摘要:
为探究碲元素对303Cu易切削不锈钢中MnS夹杂物形态的影响,向303Cu钢中加入不同质量分数的碲,结合金相显微镜、扫描电镜、小样电解等方法,分析了碲对钢中MnS夹杂物形态及分布的影响。结果表明:在303Cu不锈钢中加入碲,可以减少小尺寸夹杂物的数量,增多大尺寸夹杂物的数量,增大夹杂物平均等效直径和平均面积,加入0.036 0%碲时夹杂物改质效果最好;在低碲钢中碲化物主要附着在MnS表面,高碲钢中形成碲化物完全包裹MnS的复合夹杂;钢中夹杂物经过改质,从链状、长条状变成纺锤状和球状,有利于力学性能和切削性能的改善。加入碲元素后,夹杂物和基体的硬度均先增大后减小,在碲含量为0.018 0%时基体和夹杂物的硬度(HV10)最大,分别为209.6和200.3。
Abstract:
In order to study the influence of tellurium on the morphology of MnS inclusions in 303Cu freecutting stainless steel,various amount of tellurium was added into 303Cu steel,and then the morphology and distribution of MnS inclusions in steels was analyzed by means of OM,SEM and microelectrolysisdding.It was found out that with tellurium addition into 303Cu stainless steel,the number of small-size inclusions in steel decreased,while the number of large-size inclusions increased,and the average equivalent diameter and average area of the inclusions increased. Inclusions modification was achieved the best effect when 0.036 0% tellurium was added.Telluride mainly attached to the surface of MnS inclusions in low-tellurium steel,while MnS inclusions were completely surrounded by telluride in high-tellurium steel.After treated by tellurium,the inclusions in steel were modified from chains and strips into spindles and spheres,which was beneficial to the improvement of mechanical properties and cutting properties.After tellurium was added,the hardness of the inclusion and the matrix firstly increased and then decreased.When the tellurium content was 0.018 0%,the hardness of the matrix and the inclusion reached the maximum values of 209.6 HV10 and 200.3 HV10,respectively.
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