论文部分内容阅读
前言钢中残余奥氏体含量直接影响钢材的性能。生产上常根据使用要求调整其含量,同时也要求准确的测定不同状态下的奥氏体含量。我们采用了M.Cohen法。由于X射线衍射所用的实验条件不统一,如G因子的计算、辐射的选择、仪器参数以及钢样本身状态(如择优取向、晶粒度、碳化物含量等)的差别,使得目前尚无测量残余奥氏体含量的统一标准。各单位测量结果相差很大,无法比较。随着生产发展的需要,几年来我们组织了全国20几个单位分阶段进行了大量实验工作。统一了一些实验条件,对某些因素加以限制。于1982年通过了“钢中残余奥氏体百分含量的测定,X射线衍射测试方法暂行标准草案”(以下简称草案)。根据草案我们进行了全国性巡回试样的测试工作,取得了满意的结果。实验内容 1.X射线衍射仪参数的选择 1.1不同辐射对残余奥氏体测量值有着较大影响。各种辐射实验结果列于表1。从表1可以看出,使用不同辐射得到的V_r％也不相同。用Cr辐射,由于不能测出γ(311)
Preface The residual austenite content in steel directly affects the properties of the steel. Production often adjust the content according to the requirements of use, but also requires accurate determination of austenite content under different conditions. We used the M. Cohen method. The experimental conditions used for X-ray diffraction are not uniform, such as the calculation of G factor, the choice of radiation, the instrument parameters and the difference of the state of the steel sample (such as preferred orientation, grain size, carbide content, etc.) A uniform standard of retained austenite content. The results of various units vary greatly, can not be compared. In the past few years, with the development of production needs, we organized a large number of experimental work carried out in stages in 20 units across the country. Unify a number of experimental conditions, to limit certain factors. In 1982 adopted the “determination of residual austenite content in steel, X-ray diffraction test method Interim Draft Standard” (hereinafter referred to as the draft). According to the draft, we carried out the national tour test samples, and achieved satisfactory results. Experimental content 1. X-ray diffraction parameters of choice 1.1 different radiation on the residual austenite measurements have a greater impact. The results of various radiation experiments are listed in Table 1. It can be seen from Table 1 that V_r% obtained by using different radiation is also different. With Cr radiation, as can not be measured γ (311)