2011, 19(1): 91-94.
【13】卞华康, 卫英慧, 王辉绵, 等.节镍型奥氏体不锈钢的高温塑性[J].机械工程材料, 2012, 36(3): 72-75.
【14】TEHOVNIK F, VODOPIVEC F, CELIN R. Effect of δ-ferrite, lead and sulphur on hot workability of austenitic stainless steels with solidification structure[J].Materials Science and Technology, 2011, 27(4): 774-782.
【15】钟正烨, 盛光敏. 200系奥氏体不锈钢热轧裂纹的产生原因及其工艺改进[J].机械工程材料, 2010, 34(4): 79-83.
【16】SALLER G, SPIRADEK-HAHN K, SCHEN C. Microstructural evolution of Cr-Mn-N austenitic steels during cold work hardening[J].Journal of Materials Science, 2006, 427(1/2): 246-254.
【17】TZANEVA B R, FACHIKOV L B, RAICHEFF R G. Pitting corrosion of Cr-Mn-N steel in sulphuric acid media[J].Journal of Applied Electrochemistry, 2006, 36(3): 347-353.
【18】FU J W, YANG Y S, GUO J J. Effect of cooling rate on solidification microstructures in AISI 304 stainless steel[J].Materials Science and Technology, 2008, 24(8): 941-944.
【19】BALDISSIN D, BARICCO M, BATTEZZATI L. Microstructures in rapidly solidified AISI 304 interpreted according to phase selection theory[J].Materials Science and Engineering A, 2007, 449/451: 999-1002.
【20】SCHINO A D, MECOZZI M G, BARTERI M. Solidification mode and residual ferrite in low-Ni austenitic stainless steels[J].Journal of Materials Science, 2000, 35: 375-380.
【21】LIPPOLD J C, KOTECK D J.不锈钢焊接冶金学及焊接性;M].陈剑宏, 译.北京: 机械工业出版社, 2008.
【22】梁高飞, 朱丽业, 王成全. AISI304不锈钢中δ→γ相变的原位观察[J].金属学报, 2007, 43(2): 119-124.
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