双金属液-固复合工艺对界面层影响的研究
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摘要
本文主要从铸件浇注位置、钢液浇注厚度两个方面,探讨了在铸造过程中工艺因素对复合界面层结合程度和不同区域组织性能的影响。实验结果表明:铸件浇注位置由竖直改为水平,能有效防止部分铸铁层被高温钢水熔透;浇注钢液厚度35 mm时,复合界面的结合区组织致密,达到冶金结合状态,无夹渣等缺陷;铸钢侧组织为珠光体+铁素体,高铬铸铁侧组织为铬奥氏体加少量M7C3碳化物。硬度测试表明:结合区显微硬度介于两金属硬度值之间,硬度的梯度变化有利于改善使用过程中受力状态,避免结合部位发生断裂。
In this paper,the effects of process factors on the degree of composite interface bonding and microstructure of different regions during the casting process are discussed from the aspects of casting casting position and molten steel casting thickness. The experimental results show that the cast position of the casting is changed from vertical to horizontal,which can effectively prevent some cast iron layers from being penetrated by high temperature steel. When the thickness of molten steel is 35 mm,the joint area of the composite interface is dense,metallurgical bonding state,no slag inclusion,etc. Defects;the side of the cast steel is pearlite +ferrite,and the side of the high chromium cast iron is chromium austenite + a little M7 C3 carbide. The hardness test shows that the microhardness of the bonding zone is between the hardness values of the two metals,and the gradient of the hardness is beneficial to improve the stress state during use and avoid the fracture of the bonding site.
In this paper,the effects of process factors on the degree of composite interface bonding and microstructure of different regions during the casting process are discussed from the aspects of casting casting position and molten steel casting thickness. The experimental results show that the cast position of the casting is changed from vertical to horizontal,which can effectively prevent some cast iron layers from being penetrated by high temperature steel. When the thickness of molten steel is 35 mm,the joint area of the composite interface is dense,metallurgical bonding state,no slag inclusion,etc. Defects;the side of the cast steel is pearlite +ferrite,and the side of the high chromium cast iron is chromium austenite + a little M7 C3 carbide. The hardness test shows that the microhardness of the bonding zone is between the hardness values of the two metals,and the gradient of the hardness is beneficial to improve the stress state during use and avoid the fracture of the bonding site.
引文
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[7]张圳炫,荣守范,刘会,杨鹏辉,朱永长.双液金属铸焊抛料头的制备与界面研究[J].铸造,2018(8):678-682.
[8]朱永长,魏尊杰,荣守范,等.双液金属复合耐磨板厚度对复合层组织和性能的影响[J].材料工程,2016,44(8):17-22.
[9]荣守范.液-液复合铸造双金属锤头及复合界面形成机理的研究[G]//2013年中国铸造活动周论文集.北京:中国机械工程学会,2013:207-212.
[2]刘娟娟.双金属固—液复合有限元模拟[D].东北大学,2011.
[3]刘清梅,吴振卿,关绍康.高铬铸铁和中碳钢复合界面结合情况分析[J].铸造设备研究,2002(6):27-29.
[4]李继文,张国赏,魏世忠,徐流杰.双金属液-液复合耐磨板锤的工艺研究[J].铸造,2010,59(3):300-303.
[5]刘清梅,吴振卿,关绍康.高铬铸铁和中碳钢复合界面结合情况分析[J].铸造设备研究,2002(6):27-29.
[6]朱永长.液/半固态双金属铸造复合耐磨薄板界面层组织及形成机制[D].哈尔滨:哈尔滨工业大学,2017.
[7]张圳炫,荣守范,刘会,杨鹏辉,朱永长.双液金属铸焊抛料头的制备与界面研究[J].铸造,2018(8):678-682.
[8]朱永长,魏尊杰,荣守范,等.双液金属复合耐磨板厚度对复合层组织和性能的影响[J].材料工程,2016,44(8):17-22.
[9]荣守范.液-液复合铸造双金属锤头及复合界面形成机理的研究[G]//2013年中国铸造活动周论文集.北京:中国机械工程学会,2013:207-212.