Influence of Carbon Content and Solidification Condition on Incipient Melting of DS Superalloy MAR-M200+2Hf
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG1989年第2期
论文作者：郑运荣 王罗宝 李成功
文章页码：90 - 95
摘 要：<正> Hf lowers the incipient melting temperatureof superalloy. As carbon content in Hf-bearingalloy decreases, the incipient melting temperaturedrops furthey. PD ingots have stronger tendencyto incipient melting than HRS ones. Even thoughin PD ingot, the sensitivities at both endsof the ingot are quite different. The meltingof Ni5Hf phase may be considered as one of themain factors affecting incipient melting. Themore Ni5Hf the alloy contains, the more seriousthe incipient melting becomes. The results ofdifferential thermal analysis （DTA） have provedthat the peak of 1135-1160℃ corresponds tothe melting range or Ni5Hf. By means of apretreatment at 1150℃, 8h, Ni5Hf phase can beeliminated in two ways: the reactionNi5Hf+γ（C）→MC2+γ and solid solution, andtherefore the final solid solution treatmentcan be carried out at 1260℃. This brings abouta high homogenized structure and further increasesthe stress rupture properties of the alloy at1040℃, 140 MPa.
郑运荣，王罗宝，李成功
摘 要：<正> Hf lowers the incipient melting temperatureof superalloy. As carbon content in Hf-bearingalloy decreases, the incipient melting temperaturedrops furthey. PD ingots have stronger tendencyto incipient melting than HRS ones. Even thoughin PD ingot, the sensitivities at both endsof the ingot are quite different. The meltingof Ni5Hf phase may be considered as one of themain factors affecting incipient melting. Themore Ni5Hf the alloy contains, the more seriousthe incipient melting becomes. The results ofdifferential thermal analysis （DTA） have provedthat the peak of 1135-1160℃ corresponds tothe melting range or Ni5Hf. By means of apretreatment at 1150℃, 8h, Ni5Hf phase can beeliminated in two ways: the reactionNi5Hf+γ（C）→MC2+γ and solid solution, andtherefore the final solid solution treatmentcan be carried out at 1260℃. This brings abouta high homogenized structure and further increasesthe stress rupture properties of the alloy at1040℃, 140 MPa.
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