微合金化高碳77B盘条钢的组织与性能
|
摘要
利用热模拟试验机、万能试验机和光学显微镜对不同微合金化处理后高碳77B盘条钢的变形温度和冷却速度进行了研究。实验结果表明:钒微合金化和钒氮微合金化均能细化珠光体组织,提高77B钢的强度,且钒氮微合金化的作用更大,但也更易形成先共析铁素体,钒和氮的添加上限分别约为0.08%和0.012%;77B盘条钢中单独加铬对抗拉强度有小幅提升,但钒、氮、铬同时加入时会极大恶化塑性,铬合金化不是77B盘条的强化方向。钒氮微合金化77B钢的最佳生产工艺为:变形温度900～920℃;终冷速度1～2℃/s。
The deformation temperature and cooling rate of different microalloying high carbon 77 B steel rods were studied by thermal simulator, universal test machine and optical microscope. The results show that vanadium microalloying and vanadium nitrogen microalloying can both refine pearlite structure and improve the strength of 77 B steel rods, and vanadium nitrogen microalloying is more effective, but it is easier to form pre eutectoid ferrite. The upper limit of adding vanadium and nitrogen is about 0.08% and 0.012%, respectively. The tensile strength of 77 B wire rods is increased slightly by adding chromium alone. However, when vanadium, nitrogen and chromium combined addition, it will greatly deteriorate plasticity. Chromium alloying is not the strengthening direction of 77 B wire rods. The best test production process of vanadium nitrogen microalloyed 77 B steel rods is rolling at 900～920 ℃ with the cooling speed at 1～2 ℃/s.
The deformation temperature and cooling rate of different microalloying high carbon 77 B steel rods were studied by thermal simulator, universal test machine and optical microscope. The results show that vanadium microalloying and vanadium nitrogen microalloying can both refine pearlite structure and improve the strength of 77 B steel rods, and vanadium nitrogen microalloying is more effective, but it is easier to form pre eutectoid ferrite. The upper limit of adding vanadium and nitrogen is about 0.08% and 0.012%, respectively. The tensile strength of 77 B wire rods is increased slightly by adding chromium alone. However, when vanadium, nitrogen and chromium combined addition, it will greatly deteriorate plasticity. Chromium alloying is not the strengthening direction of 77 B wire rods. The best test production process of vanadium nitrogen microalloyed 77 B steel rods is rolling at 900～920 ℃ with the cooling speed at 1～2 ℃/s.
引文
[1]林秀山,蒋永康,孙金茂.加速预应力钢丝钢绞线用盘条的国产化进程[J].上海金属,2010,22(1):53-58.
[2]陈伟庆,冯军.高强度预应力钢绞线用盘条的质量控制[J].金属制品,2005,31(5):14-17.
[3]夏艳花,沈金龙.钒在高碳钢盘条中的应用研究[J].武汉工程职业技术学院学报,2010,22(2):5-9.
[4]赵文成,闫亚坤,王云阁,等.热轧高碳盘条77B生产工艺与组织性能[J].热加工工艺,2011,40(16):190-191.
[5]杨峰,梁益龙,向嵩,等.热处理工艺对SWRS82B盘条显微组织的影响[J].热加工工艺,2012,41(18):173-176.
[6]王冠军,杨建玺,王武军,等.冷却速率对82B盘条相变规律影响的研究[J].材料研究与应用,2011,05(4):283-286.
[2]陈伟庆,冯军.高强度预应力钢绞线用盘条的质量控制[J].金属制品,2005,31(5):14-17.
[3]夏艳花,沈金龙.钒在高碳钢盘条中的应用研究[J].武汉工程职业技术学院学报,2010,22(2):5-9.
[4]赵文成,闫亚坤,王云阁,等.热轧高碳盘条77B生产工艺与组织性能[J].热加工工艺,2011,40(16):190-191.
[5]杨峰,梁益龙,向嵩,等.热处理工艺对SWRS82B盘条显微组织的影响[J].热加工工艺,2012,41(18):173-176.
[6]王冠军,杨建玺,王武军,等.冷却速率对82B盘条相变规律影响的研究[J].材料研究与应用,2011,05(4):283-286.