论文部分内容阅读
准确地测定轴承钢中合金渗碳体的重量分数,并从而计算钢中的固溶碳量,对于热加工及热处理工艺以及其组织性能关系的研究具有重要的意义。目前一般都是采用物理化学相分析方法来测定轴承钢中合金渗碳体的重量分数。这种方法的程序为:电解、残渣分离、X射线相分析确定残渣仅为合金渗碳体、定量化学分析确定残渣中的Fe,Cr、Mn含量、计算合金渗碳体量及其中的C含量并从而计算出基体中的固溶C量。本文通过试验,初步确定了GCr15钢中合金渗碳体的化学组成式,这就能在化学分析时只分析Fe元素的含量,从而提高工作效率并达到准确性的要求。在此基础上,对于淬回火态试样,由于电解时合金渗碳体残渣一般都紧密地附在试样表面上而不会脱落,因而提出了干燥称重法,这就能完全省去残渣分离及化学分析两个步骤,进一步提高工作效率。
Accurately determining the weight fraction of cementite in the bearing steel and calculating the amount of dissolved carbon in the steel is of great significance for the study of the relationship between the heat treatment and the heat treatment process as well as the microstructure and properties. Currently, physical-chemical phase analysis is generally used to determine the weight fraction of cementite cementite in the bearing steel. The procedure of this method is as follows: electrolysis, residue separation, X-ray phase analysis to determine that the residue is only alloy cementite, quantitative chemical analysis to determine the content of Fe, Cr and Mn in the residue, and to calculate the amount of cementite and the content of C therein And thus calculate the amount of solid solution C in the matrix. In this paper, the chemical compositional formula of the cementite in GCr15 steel is preliminarily determined through experiments, which can only analyze the content of Fe element in the chemical analysis so as to improve the work efficiency and achieve the accuracy requirement. On this basis, for quenched and tempered samples, the cementite cementite residue is generally closely attached to the surface of the sample without falling off during the electrolysis, and thus a dry weighing method is proposed, which can be completely dispensed with Residue separation and chemical analysis of two steps to further improve work efficiency.