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材料研究学报  2013, Vol. 27 Issue (1): 65-69    
  研究论文 本期目录 | 过刊浏览 |
淬火工艺对中碳高硼铁合金显微组织和力学性能的影响*
鲍姚亮1, 2 蒋业华1, 2** 岑启宏1, 2 郭红星3
1. 昆明理工大学材料科学与工程学院 昆明 650093
2. 云南省先进成形制造工程技术研究中心 昆明 650093
3. 云南昆钢重型装备制造集团有限公司 昆明 650501
Effect of Quenching Process on Microstructure and Properties of Medium Carbon High Boron Iron-base Alloy
BAO Yaoliang1, 2 JIANG Yehua 1, 2** CEN Qihong1, 2 GUO Hongxing3
1. School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093
2. Research Center for Advanced Materials Processing of Yunan Province, Kunming 650093
3. Yunnan Kunsteel Heavy Equipment Manufacturing Group Co., LTD, Kunming 650501
引用本文:

鲍姚亮,蒋业华,** 岑启宏,郭红星. 淬火工艺对中碳高硼铁合金显微组织和力学性能的影响*[J]. 材料研究学报, 2013, 27(1): 65-69.
BAO Yaoliang, JIANG Yehua, ** CEN Qihong, GUO Hongxing. Effect of Quenching Process on Microstructure and Properties of Medium Carbon High Boron Iron-base Alloy[J]. Chinese Journal of Materials Research, 2013, 27(1): 65-69.

全文: PDF(7002 KB)  
摘要: 设计一种新型中碳高硼铁合金, 研究了淬火工艺对其淬火前后的显微组织和性能的影响。结果表明: 中碳高硼铁合金铸态组织由珠光体、硼碳化合物以及马氏体组成, 硼碳化合物以M23(B, C)6为主, 并含有少量M(B, C), M3(B, C)和M2(B, C), 体积分数为31.3%。在950 ℃、1000 ℃、1050 ℃和1100 ℃淬火, 其基体组织转变成马氏体, 并含有少量残余奥氏体, 体积分数分别为3.5%、4.0%、4.6%和5.4%。在950—1100 ℃淬火, 硼碳化合物的类型不变, 局部溶解, 出现断网现象, 在不同温度淬火后硼碳化合物的体积分数分别为30.6%、29.1%、27.3%和26.4%; 随着淬火温度的提高, 基体中合金元素的固溶量增加, 硼碳化合物逐渐减少, 从而减轻了对基体的割裂作用。淬火后, 中碳高硼铁合金的硬度和冲击韧性显著提高, 在950—1100 ℃淬火后, 冲击韧性提高, 硬度呈现先增加后减小的趋势。
关键词 金属材料中碳高硼铁合金硼碳化合物显微组织淬火硬度冲击韧性    
Abstract:ABSTRACT A type of medium carbon high boron iron-base alloy was designed, and the microstructure and property before and after quenching were investigated. The results show that the microstructure of the as-cast medium carbon high boron iron-base alloy consists of pearlite (P), martensite (M) and borocarbide. The volume fraction of borocarbide, which was mainly composed of M23(B, C)6, M(B, C), M3(B, C) and M2(B, C), was 31.3%. After quenched at the temperature of 950, 1000, 1050 and 1100 ℃, the matrix microstructure changed into martensite with a small amount of residual austenite content of 3.5%, 4.0%, 4.6% and 5.4% respectively. There was no change on borocarbide type, but the network pattern of borocarbide was broken because of partial dissolution. The volume fraction of borocarbide after quenching at the four temperatures were 30.6%, 29.1%, 27.3% and 26.4% respectively; With raising of quenching temperature, the amount of solid-solution alloy elements in matrix increased, and the borocarbide reduced gradually, therefore the separation effect to the matrix was reduced. The hardness and impact toughness of the alloy after quenching were significantly enhanced. After quenching at 950-1100 ℃, the hardness increased firstly and then decreased with quenching temperature, while the impact toughness consistently raised.
    
ZTFLH:  TG142  
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