通过调整冶炼工艺,研究钢中氧化钛和氮化钛的数量、尺寸及分布规律,并利用热力模拟试验机对试验钢的大热输入焊接热影响区韧性进行分析。试验结果表明：实施新的冶炼工艺能够使钢中形成大量细小的氧化钛和氮化钛类夹杂物;在熔合线部位温度为1 400℃时,钢中的TiN因溶解而失去钉扎作用。尺寸小于5μm的含Ti2O3和MnS的复合夹杂物,其形成IAF的能力强;尺寸为5～6μm的这类夹杂物具有IPF的形核能力。新的冶炼工艺能够大幅度提高大热输入焊接热影响区韧性。
Quantities,sizes and distribution of titanium oxide and nitride in steels obtained by different smelting processes were investigated.Toughness in heat-affected zone(HAZ) of tested steels was researched through thermal-mechanical simulation machine.The results show that numerous finely titanium oxide and nitride inclusions were acquired by a new smelting process.TiN inclusions in fusion line were dissolved in matrix when heated above 1 400 ℃,and then the pinning grain boundaries and inhibiting grain growth effects of TiN inclusions disappear.When the size of Ti2O3-MnS complex inclusions is less than 5 μm,these inclusions have a strong effect on promoting the formation of intragranular acicular ferrites(IAF).When the size is larger than 5-6 μm,some these inclusions also can promote the formation of intragranular polygonal ferrite(IPF).The toughness of steel in HAZ with high heat input can be improved by the new smelting process.
参考文献
| [1] | 児島明彦;清瀬明人;植森龍治 .微細粒子によるHAZ細粒高靭化技術"HTUFF"の開発[J].新日鉄技報,2004(380):2-5. |
| [2] | 尹桂全;高甲生;洪永昌 等.微量Nb对微Ti钢焊接HAZ奥氏体晶粒长大的影响[J].焊接学报,199,19(01):13. |
| [3] | Koda Munetaka .Relation Between Solution Behavior of TiN Particles and Austenite Grain Size in Synthetic HAZ(Proper ties of Iron and Steel)[J].Tetsu To Hagane-Journal of the Iron & Steel Institute of Japan,1984,70(13 s):1265. |
| [4] | Kasamatsu Yutaka .Effect of Titanium and Nitrogen on Toughness of Heat-Affected Zone of Steel Plate With Tensile Strength of 50 kg/mm2 in High Heat Input Welding[J].Tetsu To Hagane-Journal of the Iron and Steel Institute of Japan,1979,65(08):1232. |
| [5] | Yamamoto K.;Hasegawa T. .Effect of Boron on Intra-granular Ferrite Formation in Ti-Oxide Bearing Steels[J].ISIJ International,1996(1):80-86. |
| [6] | J.-H. SHIM;Y. W. CHO .NUCLEATION OF INTRAGRANULAR FERRITE AT Ti2O3 PARTICLE IN LOW CARBON STEEL[J].Acta materialia,1999(9):2751-2760. |
| [7] | Ishikawa F;Takahashi F .The Formation of Intragranuiar Ferrite Plates in Medium Carbon Steels for Hot Forging and Its Effect on the Toughness[J].ISIJ International,1995,35(11):1128. |
| [8] | Madariaga I.;Gutierrez I. .Role of the particle-matrix interface on the nucleation of acicular ferrite in a medium carbon microalloyed steel[J].Acta materialia,1999(3):951-960. |
| [9] | Lee Jye-Long .Evaluation of the Nucleation Potential of ln-tragranular Acicular Ferrite in Steel Weldments[J].Acta Metallurgiea et Materialia,1994,42(10):3291. |
| [10] | Jirr lehi Takamura;Shozo Mizoguchi.Roles of Oxides in Steel Performance[A].Nagoya,ISIJ,1990:591. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%