xldyys
幼苗
共回答了20个问题采纳率:95% 举报
With the increasing of carbon content of ferrite content decreased,pearlite content increased gradually,when the carbon content increases to a certain extent,the pearlite content increased to 100%; carbon content continues to increase,appeared two times cementite,and gradually formed a reticular pattern.
The hardness of steel is mainly composed of carbide decided,with the increasing of carbon content the hardness on the rise; in which there are two steel is special,40Cr joined Cr,likely due to chromium carbides is stable,not easy to grow,so refined grain,the hardness increased,65Mn joined the manganese element,may be due to manganese can strengthen the ferrite,solid solution strengthening effect,its hardness increased significantly,indicating the steel to add some alloy elements can enhance its hardness.
1年前
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