ZG30Cr06A钢焊接工艺性及接头的力学性能研究

采用气体保护焊(GMAW)对30 mm的煤矿机械液压支架的柱窝材料ZG30Cr06A板进行了斜Y型坡口焊接裂纹试验和对接焊试验,研究了ZG30Cr06A钢的焊接工艺性和焊接接头的力学性能。结果显示,在室温条件下进行斜Y型坡口裂纹试验,裂纹率达100%;随着预热温度的增大,裂纹率逐渐降低,在预热温度为100℃及以上时,不会出现冷裂纹。在预热温度为150℃,对ZG30Cr06A钢板进行对接焊,焊缝未发现裂纹。对焊接接头进行拉伸性能、弯曲性能和冲击性能试验,各项性能均满足要求。

Development of 30Cr06A,a high strength cast steel and its welding ability

High performance hydraulic supports have a high requirement in strength,toughness and welding ability of socket mate- rial.Targeting this problem,we analyzed the properties of the high strength socket material 30Cr06,used in high performance hy- draulic supports both at home and abroad and developed a new kind of high strength cast steel 30Cr06A,by making use of an or- thogonal experiment,which provided the design conditions for its optimal composition.The result shows that the strength and toughness of the newly developed high strength cast steel 30Cr06A is much better than that of 30Cr06.Theoretical calculations,mechanical property tests and hardness distribution tests of welded joints were carried out for a study of the welding ability of the new material,which is proved to be very good.Therefore,this 30Cr06A material has been successfully used in the socket of high performance hydraulic support.

ZG30Cr06A热物性参数的测定及在铸造CAE中的应用

应用射线吸收、激光脉冲等方法测定了新型合金ZG30Cr06A的热物性参数,并应用MAGMAsoft和ABAQUS等CAE软件对该材质柱窝零件铸造工艺进行了优化设计以及应力分布分析。CAE模拟分析结果与生产实际吻合。

矿用液压支架高性能柱窝铸造与锻造成形方法比较分析

柱窝是液压支架的关键受力件之一,其必须具有良好的综合性能才能适应井下恶劣的工作环境。为了提高柱窝在服役过程中的安全可靠性,分析柱窝的结构,对铸造和锻造生产工艺进行对比分析,肯定锻造柱窝的优势,对比研究柱窝常用原材料的综合力学性能及焊接性,使用ZG30Cr06A方形铸坯进行锻造试验,研究锻坯对锻后综合力学性能的影响。结果表明:行业内柱窝的原材料焊接性均较差,推荐焊前进行150~200℃预热,相较于常用材质27SiMn钢、30CrMo钢、42CrMo钢和ZG30Cr06A,27CrNiMo钢具有更好的韧度,原材料选用使用热轧或锻制圆钢,保证锻制比,理论上可以有效提高柱窝的综合力学性能,更适用于大阻力、恶劣工况下服役的液压支架。

ZG30Cr06E的焊接性分析研究

对煤矿机械液压支架中新研制的抗拉强度高达800MPa柱窝材料ZG30Cr06E的焊接性进行了研究。采用热影响区最高硬度试验、斜Y型坡口裂纹试验测试了该钢对冷裂纹的敏感性,并研究了不同焊接工艺条件下焊接接头组织转变和性能变化规律。结果表明,在室温下焊接时,其热影响区最高硬度值达387HV,有一定的淬硬倾向,冷裂纹的敏感性大,焊接过程中应采取措施防止冷裂纹的产生;焊接工艺参数对焊接接头组织和性能均有一定的影响,为确保焊接质量,焊接时要采用合适的预热温度,并控制焊接线能量和焊道间温度。