摘要
以钛粉、钒铁粉、铬铁粉、钼铁粉、铁粉及石墨粉为原料,在真空烧结炉中原位合成了(Ti,V)C钢结硬质合金。研究了(Ti,V)C钢结硬质合金的热处理组织及力学性能。结果表明,该钢结硬质合金在1000℃淬火后的组织为片状马氏体+(Ti,V)C硬质相颗粒+少量未溶碳化物;经1000℃淬火+500℃回火时发生二次硬化现象,硬度达86 HRA左右,抗弯强度达1540MPa,其断口形貌为硬质相解理、基体准解理及韧窝;经1000℃淬火+250℃回火、1000℃淬火+500℃回火后该硬质合金的耐磨性分别是经深冷处理高铬铸铁的3.8和3.5倍,其磨损机理是基体形变磨损和硬质相脱落。
（Ti,V）C steel bonded carbides were prepared by in situ sintering of mixture of titanium powder,ferrovanadium powder,graphite powder,molybdenum-iron powder,ferrochromium powder and iron powder in vacuum furnace.The microstructure and properties of（Ti,V）C steel bonded carbides after heat treatment were studied.The results show that the microstructure of the alloys quenched from 1000 ℃ is lamellar martensite,（Ti,V）C carbides plus a bit of undissolved carbides.Secondary hardening could be occured when the alloy was quenched at 1000 ℃and tempered at 500 ℃,the hardness and bending strength reach 86 HRA and 1540 MPa,respectively.The main fractographic appearances are（Ti,V）C cleavage,quasi-cleavage and dimples of matrix.The wear resistance of the alloy after quenched at 1000 ℃and tempered at 250 ℃or 500 ℃ is 3.8 or 3.5 times compared with that of high chromium cast iron after cryogenic treatment,the main wear mechanism is the peel off of the carbides and the deformation wear of the matrix.
出处
《金属热处理》
CAS
CSCD
北大核心
2010年第6期13-17,共5页
Heat Treatment of Metals
基金
西南科技大学青年基金(08zx3145)
