中国有色金属学报
中國有色金屬學報
중국유색금속학보
THE CHINESE JOURNAL OF NONFERROUS METALS
2014年
9期
2322-2332
,共11页
姜雁斌%刘贤钙%张小军%谢建新
薑雁斌%劉賢鈣%張小軍%謝建新
강안빈%류현개%장소군%사건신
BFe10-1-1管材%热冷组合铸型%水平连铸%热阻%组织均匀性
BFe10-1-1管材%熱冷組閤鑄型%水平連鑄%熱阻%組織均勻性
BFe10-1-1관재%열랭조합주형%수평련주%열조%조직균균성
BFe10-1-1 tube%heating-cooling combined mold%horizontal continuous casting%thermal resistance%microstructure homogeneity
提出在结晶器冷型底部设置气隙热阻以提高热冷组合铸型(HCCM)水平连铸 BFe10-1-1管材周向组织和力学性能均匀性的方法,研究热阻角对连铸传热行为、管材周向组织和力学性能均匀性的影响。结果表明:未设置热阻时,管材上部和下部组织均由“V”形柱状晶组成,侧部组织为与轴向呈夹角29°~36°的柱状晶,周向的柱状晶形貌和数量分布不均匀,其周向不同部位的抗拉强度和断后伸长率差异较大。当热阻角为8°~32°时,随热阻角的增大,管材柱状晶组织与轴向的夹角减小,周向组织和力学性能的均匀性提高。在本实验条件下,BFe10-1-1管材HCCM水平连铸结晶器冷型底部设置合理的热阻角为32°。冷型底部设置热阻使管材周向传热及凝固区周向温度场分布更为均匀,这是管材周向组织和力学性能均匀性提高的主要原因。
提齣在結晶器冷型底部設置氣隙熱阻以提高熱冷組閤鑄型(HCCM)水平連鑄 BFe10-1-1管材週嚮組織和力學性能均勻性的方法,研究熱阻角對連鑄傳熱行為、管材週嚮組織和力學性能均勻性的影響。結果錶明:未設置熱阻時,管材上部和下部組織均由“V”形柱狀晶組成,側部組織為與軸嚮呈夾角29°~36°的柱狀晶,週嚮的柱狀晶形貌和數量分佈不均勻,其週嚮不同部位的抗拉彊度和斷後伸長率差異較大。噹熱阻角為8°~32°時,隨熱阻角的增大,管材柱狀晶組織與軸嚮的夾角減小,週嚮組織和力學性能的均勻性提高。在本實驗條件下,BFe10-1-1管材HCCM水平連鑄結晶器冷型底部設置閤理的熱阻角為32°。冷型底部設置熱阻使管材週嚮傳熱及凝固區週嚮溫度場分佈更為均勻,這是管材週嚮組織和力學性能均勻性提高的主要原因。
제출재결정기랭형저부설치기극열조이제고열랭조합주형(HCCM)수평련주 BFe10-1-1관재주향조직화역학성능균균성적방법,연구열조각대련주전열행위、관재주향조직화역학성능균균성적영향。결과표명:미설치열조시,관재상부화하부조직균유“V”형주상정조성,측부조직위여축향정협각29°~36°적주상정,주향적주상정형모화수량분포불균균,기주향불동부위적항랍강도화단후신장솔차이교대。당열조각위8°~32°시,수열조각적증대,관재주상정조직여축향적협각감소,주향조직화역학성능적균균성제고。재본실험조건하,BFe10-1-1관재HCCM수평련주결정기랭형저부설치합리적열조각위32°。랭형저부설치열조사관재주향전열급응고구주향온도장분포경위균균,저시관재주향조직화역학성능균균성제고적주요원인。
A method of setting air-gap thermal resistance at the bottom of cooling mold was proposed to improve the homogeneity of circumferential microstructure and mechanical properties of BFe10-1-1 cupronickel tube produced by heating-cooling combined mold (HCCM) horizontal continuous casting. The influences of thermal-resistance angle on the heat transfer during continuous casting, circumferential microstructure and mechanical properties of the tube were investigated. The results show that for non-thermal resistance, the tube mainly consists of“V”type columnar grains at both the upper and lower parts, and axial columnar grains whose growth direction has an angle of 29°-36° to the axial direction at the lateral part. The morphology and number of the columnar grains at circumference of the tube are inhomogeneous, which induces apparent inhomogeneity of the tensile strength and elongation to failure of the tube. For the thermal-resistance angle of 8°-32°, with increasing the thermal-resistance angle, the angle between the columnar grain and the axial direction decreases, and the homogeneity of circumferential microstructure and mechanical properties of the tube is improved. The appropriate thermal-resistance angle at the bottom of cooling mold for BFe10-1-1 cupronickel tube is 32°. Setting air-gap thermal resistance at the bottom of cooling mold improves the homogeneity of both circumferential heat transfer and temperature filed in the solidified zone of the tube during HCCM horizontal continuous casting, which is mainly responsible for enhancing the homogeneity of microstructure and mechanical properties of BFe10-1-1 cupronickel tube.