本文用带有石墨单色器的高精度x射线衍射仪(Cu—k_2辐射)研究了马氏体相变。用(311)_A和(211)_M线条测定残余奥氏体,用(002)_M—[(200)_M,(020)_M]线条测定高碳马氏体的碳含量,用(222)_M线条测定低、中碳马氏体的碳含量。实验结果表明,无论是低碳钢,还是高碳钢,马氏体相变时,均有碳的扩散现象。但是,在低碳钢中碳的扩散要比高碳钢中的大得多,合金元素将减慢这种扩散。 In this paper, martensitic transformation was studied by high-precision x-ray diffractometer with graphite monochromator (Cu-k 2 radiation). The retained austenite was measured with (311) _A and (211) _M lines and the carbon content of high carbon martensite was measured with (002) _M - [(200) _M, (020) _M] Line determination of low, carbon carbon martensite content. The experimental results show that, whether it is mild steel, or high carbon steel, martensitic transformation, both carbon diffusion phenomenon. However, the diffusion of carbon in mild steel is much greater than in high-carbon steels, and alloying elements will slow the diffusion.