带夹层材料的爆炸-轧制钛钢复合板工艺研究

Titanium Cladding Steel Plates with Interlayer by Explosion and Rolling Bonding

摘要:

为扩大钛-钢复合板的尺寸，采用一种新颖的组料方式，这种方法包括两个主要步骤，首先用爆炸焊接的方式将DT4夹层与钛板结合，然后按照对称方式组坯。研究轧制温度、退火温度对复合板剪切强度的影响。利用扫描电镜、光学显微镜和显微硬度试验机对复合板的微观组织和界面附近硬度进行分析。结果表明：复合板的结合强度取决于轧制温度和轧后退火温度，当轧制温度超过钛的α→β相变温度，并且退火温度超过750 ℃时，Ti/DT4界面脆性化合物明显增多，剪切强度显著降低；当退火温度超过900 ℃，Fe在钛中扩散速度快，显微硬度的峰值在钛侧出现；在550~650 ℃退火，复合板的结合强度略有升高

Abstract:

In order to enlarge the dimensions of titanium cladding steel plate, a new method of two main procedures was used, in which the DT4 thin slice was exploded firstly with titanium plate to assemble billet according to a symmetrical way. The effects of rolling and annealing temperatures on the shear strength of titanium cladding steel plate were investigated. The microstructures and interfacial diffusion of the cladding plates were observed or measured by optical microscope, scanning electric microscope and micro-hardness tester. The results show that the shear strength of the cladding plates is remarkably depended on the rolling and annealing temperatures, and the brittle compound amount in the interface of titanium/DT4 will increase evidently and the shear strength of titanium cladding steel plate will decrease sharply when the rolling temperature is above 882 ℃ (the α→β phase transformation temperature of titanium), or the annealing temperature is above 750 ℃. The micro-hardness peak value appears in titanium side when the annealing temperature is higher than 900 ℃ due to Fe element diffusion in titanium. Annealed within the range from 550 to 650 ℃, the shear strength will slightly increase.